Re: Update GCC to autoconf 2.69, automake 1.15.1

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Re: Update GCC to autoconf 2.69, automake 1.15.1

Richard Biener-2
On Wed, Oct 31, 2018 at 4:26 AM Joseph Myers <[hidden email]> wrote:

>
> This patch (diffs to generated files omitted below) updates GCC to use
> autoconf 2.69 and automake 1.15.1.  (That's not the latest automake
> version, but it's the one used by binutils-gdb, with which consistency
> is desirable, and in any case seems a useful incremental update that
> should make a future update to 1.16.1 easier.)
>
> The changes are generally similar to the binutils-gdb ones, and are
> copied from there where shared files and directories are involved
> (there are some further changes to such shared directories, however,
> which I'd expect to apply to binutils-gdb once this patch is in GCC).
> Largely, obsolete AC_PREREQ calls are removed, while many
> AC_LANG_SOURCE calls are added to avoid warnings from aclocal and
> autoconf.  Multilib support is no longer included in core automake,
> meaning that multilib.am needs copying from automake's contrib
> directory into the GCC source tree.  Autoconf 2.69 has Go support, so
> local copies of that support are removed.  I hope the D support will
> soon be submitted to upstream autoconf so the local copy of that can
> be removed in a future update.
>
> Note that the regeneration did not include regeneration of
> fixincludes/config.h.in (attempting such regeneration resulted in all
> the USED_FOR_TARGET conditionals disappearing; and I don't see
> anything in the fixincludes/ directory that would result in such
> conditionals being generated, unlike in the gcc/ directory).  Also
> note that libvtv/testsuite/other-tests/Makefile.in was not
> regenerated; that directory is not listed as a subdirectory for which
> Makefile.in gets regenerated by calling "automake" in libvtv/, so I'm
> not sure how it's meant to be regenerated.
>
> While I mostly fixed warnings should running aclocal / automake /
> autoconf, there were various such warnings from automake in the
> libgfortran, libgo, libgomp, liboffloadmic, libsanitizer, libphobos
> directories that I did not fix, preferring to leave those to the
> relevant subsystem maintainers.  Specifically, most of those warnings
> were of the following form (example from libgfortran):
>
> Makefile.am:48: warning: source file 'caf/single.c' is in a subdirectory,
> Makefile.am:48: but option 'subdir-objects' is disabled
> automake: warning: possible forward-incompatibility.
> automake: At least a source file is in a subdirectory, but the 'subdir-objects'
> automake: automake option hasn't been enabled.  For now, the corresponding output
> automake: object file(s) will be placed in the top-level directory.  However,
> automake: this behaviour will change in future Automake versions: they
> will
> automake: unconditionally cause object files to be placed in the same subdirectory
> automake: of the corresponding sources.
> automake: You are advised to start using 'subdir-objects' option throughout your
> automake: project, to avoid future incompatibilities.
>
> I think it's best for the relevant maintainers to add subdir-objects
> and do any other associated Makefile.am changes needed.  In some cases
> the paths in the warnings involved ../; I don't know if that adds any
> extra complications to the use of subdir-objects.
>
> I've tested this with native, cross and Canadian cross builds.  The
> risk of any OS-specific issues should I hope be rather lower than if a
> libtool upgrade were included (we *should* do such an upgrade at some
> point, but it's more complicated - it involves identifying all our
> local libtool changes to see if any aren't included in the upstream
> version we update to, and reverting an upstream libtool patch that's
> inappropriate for use in GCC); I think it would be better to get this
> update into GCC so that people can test in different configurations
> and we can fix any issues found, rather than to try to get more and
> more testing done before it goes in.

OK.

Thanks for the work!
Richard.

> top level:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * multilib.am: New file.  From automake.
>
>         Merge from binutils-gdb:
>         2018-06-19  Simon Marchi  <[hidden email]>
>
>         * libtool.m4: Use AC_LANG_SOURCE.
>         * configure.ac: Remove AC_PREREQ, use AC_LANG_SOURCE.
>         * ar-lib: New file.
>         * test-driver: New file.
>         * configure: Re-generate.
>
> config:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * math.m4, tls.m4: Use AC_LANG_SOURCE.
>
>         Merge from binutils-gdb:
>         2018-06-19  Simon Marchi  <[hidden email]>
>
>         * override.m4 (_GCC_AUTOCONF_VERSION): Bump from 2.64 to 2.69.
>
> fixincludes:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.
>         * aclocal.m4, configure: Regenerate.
>
> gcc:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.  Use AC_LANG_SOURCE.  Use single
>         line for second argument of AC_DEFINE_UNQUOTED.
>         * aclocal.m4, config.in, configure: Regenerate.
>
> gnattools:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.
>         * configure: Regenerate.
>
> gotools:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * config/go.m4: Remove file.
>         * Makefile.am (ACLOCAL_AMFLAGS): Do not use -I ./config.
>         * configure.ac:  Remove AC_PREREQ.  Do not include config/go.m4.
>         * Makefile.in, aclocal.m4, configure: Regenerate.
>
> intl:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         Merge from binutils-gdb:
>         2018-06-19  Simon Marchi  <[hidden email]>
>
>         * configure.ac: Add AC_USE_SYSTEM_EXTENSIONS, remove AC_PREREQ.
>         * configure: Re-generate.
>         * config.h.in: Re-generate.
>         * aclocal.m4: Re-generate.
>
> libada:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.
>         * configure: Regenerate.
>
> libatomic:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         * acinclude.m4: Use AC_LANG_SOURCE.
>         * configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, configure, testsuite/Makefile.in:
>         Regenerate.
>
> libbacktrace:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         * configure.ac: Remove AC_PREREQ.  Use AC_LANG_SOURCE.
>         * Makefile.in, aclocal.m4, config.h.in, configure: Regenerate.
>
> libcc1:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, configure: Regenerate.
>
> libcpp:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.  Use AC_LANG_SOURCE.
>         * aclocal.m4, config.in, configure: Regenerate.
>
> libdecnumber:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         Merge from binutils-gdb:
>         2018-06-19  Simon Marchi  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.
>         * configure: Re-generate.
>         * aclocal.m4.
>
> libffi:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         (AUTOMAKE_OPTIONS): Add info-in-builddir.
>         (CLEANFILES): Remove doc/libffi.info.
>         * configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, configure, fficonfig.h.in,
>         include/Makefile.in, man/Makefile.in, testsuite/Makefile.in:
>         Regenerate.
>
> libgcc:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.  Use AC_LANG_SOURCE.
>         * configure: Regenerate.
>
> libgfortran:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         * configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, config.h.in, configure: Regenerate.
>
> libgo:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         * config/go.m4: Remove file.
>         * config/libtool.m4: Use AC_LANG_SOURCE.
>         * configure.ac: Remove AC_PREREQ.  Use AC_LANG_SOURCE.
>         * Makefile.in, aclocal.m4, configure, testsuite/Makefile.in:
>         Regenerate.
>
> libgomp:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am
>         (AUTOMAKE_OPTIONS): Add info-in-builddir.
>         (CLEANFILES): Remove libgomp.info.
>         * configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, configure, testsuite/Makefile.in:
>         Regenerate.
>
> libhsail-rt:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, configure: Regenerate.
>
> libiberty:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         Merge from binutils-gdb:
>         2018-06-19  Simon Marchi  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.
>         * configure: Re-generate.
>         * config.in: Re-generate.
>
> libitm:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         (AUTOMAKE_OPTIONS): Add info-in-builddir.
>         (CLEANFILES): Remove libitm.info.
>         * configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, configure, testsuite/Makefile.in:
>         Regenerate.
>
> libobjc:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.
>         * aclocal.m4, config.h.in, configure: Regenerate.
>
> liboffloadmic:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         * configure.ac: Remove AC_PREREQ.
>         * plugin/Makefile.am: Include multilib.am.
>         * plugin/configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, configure, plugin/Makefile.in,
>         plugin/aclocal.m4, plugin/configure: Regenerate.
>
> libphobos:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         * configure.ac: Remove AC_PREREQ.
>         * m4/autoconf.m4: Add extra argument to AC_LANG_DEFINE call.
>         * m4/druntime/os.m4: Use AC_LANG_SOURCE.
>         * Makefile.in, aclocal.m4, configure, libdruntime/Makefile.in,
>         src/Makefile.in, testsuite/Makefile.in: Regenerate.
>
> libquadmath:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         (AUTOMAKE_OPTIONS): Remove 1.8.  Add info-in-builddir.
>         (all-local): Define outside conditional code.
>         (CLEANFILES): Remove libquadmath.info.
>         * configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, config.h.in, configure: Regenerate.
>
> libsanitizer:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         * configure.ac: Remove AC_PREREQ.  Use AC_LANG_SOURCE.
>         * Makefile.in, aclocal.m4, asan/Makefile.in, config.h.in,
>         configure, interception/Makefile.in, libbacktrace/Makefile.in,
>         lsan/Makefile.in, sanitizer_common/Makefile.in, tsan/Makefile.in,
>         ubsan/Makefile.in: Regenerate.
>
> libssp:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         (AUTOMAKE_OPTIONS): Remove 1.9.5.
>         * configure.ac: Remove AC_PREREQ.  Quote argument to
>         AC_RUN_IFELSE.
>         * Makefile.in, aclocal.m4, configure: Regenerate.
>
> libstdc++-v3:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         * configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, configure, doc/Makefile.in,
>         include/Makefile.in, libsupc++/Makefile.in, po/Makefile.in,
>         python/Makefile.in, src/Makefile.in, src/c++11/Makefile.in,
>         src/c++17/Makefile.in, src/c++98/Makefile.in,
>         src/filesystem/Makefile.in, testsuite/Makefile.in: Regenerate.
>
> libvtv:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>         * configure.ac: Remove AC_PREREQ.
>         * Makefile.in, aclocal.m4, configure, testsuite/Makefile.in:
>         Regenerate.
>
> lto-plugin:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * configure.ac: Remove AC_PREREQ.  Use AC_LANG_SOURCE.
>         * Makefile.in, aclocal.m4, config.h.in, configure: Regenerate.
>
> zlib:
> 2018-10-31  Joseph Myers  <[hidden email]>
>
>         * Makefile.am: Include multilib.am.
>
>         Merge from binutils-gdb:
>         2018-06-19  Simon Marchi  <[hidden email]>
>
>         * configure.ac: Modernize AC_INIT call, remove AC_PREREQ.
>         * Makefile.am (AUTOMAKE_OPTIONS): Remove 1.8, cygnus, add foreign.
>         * Makefile.in: Re-generate.
>         * aclocal.m4: Re-generate.
>         * configure: Re-generate.
>
> Index: ar-lib
> ===================================================================
> --- ar-lib      (nonexistent)
> +++ ar-lib      (working copy)
> @@ -0,0 +1,270 @@
> +#! /bin/sh
> +# Wrapper for Microsoft lib.exe
> +
> +me=ar-lib
> +scriptversion=2012-03-01.08; # UTC
> +
> +# Copyright (C) 2010-2017 Free Software Foundation, Inc.
> +# Written by Peter Rosin <[hidden email]>.
> +#
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License as published by
> +# the Free Software Foundation; either version 2, or (at your option)
> +# any later version.
> +#
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program.  If not, see <http://www.gnu.org/licenses/>.
> +
> +# As a special exception to the GNU General Public License, if you
> +# distribute this file as part of a program that contains a
> +# configuration script generated by Autoconf, you may include it under
> +# the same distribution terms that you use for the rest of that program.
> +
> +# This file is maintained in Automake, please report
> +# bugs to <[hidden email]> or send patches to
> +# <[hidden email]>.
> +
> +
> +# func_error message
> +func_error ()
> +{
> +  echo "$me: $1" 1>&2
> +  exit 1
> +}
> +
> +file_conv=
> +
> +# func_file_conv build_file
> +# Convert a $build file to $host form and store it in $file
> +# Currently only supports Windows hosts.
> +func_file_conv ()
> +{
> +  file=$1
> +  case $file in
> +    / | /[!/]*) # absolute file, and not a UNC file
> +      if test -z "$file_conv"; then
> +       # lazily determine how to convert abs files
> +       case `uname -s` in
> +         MINGW*)
> +           file_conv=mingw
> +           ;;
> +         CYGWIN*)
> +           file_conv=cygwin
> +           ;;
> +         *)
> +           file_conv=wine
> +           ;;
> +       esac
> +      fi
> +      case $file_conv in
> +       mingw)
> +         file=`cmd //C echo "$file " | sed -e 's/"\(.*\) " *$/\1/'`
> +         ;;
> +       cygwin)
> +         file=`cygpath -m "$file" || echo "$file"`
> +         ;;
> +       wine)
> +         file=`winepath -w "$file" || echo "$file"`
> +         ;;
> +      esac
> +      ;;
> +  esac
> +}
> +
> +# func_at_file at_file operation archive
> +# Iterate over all members in AT_FILE performing OPERATION on ARCHIVE
> +# for each of them.
> +# When interpreting the content of the @FILE, do NOT use func_file_conv,
> +# since the user would need to supply preconverted file names to
> +# binutils ar, at least for MinGW.
> +func_at_file ()
> +{
> +  operation=$2
> +  archive=$3
> +  at_file_contents=`cat "$1"`
> +  eval set x "$at_file_contents"
> +  shift
> +
> +  for member
> +  do
> +    $AR -NOLOGO $operation:"$member" "$archive" || exit $?
> +  done
> +}
> +
> +case $1 in
> +  '')
> +     func_error "no command.  Try '$0 --help' for more information."
> +     ;;
> +  -h | --h*)
> +    cat <<EOF
> +Usage: $me [--help] [--version] PROGRAM ACTION ARCHIVE [MEMBER...]
> +
> +Members may be specified in a file named with @FILE.
> +EOF
> +    exit $?
> +    ;;
> +  -v | --v*)
> +    echo "$me, version $scriptversion"
> +    exit $?
> +    ;;
> +esac
> +
> +if test $# -lt 3; then
> +  func_error "you must specify a program, an action and an archive"
> +fi
> +
> +AR=$1
> +shift
> +while :
> +do
> +  if test $# -lt 2; then
> +    func_error "you must specify a program, an action and an archive"
> +  fi
> +  case $1 in
> +    -lib | -LIB \
> +    | -ltcg | -LTCG \
> +    | -machine* | -MACHINE* \
> +    | -subsystem* | -SUBSYSTEM* \
> +    | -verbose | -VERBOSE \
> +    | -wx* | -WX* )
> +      AR="$AR $1"
> +      shift
> +      ;;
> +    *)
> +      action=$1
> +      shift
> +      break
> +      ;;
> +  esac
> +done
> +orig_archive=$1
> +shift
> +func_file_conv "$orig_archive"
> +archive=$file
> +
> +# strip leading dash in $action
> +action=${action#-}
> +
> +delete=
> +extract=
> +list=
> +quick=
> +replace=
> +index=
> +create=
> +
> +while test -n "$action"
> +do
> +  case $action in
> +    d*) delete=yes  ;;
> +    x*) extract=yes ;;
> +    t*) list=yes    ;;
> +    q*) quick=yes   ;;
> +    r*) replace=yes ;;
> +    s*) index=yes   ;;
> +    S*)             ;; # the index is always updated implicitly
> +    c*) create=yes  ;;
> +    u*)             ;; # TODO: don't ignore the update modifier
> +    v*)             ;; # TODO: don't ignore the verbose modifier
> +    *)
> +      func_error "unknown action specified"
> +      ;;
> +  esac
> +  action=${action#?}
> +done
> +
> +case $delete$extract$list$quick$replace,$index in
> +  yes,* | ,yes)
> +    ;;
> +  yesyes*)
> +    func_error "more than one action specified"
> +    ;;
> +  *)
> +    func_error "no action specified"
> +    ;;
> +esac
> +
> +if test -n "$delete"; then
> +  if test ! -f "$orig_archive"; then
> +    func_error "archive not found"
> +  fi
> +  for member
> +  do
> +    case $1 in
> +      @*)
> +        func_at_file "${1#@}" -REMOVE "$archive"
> +        ;;
> +      *)
> +        func_file_conv "$1"
> +        $AR -NOLOGO -REMOVE:"$file" "$archive" || exit $?
> +        ;;
> +    esac
> +  done
> +
> +elif test -n "$extract"; then
> +  if test ! -f "$orig_archive"; then
> +    func_error "archive not found"
> +  fi
> +  if test $# -gt 0; then
> +    for member
> +    do
> +      case $1 in
> +        @*)
> +          func_at_file "${1#@}" -EXTRACT "$archive"
> +          ;;
> +        *)
> +          func_file_conv "$1"
> +          $AR -NOLOGO -EXTRACT:"$file" "$archive" || exit $?
> +          ;;
> +      esac
> +    done
> +  else
> +    $AR -NOLOGO -LIST "$archive" | sed -e 's/\\/\\\\/g' | while read member
> +    do
> +      $AR -NOLOGO -EXTRACT:"$member" "$archive" || exit $?
> +    done
> +  fi
> +
> +elif test -n "$quick$replace"; then
> +  if test ! -f "$orig_archive"; then
> +    if test -z "$create"; then
> +      echo "$me: creating $orig_archive"
> +    fi
> +    orig_archive=
> +  else
> +    orig_archive=$archive
> +  fi
> +
> +  for member
> +  do
> +    case $1 in
> +    @*)
> +      func_file_conv "${1#@}"
> +      set x "$@" "@$file"
> +      ;;
> +    *)
> +      func_file_conv "$1"
> +      set x "$@" "$file"
> +      ;;
> +    esac
> +    shift
> +    shift
> +  done
> +
> +  if test -n "$orig_archive"; then
> +    $AR -NOLOGO -OUT:"$archive" "$orig_archive" "$@" || exit $?
> +  else
> +    $AR -NOLOGO -OUT:"$archive" "$@" || exit $?
> +  fi
> +
> +elif test -n "$list"; then
> +  if test ! -f "$orig_archive"; then
> +    func_error "archive not found"
> +  fi
> +  $AR -NOLOGO -LIST "$archive" || exit $?
> +fi
>
> Property changes on: ar-lib
> ___________________________________________________________________
> Added: svn:executable
> ## -0,0 +1 ##
> +*
> \ No newline at end of property
> Index: config/math.m4
> ===================================================================
> --- config/math.m4      (revision 265631)
> +++ config/math.m4      (working copy)
> @@ -25,7 +25,7 @@
>    AC_REQUIRE([GCC_CHECK_LIBM])
>    AC_REQUIRE([GCC_CHECK_MATH_HEADERS])
>    AC_CACHE_CHECK([for $1], [gcc_cv_math_func_$1],
> -                [AC_LINK_IFELSE([
> +                [AC_LINK_IFELSE([AC_LANG_SOURCE([
>  #ifdef HAVE_COMPLEX_H
>  #include <complex.h>
>  #endif
> @@ -40,7 +40,7 @@
>  {
>    return 0;
>  }
> -],
> +])],
>  [gcc_cv_math_func_$1=yes],
>  [gcc_cv_math_func_$1=no])])
>    if test $gcc_cv_math_func_$1 = yes; then
> Index: config/override.m4
> ===================================================================
> --- config/override.m4  (revision 265631)
> +++ config/override.m4  (working copy)
> @@ -29,7 +29,7 @@
>
>  dnl Ensure exactly this Autoconf version is used
>  m4_ifndef([_GCC_AUTOCONF_VERSION],
> -  [m4_define([_GCC_AUTOCONF_VERSION], [2.64])])
> +  [m4_define([_GCC_AUTOCONF_VERSION], [2.69])])
>
>  dnl Test for the exact version when AC_INIT is expanded.
>  dnl This allows to update the tree in steps (for testing)
> Index: config/tls.m4
> ===================================================================
> --- config/tls.m4       (revision 265631)
> +++ config/tls.m4       (working copy)
> @@ -4,14 +4,14 @@
>    GCC_ENABLE(tls, yes, [], [Use thread-local storage])
>    AC_CACHE_CHECK([whether the target supports thread-local storage],
>                  gcc_cv_have_tls, [
> -    AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
> +    AC_RUN_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])],
>        [dnl If the test case passed with dynamic linking, try again with
>         dnl static linking, but only if static linking is supported (not
>         dnl on Solaris 10).  This fails with some older Red Hat releases.
>        chktls_save_LDFLAGS="$LDFLAGS"
>        LDFLAGS="-static $LDFLAGS"
> -      AC_LINK_IFELSE([int main() { return 0; }],
> -       [AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
> +      AC_LINK_IFELSE([AC_LANG_SOURCE([int main() { return 0; }])],
> +       [AC_RUN_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])],
>                        [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no],[])],
>         [gcc_cv_have_tls=yes])
>        LDFLAGS="$chktls_save_LDFLAGS"
> @@ -71,7 +71,7 @@
>        [gcc_cv_have_tls=no],
>        [dnl This is the cross-compiling case. Assume libc supports TLS if the
>         dnl binutils and the compiler do.
> -       AC_LINK_IFELSE([__thread int a; int b; int main() { return a = b; }],
> +       AC_LINK_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])],
>          [chktls_save_LDFLAGS="$LDFLAGS"
>           dnl Shared library options may depend on the host; this check
>           dnl is only known to be needed for GNU/Linux.
> @@ -83,8 +83,8 @@
>           chktls_save_CFLAGS="$CFLAGS"
>           CFLAGS="-fPIC $CFLAGS"
>           dnl If -shared works, test if TLS works in a shared library.
> -         AC_LINK_IFELSE([int f() { return 0; }],
> -           [AC_LINK_IFELSE([__thread int a; int b; int f() { return a = b; }],
> +         AC_LINK_IFELSE([AC_LANG_SOURCE([int f() { return 0; }])],
> +           [AC_LINK_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int f() { return a = b; }])],
>               [gcc_cv_have_tls=yes],
>               [gcc_cv_have_tls=no])],
>             [gcc_cv_have_tls=yes])
> @@ -102,7 +102,7 @@
>    GCC_ENABLE(tls, yes, [], [Use thread-local storage])
>    AC_CACHE_CHECK([whether the target assembler supports thread-local storage],
>                  gcc_cv_have_cc_tls, [
> -    AC_COMPILE_IFELSE([__thread int a; int b; int main() { return a = b; }],
> +    AC_COMPILE_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])],
>        [gcc_cv_have_cc_tls=yes], [gcc_cv_have_cc_tls=no])]
>      )])
>    if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
> Index: configure.ac
> ===================================================================
> --- configure.ac        (revision 265631)
> +++ configure.ac        (working copy)
> @@ -31,7 +31,6 @@
>  m4_include([config/isl.m4])
>
>  AC_INIT(move-if-change)
> -AC_PREREQ(2.64)
>  AC_DISABLE_OPTION_CHECKING
>
>  progname=$0
> @@ -1289,11 +1288,11 @@
>    LDFLAGS="$LDFLAGS -static-libstdc++ -static-libgcc"
>    AC_MSG_CHECKING([whether g++ accepts -static-libstdc++ -static-libgcc])
>    AC_LANG_PUSH(C++)
> -  AC_LINK_IFELSE([
> +  AC_LINK_IFELSE([AC_LANG_SOURCE([
>  #if (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 5)
>  #error -static-libstdc++ not implemented
>  #endif
> -int main() {}],
> +int main() {}])],
>      [AC_MSG_RESULT([yes]); have_static_libs=yes],
>      [AC_MSG_RESULT([no])])
>    AC_LANG_POP(C++)
> Index: fixincludes/configure.ac
> ===================================================================
> --- fixincludes/configure.ac    (revision 265631)
> +++ fixincludes/configure.ac    (working copy)
> @@ -1,4 +1,3 @@
> -AC_PREREQ(2.64)
>
>  AC_INIT(fixincludes, [ ])
>  AC_CONFIG_SRCDIR(inclhack.def)
> Index: gcc/configure.ac
> ===================================================================
> --- gcc/configure.ac    (revision 265631)
> +++ gcc/configure.ac    (working copy)
> @@ -23,7 +23,6 @@
>  # Initialization and sanity checks
>  # --------------------------------
>
> -AC_PREREQ(2.64)
>  AC_INIT
>  AC_CONFIG_SRCDIR(tree.c)
>  AC_CONFIG_HEADER(auto-host.h:config.in)
> @@ -450,11 +449,11 @@
>    # -fno-strict-aliasing *and* is older than GCC 4.3.
>    CXXFLAGS="$CXXFLAGS -fno-strict-aliasing"
>    AC_MSG_CHECKING([whether $CXX is affected by placement new aliasing bug])
> -  AC_COMPILE_IFELSE([
> +  AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
>  #error compiler not affected by placement new aliasing bug
>  #endif
> -],
> +])],
>      [AC_MSG_RESULT([yes]); aliasing_flags='-fno-strict-aliasing'],
>      [AC_MSG_RESULT([no])])
>
> @@ -1611,12 +1610,12 @@
>    powerpc*-*-darwin*)
>      AC_CACHE_CHECK([whether mcontext_t fields have underscores],
>        gcc_cv_mcontext_underscores,
> -      AC_COMPILE_IFELSE([
> +      AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #include <sys/cdefs.h>
>  #include <sys/signal.h>
>  #include <ucontext.h>
>  int main() { mcontext_t m; if (m->ss.srr0) return 0; return 0; }
> -],
> +])],
>         gcc_cv_mcontext_underscores=no, gcc_cv_mcontext_underscores=yes))
>        if test $gcc_cv_mcontext_underscores = yes; then
>          AC_DEFINE(HAS_MCONTEXT_T_UNDERSCORES,,dnl
> @@ -2904,8 +2903,7 @@
>         .cfi_personality 0, symbol
>         .cfi_endproc])
>  AC_DEFINE_UNQUOTED(HAVE_GAS_CFI_PERSONALITY_DIRECTIVE,
> -  [`if test $gcc_cv_as_cfi_personality_directive = yes;
> -    then echo 1; else echo 0; fi`],
> +  [`if test $gcc_cv_as_cfi_personality_directive = yes; then echo 1; else echo 0; fi`],
>    [Define 0/1 if your assembler supports .cfi_personality.])
>
>  gcc_GAS_CHECK_FEATURE([cfi sections directive],
> @@ -2932,8 +2930,7 @@
>  esac])
>  GCC_TARGET_TEMPLATE(HAVE_GAS_CFI_SECTIONS_DIRECTIVE)
>  AC_DEFINE_UNQUOTED(HAVE_GAS_CFI_SECTIONS_DIRECTIVE,
> -  [`if test $gcc_cv_as_cfi_sections_directive = yes;
> -    then echo 1; else echo 0; fi`],
> +  [`if test $gcc_cv_as_cfi_sections_directive = yes; then echo 1; else echo 0; fi`],
>    [Define 0/1 if your assembler supports .cfi_sections.])
>
>  # GAS versions up to and including 2.11.0 may mis-optimize
> @@ -5537,7 +5534,7 @@
>  saved_LDFLAGS="$LDFLAGS"
>  for clearcap_map in sol2-clearcapv2.map sol2-clearcap.map; do
>    LDFLAGS="$saved_LDFLAGS -Wl,-M,${srcdir}/config/$clearcap_map"
> -  AC_LINK_IFELSE([int main(void) {return 0;}],
> +  AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) {return 0;}])],
>      [gcc_cv_ld_clearcap=yes; break], [gcc_cv_ld_clearcap=no])
>  done
>  LDFLAGS="$saved_LDFLAGS"
> @@ -6505,7 +6502,7 @@
>    [gcc_cv_c_no_fpie],
>    [saved_CXXFLAGS="$CXXFLAGS"
>     CXXFLAGS="$CXXFLAGS -fno-PIE"
> -   AC_COMPILE_IFELSE([int main(void) {return 0;}],
> +   AC_COMPILE_IFELSE([AC_LANG_SOURCE([int main(void) {return 0;}])],
>       [gcc_cv_c_no_fpie=yes],
>       [gcc_cv_c_no_fpie=no])
>     CXXFLAGS="$saved_CXXFLAGS"])
> @@ -6519,7 +6516,7 @@
>    [gcc_cv_no_pie],
>    [saved_LDFLAGS="$LDFLAGS"
>     LDFLAGS="$LDFLAGS -no-pie"
> -   AC_LINK_IFELSE([int main(void) {return 0;}],
> +   AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) {return 0;}])],
>       [gcc_cv_no_pie=yes],
>       [gcc_cv_no_pie=no])
>     LDFLAGS="$saved_LDFLAGS"])
> Index: gnattools/configure.ac
> ===================================================================
> --- gnattools/configure.ac      (revision 265631)
> +++ gnattools/configure.ac      (working copy)
> @@ -19,7 +19,6 @@
>  sinclude(../config/override.m4)
>
>  AC_INIT
> -AC_PREREQ([2.64])
>
>  AC_CONFIG_SRCDIR([Makefile.in])
>
> Index: gotools/Makefile.am
> ===================================================================
> --- gotools/Makefile.am (revision 265631)
> +++ gotools/Makefile.am (working copy)
> @@ -15,7 +15,7 @@
>  # along with this program; see the file COPYING3.  If not see
>  # <http://www.gnu.org/licenses/>.
>
> -ACLOCAL_AMFLAGS = -I ./config -I ../config
> +ACLOCAL_AMFLAGS = -I ../config
>
>  gcc_version := $(shell $(GCC_FOR_TARGET) -dumpversion)
>
> Index: gotools/config/go.m4
> ===================================================================
> --- gotools/config/go.m4        (revision 265631)
> +++ gotools/config/go.m4        (nonexistent)
> @@ -1,92 +0,0 @@
> -dnl acinclude.m4 -- configure macros
> -
> -dnl Copyright 2009 The Go Authors. All rights reserved.
> -dnl Use of this source code is governed by a BSD-style
> -dnl license that can be found in the LICENSE file.
> -
> -dnl Go support--this could be in autoconf.
> -dnl This version is probably autoconf 2.64 specific.
> -
> -AC_LANG_DEFINE([Go], [go], [GO], [],
> -[ac_ext=go
> -ac_compile='$GOC -c $GOCFLAGS conftest.$ac_ext >&AS_MESSAGE_LOG_FD'
> -ac_link='$GOC -o conftest$ac_exeext $GOCFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&AS_MESSAGE_LOG_FD'
> -ac_compile_gnu=yes
> -])
> -
> -AU_DEFUN([AC_LANG_GO], [AC_LANG(Go)])
> -
> -m4_define([AC_LANG_PROGRAM(Go)],
> -[package main
> -$1
> -func main() {
> -$2
> -}])
> -
> -m4_define([_AC_LANG_IO_PROGRAM(Go)],
> -[AC_LANG_PROGRAM([import "os"],
> -[if f, err := os.Create("conftest.out"), err != nil {
> -       os.Exit(1);
> - }
> - if err := f.Close(); err != nil {
> -       os.Exit(1);
> - }
> - os.Exit(0);
> -])])
> -
> -m4_define([AC_LANG_CALL(Go)],
> -[AC_LANG_PROGRAM([$1
> -m4_if([$2], [main], ,
> -[func $2();])],[$2();])])
> -
> -m4_define([AC_LANG_FUNC_LINK_TRY(Go)],
> -[AC_LANG_PROGRAM(
> -[func $1() int;
> -var f := $1;
> -], [return f();])])
> -
> -m4_define([AC_LANG_BOOL_COMPILE_TRY(Go)],
> -[AC_LANG_PROGRAM([$1], [var test_array @<:@1 - 2 * !($2)@:>@;
> -test_array @<:@0@:>@ = 0
> -])])
> -
> -m4_define([AC_LANG_INT_SAVE(Go)],
> -[AC_LANG_PROGRAM([$1
> -import os
> -func longval() long { return $2 }
> -func ulongval() ulong { return $2 }],
> -[panic("unimplemented")])])
> -
> -AC_DEFUN([AC_LANG_COMPILER(Go)],
> -[AC_REQUIRE([AC_PROG_GO])])
> -
> -AN_MAKEVAR([GOC], [AC_PROG_GO])
> -AN_PROGRAM([gccgo], [AC_PROG_GO])
> -AC_DEFUN([AC_PROG_GO],
> -[AC_LANG_PUSH(Go)dnl
> -AC_ARG_VAR([GOC],   [Go compiler command])dnl
> -AC_ARG_VAR([GOCFLAGS], [Go compiler flags])dnl
> -_AC_ARG_VAR_LDFLAGS()dnl
> -m4_ifval([$1],
> -      [AC_CHECK_TOOLS(GOC, [$1])],
> -[AC_CHECK_TOOL(GOC, gccgo)
> -if test -z "$GOC"; then
> -  if test -n "$ac_tool_prefix"; then
> -    AC_CHECK_PROG(GOC, [${ac_tool_prefix}gccgo], [$ac_tool_prefix}gccgo])
> -  fi
> -fi
> -if test -z "$GOC"; then
> -  AC_CHECK_PROG(GOC, gccgo, gccgo, , , gccgo)
> -fi
> -])
> -
> -# Provide some information about the compiler.
> -_AS_ECHO_LOG([checking for _AC_LANG compiler version])
> -set X $ac_compile
> -ac_compiler=$[2]
> -_AC_DO_LIMIT([$ac_compiler --version >&AS_MESSAGE_LOG_FD])
> -m4_expand_once([_AC_COMPILER_EXEEXT])[]dnl
> -m4_expand_once([_AC_COMPILER_OBJEXT])[]dnl
> -GOCFLAGS="-g -O2"
> -AC_LANG_POP(Go)dnl
> -])# AC_PROG_GO
> Index: gotools/configure.ac
> ===================================================================
> --- gotools/configure.ac        (revision 265631)
> +++ gotools/configure.ac        (working copy)
> @@ -16,11 +16,8 @@
>  # <http://www.gnu.org/licenses/>.
>
>  AC_INIT(package-unused, version-unused,, gotools)
> -AC_PREREQ(2.64)
>  AC_CONFIG_SRCDIR(Makefile.am)
>
> -m4_include([config/go.m4])
> -
>  # Determine the noncanonical names used for directories.
>  ACX_NONCANONICAL_BUILD
>  ACX_NONCANONICAL_HOST
> Index: intl/configure.ac
> ===================================================================
> --- intl/configure.ac   (revision 265631)
> +++ intl/configure.ac   (working copy)
> @@ -1,5 +1,5 @@
> -AC_PREREQ(2.64)
>  AC_INIT
> +AC_USE_SYSTEM_EXTENSIONS
>  AC_CONFIG_SRCDIR(gettext.c)
>  AC_CONFIG_HEADER(config.h)
>  AC_CONFIG_MACRO_DIR(../config)
> Index: libada/configure.ac
> ===================================================================
> --- libada/configure.ac (revision 265631)
> +++ libada/configure.ac (working copy)
> @@ -22,7 +22,6 @@
>  sinclude(../config/unwind_ipinfo.m4)
>
>  AC_INIT
> -AC_PREREQ([2.64])
>
>  AC_CONFIG_SRCDIR([Makefile.in])
>
> Index: libatomic/Makefile.am
> ===================================================================
> --- libatomic/Makefile.am       (revision 265631)
> +++ libatomic/Makefile.am       (working copy)
> @@ -150,3 +150,5 @@
>  # when it is reloaded during the build of all-multi.
>  all-multi: $(libatomic_la_LIBADD)
>         $(MULTIDO) $(AM_MAKEFLAGS) DO=all multi-do # $(MAKE)
> +
> +include $(top_srcdir)/../multilib.am
> Index: libatomic/acinclude.m4
> ===================================================================
> --- libatomic/acinclude.m4      (revision 265631)
> +++ libatomic/acinclude.m4      (working copy)
> @@ -25,7 +25,7 @@
>  dnl
>  AC_DEFUN([LIBAT_HAVE_INT_MODE],[
>    AC_CACHE_CHECK([for $2 byte integer],[libat_cv_have_mode_$1],
> -    [AC_COMPILE_IFELSE([int x __attribute__((mode($1)));],
> +    [AC_COMPILE_IFELSE([AC_LANG_SOURCE([int x __attribute__((mode($1)));])],
>        [libat_cv_have_mode_$1=yes],[libat_cv_have_mode_$1=no])])
>    LIBAT_DEFINE_YESNO([HAVE_INT$2], [$libat_cv_have_mode_$1],
>        [Have support for $2 byte integers.])
> Index: libatomic/configure.ac
> ===================================================================
> --- libatomic/configure.ac      (revision 265631)
> +++ libatomic/configure.ac      (working copy)
> @@ -22,7 +22,6 @@
>  #  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
>  #  <http://www.gnu.org/licenses/>.
>
> -AC_PREREQ(2.59)
>  AC_INIT([GNU Atomic Library], 1.0,,[libatomic])
>  AC_CONFIG_HEADER(auto-config.h)
>
> Index: libbacktrace/Makefile.am
> ===================================================================
> --- libbacktrace/Makefile.am    (revision 265631)
> +++ libbacktrace/Makefile.am    (working copy)
> @@ -195,3 +195,4 @@
>  unknown.lo: config.h backtrace.h internal.h
>  xcoff.lo: config.h backtrace.h internal.h
>
> +include $(top_srcdir)/../multilib.am
> Index: libbacktrace/configure.ac
> ===================================================================
> --- libbacktrace/configure.ac   (revision 265631)
> +++ libbacktrace/configure.ac   (working copy)
> @@ -29,7 +29,6 @@
>  # IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
>  # POSSIBILITY OF SUCH DAMAGE.
>
> -AC_PREREQ(2.64)
>  AC_INIT(package-unused, version-unused,, libbacktrace)
>  AC_CONFIG_SRCDIR(backtrace.h)
>  AC_CONFIG_HEADER(config.h)
> @@ -305,12 +304,12 @@
>    ALLOC_FILE=alloc.lo
>  else
>    VIEW_FILE=mmapio.lo
> -  AC_PREPROC_IFELSE([
> +  AC_PREPROC_IFELSE([AC_LANG_SOURCE([
>  #include <sys/mman.h>
>  #if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
>    #error no MAP_ANONYMOUS
>  #endif
> -], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
> +])], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
>  fi
>  AC_SUBST(VIEW_FILE)
>  AC_SUBST(ALLOC_FILE)
> @@ -414,7 +413,7 @@
>  [libgo_cv_lib_pthread],
>  [CFLAGS_hold=$CFLAGS
>  CFLAGS="$CFLAGS -pthread"
> -AC_COMPILE_IFELSE([[int i;]],
> +AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
>  [libgo_cv_lib_pthread=yes],
>  [libgo_cv_lib_pthread=no])
>  CFLAGS=$CFLAGS_hold])
> Index: libcc1/configure.ac
> ===================================================================
> --- libcc1/configure.ac (revision 265631)
> +++ libcc1/configure.ac (working copy)
> @@ -16,7 +16,6 @@
>  dnl along with GCC; see the file COPYING3.  If not see
>  dnl <http://www.gnu.org/licenses/>.
>
> -AC_PREREQ(2.64)
>  AC_INIT([libcc1], [version-unused])
>  AC_CONFIG_SRCDIR([libcc1.cc])
>  AC_CONFIG_HEADER(cc1plugin-config.h)
> Index: libcpp/configure.ac
> ===================================================================
> --- libcpp/configure.ac (revision 265631)
> +++ libcpp/configure.ac (working copy)
> @@ -1,7 +1,6 @@
>  #                                               -*- Autoconf -*-
>  # Process this file with autoconf to produce a configure script.
>
> -AC_PREREQ(2.64)
>  AC_INIT(cpplib, [ ], [hidden email], cpplib)
>  AC_CONFIG_SRCDIR(ucnid.h)
>  AC_CONFIG_MACRO_DIR(../config)
> @@ -42,7 +41,7 @@
>  # Dependency checking.
>  ZW_CREATE_DEPDIR
>  AC_LANG_PUSH([C++])
> -AC_COMPILE_IFELSE([[int i;]], [],
> +AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])], [],
>                   [AC_MSG_ERROR([C++ compiler missing or inoperational])])
>  AC_LANG_POP([C++])
>  ZW_PROG_COMPILER_DEPENDENCIES([CXX])
> Index: libdecnumber/configure.ac
> ===================================================================
> --- libdecnumber/configure.ac   (revision 265631)
> +++ libdecnumber/configure.ac   (working copy)
> @@ -19,7 +19,6 @@
>  # along with GCC; see the file COPYING3.  If not see
>  # <http://www.gnu.org/licenses/>.
>
> -AC_PREREQ(2.64)
>  AC_INIT(libdecnumber, [ ], [hidden email], libdecnumber)
>  AC_CONFIG_SRCDIR(decNumber.h)
>  AC_CONFIG_MACRO_DIR(../config)
> Index: libffi/Makefile.am
> ===================================================================
> --- libffi/Makefile.am  (revision 265631)
> +++ libffi/Makefile.am  (working copy)
> @@ -1,6 +1,6 @@
>  ## Process this with automake to create Makefile.in
>
> -AUTOMAKE_OPTIONS = foreign subdir-objects
> +AUTOMAKE_OPTIONS = foreign subdir-objects info-in-builddir
>
>  ACLOCAL_AMFLAGS = -I .. -I ../config
>
> @@ -52,7 +52,7 @@
>         $(MAKEINFO) $(AM_MAKEINFOFLAGS) $(MAKEINFOFLAGS) -I $(srcdir)/doc -o doc/libffi.info $(srcdir)/doc/libffi.texi
>         @touch $@
>
> -CLEANFILES = $(STAMP_GENINSRC) $(STAMP_BUILD_INFO) doc/libffi.info
> +CLEANFILES = $(STAMP_GENINSRC) $(STAMP_BUILD_INFO)
>  MAINTAINERCLEANFILES = $(srcdir)/doc/libffi.info
>
>  ## ################################################################
> @@ -243,3 +243,5 @@
>  clean-recursive: clean-multi
>  distclean-recursive: distclean-multi
>  maintainer-clean-recursive: maintainer-clean-multi
> +
> +include $(top_srcdir)/../multilib.am
> Index: libffi/configure.ac
> ===================================================================
> --- libffi/configure.ac (revision 265631)
> +++ libffi/configure.ac (working copy)
> @@ -1,6 +1,5 @@
>  dnl Process this with autoconf to create configure
>
> -AC_PREREQ(2.64)
>
>  AC_INIT([libffi], [3.99999], [http://github.com/atgreen/libffi/issues])
>  AC_CONFIG_HEADERS([fficonfig.h])
> Index: libgcc/configure.ac
> ===================================================================
> --- libgcc/configure.ac (revision 265631)
> +++ libgcc/configure.ac (working copy)
> @@ -13,7 +13,6 @@
>  sinclude(../config/sjlj.m4)
>  sinclude(../config/cet.m4)
>
> -AC_PREREQ(2.64)
>  AC_INIT([GNU C Runtime Library], 1.0,,[libgcc])
>  AC_CONFIG_SRCDIR([static-object.mk])
>
> @@ -229,7 +228,8 @@
>
>  # Check for fixed-point support.
>  AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point],
> -              [AC_COMPILE_IFELSE([_Sat _Fract x;], [libgcc_cv_fixed_point=yes],
> +              [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_Sat _Fract x;])],
> +                                 [libgcc_cv_fixed_point=yes],
>                                   [libgcc_cv_fixed_point=no])])
>  fixed_point=$libgcc_cv_fixed_point
>  AC_SUBST(fixed_point)
> @@ -270,11 +270,11 @@
>  # Check for assembler CFI support.
>  AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
>                [AC_COMPILE_IFELSE(
> -[asm("\n\
> +[AC_LANG_SOURCE([asm("\n\
>         .text\n\
>         .cfi_startproc\n\
>         .cfi_personality 0, symbol\n\
> -       .cfi_endproc");],
> +       .cfi_endproc");])],
>    [libgcc_cv_cfi=yes],
>    [libgcc_cv_cfi=no])])
>
> @@ -296,9 +296,10 @@
>    AC_CACHE_CHECK([whether the target is hard-float],
>                  [libgcc_cv_mips_hard_float],
>                  [AC_COMPILE_IFELSE(
> -    [#ifndef __mips_hard_float
> +    [AC_LANG_SOURCE([#ifndef __mips_hard_float
>       #error FOO
> -     #endif],
> +     #endif
> +    ])],
>      [libgcc_cv_mips_hard_float=yes],
>      [libgcc_cv_mips_hard_float=no])])
>  esac
> @@ -395,7 +396,7 @@
>    AC_CACHE_CHECK([for PowerPC ISA 2.06 to build __float128 libraries],
>                  [libgcc_cv_powerpc_float128],
>                  [AC_COMPILE_IFELSE(
> -    [vector double dadd (vector double a, vector double b) { return a + b; }],
> +    [AC_LANG_SOURCE([vector double dadd (vector double a, vector double b) { return a + b; }])],
>      [libgcc_cv_powerpc_float128=yes],
>      [libgcc_cv_powerpc_float128=no])])
>
> @@ -403,7 +404,7 @@
>    AC_CACHE_CHECK([for PowerPC ISA 3.0 to build hardware __float128 libraries],
>                  [libgcc_cv_powerpc_float128_hw],
>                  [AC_COMPILE_IFELSE(
> -    [#include <sys/auxv.h>
> +    [AC_LANG_SOURCE([#include <sys/auxv.h>
>       #ifndef AT_PLATFORM
>       #error "AT_PLATFORM is not defined"
>       #endif
> @@ -418,7 +419,7 @@
>       }
>       void *add_resolver (void) { return (void *) add; }
>       __float128 add_ifunc (__float128, __float128)
> -       __attribute__ ((__ifunc__ ("add_resolver")));],
> +       __attribute__ ((__ifunc__ ("add_resolver")));])],
>      [libgcc_cv_powerpc_float128_hw=yes],
>      [libgcc_cv_powerpc_float128_hw=no])])
>    CFLAGS="$saved_CFLAGS"
> Index: libgfortran/Makefile.am
> ===================================================================
> --- libgfortran/Makefile.am     (revision 265631)
> +++ libgfortran/Makefile.am     (working copy)
> @@ -1223,3 +1223,5 @@
>  endif
>
>  EXTRA_DIST = $(m4_files)
> +
> +include $(top_srcdir)/../multilib.am
> Index: libgfortran/configure.ac
> ===================================================================
> --- libgfortran/configure.ac    (revision 265631)
> +++ libgfortran/configure.ac    (working copy)
> @@ -1,7 +1,6 @@
>  # Process this file with autoconf to produce a configure script, like so:
>  # aclocal && autoconf && autoheader && automake
>
> -AC_PREREQ(2.64)
>  AC_INIT([GNU Fortran Runtime Library], 0.3,,[libgfortran])
>  AC_CONFIG_HEADER(config.h)
>  GCC_TOPLEV_SUBDIRS
> Index: libgo/Makefile.am
> ===================================================================
> --- libgo/Makefile.am   (revision 265631)
> +++ libgo/Makefile.am   (working copy)
> @@ -1224,3 +1224,5 @@
>
>  distclean-local:
>         find . -name '*.lo.dep' -print | xargs rm -f
> +
> +include $(top_srcdir)/../multilib.am
> Index: libgo/config/go.m4
> ===================================================================
> --- libgo/config/go.m4  (revision 265631)
> +++ libgo/config/go.m4  (nonexistent)
> @@ -1,92 +0,0 @@
> -dnl acinclude.m4 -- configure macros
> -
> -dnl Copyright 2009 The Go Authors. All rights reserved.
> -dnl Use of this source code is governed by a BSD-style
> -dnl license that can be found in the LICENSE file.
> -
> -dnl Go support--this could be in autoconf.
> -dnl This version is probably autoconf 2.64 specific.
> -
> -AC_LANG_DEFINE([Go], [go], [GO], [],
> -[ac_ext=go
> -ac_compile='$GOC -c $GOCFLAGS conftest.$ac_ext >&AS_MESSAGE_LOG_FD'
> -ac_link='$GOC -o conftest$ac_exeext $GOCFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&AS_MESSAGE_LOG_FD'
> -ac_compile_gnu=yes
> -])
> -
> -AU_DEFUN([AC_LANG_GO], [AC_LANG(Go)])
> -
> -m4_define([AC_LANG_PROGRAM(Go)],
> -[package main
> -$1
> -func main() {
> -$2
> -}])
> -
> -m4_define([AC_LANG_IO_PROGRAM(Go)],
> -[AC_LANG_PROGRAM([import "os"],
> -[if f, err := os.Open("conftest.out", os.O_WRONLY), err != nil {
> -       os.Exit(1);
> - }
> - if err := f.Close(); err != nil {
> -       os.Exit(1);
> - }
> - os.Exit(0);
> -])])
> -
> -m4_define([AC_LANG_CALL(Go)],
> -[AC_LANG_PROGRAM([$1
> -m4_if([$2], [main], ,
> -[func $2();])],[$2();])])
> -
> -m4_define([AC_LANG_FUNC_LINK_TRY(Go)],
> -[AC_LANG_PROGRAM(
> -[func $1() int;
> -var f := $1;
> -], [return f();])])
> -
> -m4_define([AC_LANG_BOOL_COMPILE_TRY(Go)],
> -[AC_LANG_PROGRAM([$1], [var test_array @<:@1 - 2 * !($2)@:>@;
> -test_array @<:@0@:>@ = 0
> -])])
> -
> -m4_define([AC_LANG_INT_SAVE(Go)],
> -[AC_LANG_PROGRAM([$1
> -import os
> -func longval() long { return $2 }
> -func ulongval() ulong { return $2 }],
> -[panic("unimplemented")])])
> -
> -AC_DEFUN([AC_LANG_COMPILER(Go)],
> -[AC_REQUIRE([AC_PROG_GO])])
> -
> -AN_MAKEVAR([GOC], [AC_PROG_GO])
> -AN_PROGRAM([gccgo], [AC_PROG_GO])
> -AC_DEFUN([AC_PROG_GO],
> -[AC_LANG_PUSH(Go)dnl
> -AC_ARG_VAR([GOC],   [Go compiler command])dnl
> -AC_ARG_VAR([GOCFLAGS], [Go compiler flags])dnl
> -_AC_ARG_VAR_LDFLAGS()dnl
> -m4_ifval([$1],
> -      [AC_CHECK_TOOLS(GOC, [$1])],
> -[AC_CHECK_TOOL(GOC, gccgo)
> -if test -z "$GOC"; then
> -  if test -n "$ac_tool_prefix"; then
> -    AC_CHECK_PROG(GOC, [${ac_tool_prefix}gccgo], [$ac_tool_prefix}gccgo])
> -  fi
> -fi
> -if test -z "$GOC"; then
> -  AC_CHECK_PROG(GOC, gccgo, gccgo, , , gccgo)
> -fi
> -])
> -
> -# Provide some information about the compiler.
> -_AS_ECHO_LOG([checking for _AC_LANG compiler version])
> -set X $ac_compile
> -ac_compiler=$[2]
> -_AC_DO_LIMIT([$ac_compiler --version >&AS_MESSAGE_LOG_FD])
> -m4_expand_once([_AC_COMPILER_EXEEXT])[]dnl
> -m4_expand_once([_AC_COMPILER_OBJEXT])[]dnl
> -GOCFLAGS="-g -O2"
> -AC_LANG_POP(Go)dnl
> -])# AC_PROG_GO
> Index: libgo/config/libtool.m4
> ===================================================================
> --- libgo/config/libtool.m4     (revision 265631)
> +++ libgo/config/libtool.m4     (working copy)
> @@ -1084,7 +1084,7 @@
>  # to the aix ld manual.
>  m4_defun([_LT_SYS_MODULE_PATH_AIX],
>  [m4_require([_LT_DECL_SED])dnl
> -AC_LINK_IFELSE(AC_LANG_PROGRAM,[
> +AC_LINK_IFELSE([AC_LANG_SOURCE([AC_LANG_PROGRAM])],[
>  lt_aix_libpath_sed='
>      /Import File Strings/,/^$/ {
>         /^0/ {
> @@ -4937,7 +4937,7 @@
>         # implicitly export all symbols.
>          save_LDFLAGS="$LDFLAGS"
>          LDFLAGS="$LDFLAGS -shared ${wl}-exported_symbol ${wl}foo ${wl}-update_registry ${wl}/dev/null"
> -        AC_LINK_IFELSE(int foo(void) {},
> +        AC_LINK_IFELSE([AC_LANG_SOURCE([int foo(void) {}])],
>            _LT_TAGVAR(archive_expsym_cmds, $1)='$CC -shared $libobjs $deplibs $compiler_flags ${wl}-soname ${wl}$soname `test -n "$verstring" && func_echo_all "${wl}-set_version ${wl}$verstring"` ${wl}-update_registry ${wl}${output_objdir}/so_locations ${wl}-exports_file ${wl}$export_symbols -o $lib'
>          )
>          LDFLAGS="$save_LDFLAGS"
> Index: libgo/configure.ac
> ===================================================================
> --- libgo/configure.ac  (revision 265631)
> +++ libgo/configure.ac  (working copy)
> @@ -6,7 +6,6 @@
>
>  # Process this file with autoreconf to produce configure.
>
> -AC_PREREQ(2.64)
>  AC_INIT(package-unused, version-unused,, libgo)
>  AC_CONFIG_SRCDIR(Makefile.am)
>  AC_CONFIG_HEADER(config.h)
> @@ -248,15 +247,17 @@
>  changequote(,)dnl
>    i[34567]86-*-* | x86_64-*-*)
>  changequote([,])dnl
> -    AC_COMPILE_IFELSE([
> +    AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #ifdef __x86_64__
>  #error 64-bit
> -#endif],
> +#endif
> +])],
>         [GOARCH=386],
> -       AC_COMPILE_IFELSE([
> +       AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #ifdef __ILP32__
>  #error x32
> -#endif],
> +#endif
> +])],
>         [GOARCH=amd64],
>         [GOARCH=amd64p32]))
>      ;;
> @@ -267,20 +268,23 @@
>      GOARCH=m68k
>      ;;
>    mips*-*-*)
> -    AC_COMPILE_IFELSE([
> +    AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #if _MIPS_SIM != _ABIO32
>  #error not o32
> -#endif],
> +#endif
> +])],
>  [mips_abi="o32"],
> -       [AC_COMPILE_IFELSE([
> +       [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #if _MIPS_SIM != _ABIN32
>  #error not n32
> -#endif],
> +#endif
> +])],
>  [mips_abi="n32"],
> -       [AC_COMPILE_IFELSE([
> +       [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #if _MIPS_SIM != _ABI64
>  #error not n64
> -#endif],
> +#endif
> +])],
>  [mips_abi="n64"],
>         [AC_MSG_ERROR([unknown MIPS ABI])
>  [mips_abi="n32"]])])])
> @@ -299,16 +303,18 @@
>      GOARCH=nios2
>      ;;
>    rs6000*-*-* | powerpc*-*-*)
> -    AC_COMPILE_IFELSE([
> +    AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #ifdef _ARCH_PPC64
>  #error 64-bit
> -#endif],
> +#endif
> +])],
>  [GOARCH=ppc],
>      [
> -AC_COMPILE_IFELSE([
> +AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #if defined(_BIG_ENDIAN) || defined(__BIG_ENDIAN__)
>  #error 64be
> -#endif],
> +#endif
> +])],
>  [GOARCH=ppc64le],
>  [GOARCH=ppc64])])
>      ;;
> @@ -316,10 +322,11 @@
>      GOARCH=riscv64
>      ;;
>    s390*-*-*)
> -    AC_COMPILE_IFELSE([
> +    AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #if defined(__s390x__)
>  #error 64-bit
> -#endif],
> +#endif
> +])],
>  [GOARCH=s390],
>  [GOARCH=s390x])
>      ;;
> @@ -330,10 +337,11 @@
>      GOARCH=sh
>      ;;
>    sparc*-*-*)
> -    AC_COMPILE_IFELSE([
> +    AC_COMPILE_IFELSE([AC_LANG_SOURCE([
>  #if defined(__sparcv9) || defined(__arch64__)
>  #error 64-bit
> -#endif],
> +#endif
> +])],
>  [GOARCH=sparc],
>  [GOARCH=sparc64])
>      ;;
> @@ -389,7 +397,7 @@
>  [libgo_cv_c_split_stack_supported],
>  [CFLAGS_hold=$CFLAGS
>  CFLAGS="$CFLAGS -fsplit-stack"
> -AC_COMPILE_IFELSE([[int i;]],
> +AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
>  [libgo_cv_c_split_stack_supported=yes],
>  [libgo_cv_c_split_stack_supported=no])
>  CFLAGS=$CFLAGS_hold])
> @@ -505,7 +513,7 @@
>  [libgo_cv_lib_pthread],
>  [CFLAGS_hold=$CFLAGS
>  CFLAGS="$CFLAGS -pthread -L../libatomic/.libs"
> -AC_COMPILE_IFELSE([[int i;]],
> +AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
>  [libgo_cv_lib_pthread=yes],
>  [libgo_cv_lib_pthread=no])
>  CFLAGS=$CFLAGS_hold])
> @@ -572,11 +580,11 @@
>
>  AC_CACHE_CHECK([for __sync_bool_compare_and_swap_4],
>  [libgo_cv_func___sync_bool_compare_and_swap_4],
> -[AC_LINK_IFELSE([
> +[AC_LINK_IFELSE([AC_LANG_SOURCE([
>  typedef unsigned int uint32  __attribute__ ((mode (SI)));
>  uint32 i;
>  int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
> -],
> +])],
>  [libgo_cv_func___sync_bool_compare_and_swap_4=yes],
>  [libgo_cv_func___sync_bool_compare_and_swap_4=no])])
>  if test "$libgo_cv_func___sync_bool_compare_and_swap_4" = "yes"; then
> @@ -586,11 +594,11 @@
>
>  AC_CACHE_CHECK([for __sync_bool_compare_and_swap_8],
>  [libgo_cv_func___sync_bool_compare_and_swap_8],
> -[AC_LINK_IFELSE([
> +[AC_LINK_IFELSE([AC_LANG_SOURCE([
>  typedef unsigned int uint64  __attribute__ ((mode (DI)));
>  uint64 i;
>  int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
> -],
> +])],
>  [libgo_cv_func___sync_bool_compare_and_swap_8=yes],
>  [libgo_cv_func___sync_bool_compare_and_swap_8=no])])
>  if test "$libgo_cv_func___sync_bool_compare_and_swap_8" = "yes"; then
> @@ -600,11 +608,11 @@
>
>  AC_CACHE_CHECK([for __sync_fetch_and_add_4],
>  [libgo_cv_func___sync_fetch_and_add_4],
> -[AC_LINK_IFELSE([
> +[AC_LINK_IFELSE([AC_LANG_SOURCE([
>  typedef unsigned int uint32  __attribute__ ((mode (SI)));
>  uint32 i;
>  int main() { return __sync_fetch_and_add (&i, 1); }
> -],
> +])],
>  [libgo_cv_func___sync_fetch_and_add_4=yes],
>  [libgo_cv_func___sync_fetch_and_add_4=no])])
>  if test "$libgo_cv_func___sync_fetch_and_add_4" = "yes"; then
> @@ -614,11 +622,11 @@
>
>  AC_CACHE_CHECK([for __sync_add_and_fetch_8],
>  [libgo_cv_func___sync_add_and_fetch_8],
> -[AC_LINK_IFELSE([
> +[AC_LINK_IFELSE([AC_LANG_SOURCE([
>  typedef unsigned int uint64  __attribute__ ((mode (DI)));
>  uint64 i;
>  int main() { return __sync_add_and_fetch (&i, 1); }
> -],
> +])],
>  [libgo_cv_func___sync_add_and_fetch_8=yes],
>  [libgo_cv_func___sync_add_and_fetch_8=no])])
>  if test "$libgo_cv_func___sync_add_and_fetch_8" = "yes"; then
> @@ -632,7 +640,7 @@
>  [libgo_cv_c_stringops],
>  [CFLAGS_hold=$CFLAGS
>  CFLAGS="$CFLAGS -minline-all-stringops"
> -AC_COMPILE_IFELSE([int i;],
> +AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
>  [libgo_cv_c_stringops=yes],
>  [libgo_cv_c_stringops=no])
>  CFLAGS=$CFLAGS_hold])
> @@ -648,7 +656,7 @@
>  [libgo_cv_c_fancymath],
>  [CFLAGS_hold=$CFLAGS
>  CFLAGS="$CFLAGS -mfancy-math-387"
> -AC_COMPILE_IFELSE([int i;],
> +AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
>  [libgo_cv_c_fancymath=yes],
>  [libgo_cv_c_fancymath=no])
>  CFLAGS=$CFLAGS_hold])
> @@ -819,7 +827,7 @@
>  [libgo_cv_c_unused_arguments],
>  [CFLAGS_hold=$CFLAGS
>  CFLAGS="$CFLAGS -Qunused-arguments"
> -AC_COMPILE_IFELSE([[int i;]],
> +AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
>  [libgo_cv_c_unused_arguments=yes],
>  [libgo_cv_c_unused_arguments=no])
>  CFLAGS=$CFLAGS_hold])
> Index: libgomp/Makefile.am
> ===================================================================
> --- libgomp/Makefile.am (revision 265631)
> +++ libgomp/Makefile.am (working copy)
> @@ -1,5 +1,6 @@
>  ## Process this file with automake to produce Makefile.in
>
> +AUTOMAKE_OPTIONS = info-in-builddir
>  ACLOCAL_AMFLAGS = -I .. -I ../config
>  SUBDIRS = testsuite
>
> @@ -136,5 +137,7 @@
>         @touch $@
>
>
> -CLEANFILES = $(STAMP_GENINSRC) $(STAMP_BUILD_INFO) libgomp.info
> +CLEANFILES = $(STAMP_GENINSRC) $(STAMP_BUILD_INFO)
>  MAINTAINERCLEANFILES = $(srcdir)/libgomp.info
> +
> +include $(top_srcdir)/../multilib.am
> Index: libgomp/configure.ac
> ===================================================================
> --- libgomp/configure.ac        (revision 265631)
> +++ libgomp/configure.ac        (working copy)
> @@ -1,7 +1,6 @@
>  # Process this file with autoconf to produce a configure script, like so:
>  # aclocal -I ../config && autoconf && autoheader && automake
>
> -AC_PREREQ(2.64)
>  AC_INIT([GNU Offloading and Multi Processing Runtime Library], 1.0,,[libgomp])
>  AC_CONFIG_HEADER(config.h)
>
> Index: libhsail-rt/configure.ac
> ===================================================================
> --- libhsail-rt/configure.ac    (revision 265631)
> +++ libhsail-rt/configure.ac    (working copy)
> @@ -34,7 +34,6 @@
>  #  POSSIBILITY OF SUCH DAMAGE.
>
>  AC_INIT([phsa HSAIL runtime library], [1.0], [[hidden email]])
> -AC_PREREQ([2.64])
>
>  # Needed to define ${target}.  Needs to be very early to avoid annoying
>  # warning about calling AC_ARG_PROGRAM before AC_CANONICAL_SYSTEM
> Index: libiberty/configure.ac
> ===================================================================
> --- libiberty/configure.ac      (revision 265631)
> +++ libiberty/configure.ac      (working copy)
> @@ -1,6 +1,5 @@
>  dnl Process this file with autoconf to produce a configure script
>
> -AC_PREREQ(2.64)
>  AC_INIT
>  AC_CONFIG_SRCDIR([xmalloc.c])
>
> Index: libitm/Makefile.am
> ===================================================================
> --- libitm/Makefile.am  (revision 265631)
> +++ libitm/Makefile.am  (working copy)
> @@ -1,5 +1,6 @@
>  ## Process this file with automake to produce Makefile.in
>
> +AUTOMAKE_OPTIONS = info-in-builddir
>  ACLOCAL_AMFLAGS = -I .. -I ../config
>  SUBDIRS = testsuite
>
> @@ -118,5 +119,7 @@
>         @touch $@
>
>
> -CLEANFILES = $(STAMP_GENINSRC) $(STAMP_BUILD_INFO) libitm.info
> +CLEANFILES = $(STAMP_GENINSRC) $(STAMP_BUILD_INFO)
>  MAINTAINERCLEANFILES = $(srcdir)/libitm.info
> +
> +include $(top_srcdir)/../multilib.am
> Index: libitm/configure.ac
> ===================================================================
> --- libitm/configure.ac (revision 265631)
> +++ libitm/configure.ac (working copy)
> @@ -15,7 +15,6 @@
>  # along with this program; if not, write to the Free Software
>  # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
>
> -AC_PREREQ(2.59)
>  AC_INIT([GNU TM Runtime Library], 1.0,,[libitm])
>  AC_CONFIG_HEADER(config.h)
>
> Index: libobjc/configure.ac
> ===================================================================
> --- libobjc/configure.ac        (revision 265631)
> +++ libobjc/configure.ac        (working copy)
> @@ -18,7 +18,6 @@
>  #along with GCC; see the file COPYING3.  If not see
>  #<http://www.gnu.org/licenses/>.
>
> -AC_PREREQ(2.64)
>  AC_INIT(package-unused, version-unused,, libobjc)
>  AC_CONFIG_SRCDIR([objc/objc.h])
>  GCC_TOPLEV_SUBDIRS
> Index: liboffloadmic/Makefile.am
> ===================================================================
> --- liboffloadmic/Makefile.am   (revision 265631)
> +++ liboffloadmic/Makefile.am   (working copy)
> @@ -157,3 +157,4 @@
>
>  MAKEOVERRIDES =
>
> +include $(top_srcdir)/../multilib.am
> Index: liboffloadmic/configure.ac
> ===================================================================
> --- liboffloadmic/configure.ac  (revision 265631)
> +++ liboffloadmic/configure.ac  (working copy)
> @@ -28,7 +28,6 @@
>  # Process this file with autoconf to produce a configure script, like so:
>  # aclocal -I .. -I ../config && autoconf && automake
>
> -AC_PREREQ([2.64])
>  AC_INIT([MIC Offload Runtime Library], [1.0], ,[liboffloadmic])
>
>  AC_CANONICAL_SYSTEM
> Index: liboffloadmic/plugin/Makefile.am
> ===================================================================
> --- liboffloadmic/plugin/Makefile.am    (revision 265631)
> +++ liboffloadmic/plugin/Makefile.am    (working copy)
> @@ -122,3 +122,4 @@
>
>  MAKEOVERRIDES =
>
> +include $(top_srcdir)/../../multilib.am
> Index: liboffloadmic/plugin/configure.ac
> ===================================================================
> --- liboffloadmic/plugin/configure.ac   (revision 265631)
> +++ liboffloadmic/plugin/configure.ac   (working copy)
> @@ -29,7 +29,6 @@
>  # Process this file with autoconf to produce a configure script, like so:
>  # aclocal -I ../.. -I ../../config && autoconf && automake
>
> -AC_PREREQ([2.64])
>  AC_INIT([Intel MIC Offload Plugin], [1.0], ,[libgomp-plugin-intelmic])
>
>  AC_CONFIG_AUX_DIR(../..)
> Index: libphobos/Makefile.am
> ===================================================================
> --- libphobos/Makefile.am       (revision 265631)
> +++ libphobos/Makefile.am       (working copy)
> @@ -67,3 +67,5 @@
>
>  # Subdir rules rely on $(FLAGS_TO_PASS)
>  FLAGS_TO_PASS = $(AM_MAKEFLAGS)
> +
> +include $(top_srcdir)/../multilib.am
> Index: libphobos/configure.ac
> ===================================================================
> --- libphobos/configure.ac      (revision 265631)
> +++ libphobos/configure.ac      (working copy)
> @@ -26,7 +26,6 @@
>  #    autoreconf2.64
>  #
>
> -AC_PREREQ(2.64)
>  AC_INIT(package-unused, version-unused,, libphobos)
>  AC_CONFIG_SRCDIR(libdruntime/gcc/attribute.d)
>  AC_CONFIG_HEADERS(config.h)
> Index: libphobos/m4/autoconf.m4
> ===================================================================
> --- libphobos/m4/autoconf.m4    (revision 265631)
> +++ libphobos/m4/autoconf.m4    (working copy)
> @@ -9,7 +9,7 @@
>
>  # AC_LANG(D)
>  # -----------
> -AC_LANG_DEFINE([D], [d], [GDC], [],
> +AC_LANG_DEFINE([D], [d], [GDC], [GDC], [],
>  [ac_ext=d
>  ac_compile='$GDC -c $GDCFLAGS conftest.$ac_ext >&AS_MESSAGE_LOG_FD'
>  ac_link='$GDC -o conftest$ac_exeext $GDCFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&AS_MESSAGE_LOG_FD'
> Index: libphobos/m4/druntime/os.m4
> ===================================================================
> --- libphobos/m4/druntime/os.m4 (revision 265631)
> +++ libphobos/m4/druntime/os.m4 (working copy)
> @@ -164,7 +164,7 @@
>  [
>    AC_LANG_PUSH([C])
>    AC_MSG_CHECKING([for minfo section bracketing])
> -  AC_LINK_IFELSE([
> +  AC_LINK_IFELSE([AC_LANG_SOURCE([
>      void* module_info_ptr __attribute__((section ("minfo")));
>      extern void* __start_minfo __attribute__((visibility ("hidden")));
>      extern void* __stop_minfo __attribute__((visibility ("hidden")));
> @@ -174,7 +174,7 @@
>          // Never run, just to prevent compiler from optimizing access
>          return &__start_minfo == &__stop_minfo;
>      }
> -  ],
> +  ])],
>      [AC_MSG_RESULT([yes])
>       DCFG_MINFO_BRACKETING=true],
>      [AC_MSG_RESULT([no])
> Index: libquadmath/Makefile.am
> ===================================================================
> --- libquadmath/Makefile.am     (revision 265631)
> +++ libquadmath/Makefile.am     (working copy)
> @@ -1,8 +1,7 @@
>  ## Process this file with automake to produce Makefile.in
>
> -AUTOMAKE_OPTIONS = 1.8 foreign
> +AUTOMAKE_OPTIONS = foreign info-in-builddir
>
> -
>  ## Skip over everything if the quadlib is not available:
>  if BUILD_LIBQUADMATH
>  ACLOCAL_AMFLAGS = -I .. -I ../config
> @@ -123,6 +122,7 @@
>  else
>  STAMP_GENINSRC =
>  endif
> +ALL_LOCAL_DEPS = $(STAMP_GENINSRC)
>
>  # AM_CONDITIONAL on configure check ACX_CHECK_PROG_VER([MAKEINFO])
>  if BUILD_INFO
> @@ -132,8 +132,6 @@
>  endif
>
>
> -all-local: $(STAMP_GENINSRC)
> -
>  stamp-geninsrc: libquadmath.info
>         cp -p $(top_builddir)/libquadmath.info $(srcdir)/libquadmath.info
>         @touch $@
> @@ -142,11 +140,13 @@
>         $(MAKEINFO) $(AM_MAKEINFOFLAGS) $(MAKEINFOFLAGS) -I $(srcdir) -o libquadmath.info $(srcdir)/libquadmath.texi
>         @touch $@
>
> -CLEANFILES = $(STAMP_GENINSRC) $(STAMP_BUILD_INFO) libquadmath.info
> +CLEANFILES = $(STAMP_GENINSRC) $(STAMP_BUILD_INFO)
>  MAINTAINERCLEANFILES = $(srcdir)/libquadmath.info
>
>  endif BUILD_LIBQUADMATH
>
> +all-local: $(ALL_LOCAL_DEPS)
> +
>  # Unconditionally override this target, so that automake's definition
>  # does not wrongly interfere.
>  libquadmath.info: $(STAMP_BUILD_INFO)
> @@ -172,3 +172,5 @@
>
>  libquadmath-vers.texi:
>         echo "@set BUGURL $(REPORT_BUGS_TEXI)" > $@
> +
> +include $(top_srcdir)/../multilib.am
> Index: libquadmath/configure.ac
> ===================================================================
> --- libquadmath/configure.ac    (revision 265631)
> +++ libquadmath/configure.ac    (working copy)
> @@ -1,7 +1,6 @@
>  # Process this file with autoconf to produce a configure script, like so:
>  # aclocal && autoconf && autoheader && automake
>
> -AC_PREREQ(2.64)
>  AC_INIT([GCC Quad-precision Math Library], 0.1,,[libquadmath])
>  AC_CONFIG_HEADER(config.h)
>
> Index: libsanitizer/Makefile.am
> ===================================================================
> --- libsanitizer/Makefile.am    (revision 265631)
> +++ libsanitizer/Makefile.am    (working copy)
> @@ -71,3 +71,4 @@
>
>  ## ################################################################
>
> +include $(top_srcdir)/../multilib.am
> Index: libsanitizer/configure.ac
> ===================================================================
> --- libsanitizer/configure.ac   (revision 265631)
> +++ libsanitizer/configure.ac   (working copy)
> @@ -1,7 +1,6 @@
>  #                                               -*- Autoconf -*-
>  # Process this file with autoconf to produce a configure script.
>
> -AC_PREREQ([2.64])
>  AC_INIT(package-unused, version-unused, libsanitizer)
>  AC_CONFIG_SRCDIR([include/sanitizer/common_interface_defs.h])
>
> @@ -253,12 +252,12 @@
>    ALLOC_FILE=alloc.lo
>  else
>    VIEW_FILE=mmapio.lo
> -  AC_PREPROC_IFELSE([
> +  AC_PREPROC_IFELSE([AC_LANG_SOURCE([
>  #include <sys/mman.h>
>  #if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
>    #error no MAP_ANONYMOUS
>  #endif
> -], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
> +])], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
>  fi
>  AC_SUBST(VIEW_FILE)
>  AC_SUBST(ALLOC_FILE)
> Index: libssp/Makefile.am
> ===================================================================
> --- libssp/Makefile.am  (revision 265631)
> +++ libssp/Makefile.am  (working copy)
> @@ -3,7 +3,7 @@
>  ## Copyright (C) 2005-2018 Free Software Foundation, Inc.
>  ##
>
> -AUTOMAKE_OPTIONS = 1.9.5 foreign
> +AUTOMAKE_OPTIONS = foreign
>  ACLOCAL_AMFLAGS = -I .. -I ../config
>  MAINT_CHARSET = latin1
>
> @@ -107,3 +107,4 @@
>
>  ## ################################################################
>
> +include $(top_srcdir)/../multilib.am
> Index: libssp/configure.ac
> ===================================================================
> --- libssp/configure.ac (revision 265631)
> +++ libssp/configure.ac (working copy)
> @@ -2,7 +2,6 @@
>  #
>  # aclocal -I .. -I ../config && autoconf && autoheader && automake
>
> -AC_PREREQ(2.64)
>  AC_INIT(libssp, 1.0)
>  AC_CONFIG_SRCDIR(ssp.c)
>  AC_CANONICAL_SYSTEM
> @@ -131,7 +130,7 @@
>  fi
>
>  AC_MSG_CHECKING([whether vsnprintf is usable])
> -AC_RUN_IFELSE(AC_LANG_PROGRAM([
> +AC_RUN_IFELSE([AC_LANG_PROGRAM([
>  #include <stdarg.h>
>  #include <string.h>
>  #include <stdio.h>
> @@ -147,7 +146,7 @@
>  [char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
>   if (foo (buf, 4, ".%s.", "CDEFG") != 7)
>     return 1;
> - return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]),
> + return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;])],
>  [ssp_have_usable_vsnprintf=define],
>  [ssp_have_usable_vsnprintf=undef],
>  [ssp_have_usable_vsnprintf=undef])
> Index: libstdc++-v3/Makefile.am
> ===================================================================
> --- libstdc++-v3/Makefile.am    (revision 265631)
> +++ libstdc++-v3/Makefile.am    (working copy)
> @@ -172,3 +172,5 @@
>
>  # Subdir rules rely on $(FLAGS_TO_PASS)
>  FLAGS_TO_PASS = $(AM_MAKEFLAGS)
> +
> +include $(top_srcdir)/../multilib.am
> Index: libstdc++-v3/configure.ac
> ===================================================================
> --- libstdc++-v3/configure.ac   (revision 265631)
> +++ libstdc++-v3/configure.ac   (working copy)
> @@ -1,6 +1,5 @@
>  # Process this file with autoreconf to produce a configure script.
>
> -AC_PREREQ(2.64)
>  AC_INIT(package-unused, version-unused,, libstdc++)
>  AC_CONFIG_SRCDIR(src/shared/hashtable-aux.cc)
>  AC_CONFIG_HEADER(config.h)
> Index: libtool.m4
> ===================================================================
> --- libtool.m4  (revision 265631)
> +++ libtool.m4  (working copy)
> @@ -1079,7 +1079,7 @@
>  # to the aix ld manual.
>  m4_defun([_LT_SYS_MODULE_PATH_AIX],
>  [m4_require([_LT_DECL_SED])dnl
> -AC_LINK_IFELSE(AC_LANG_PROGRAM,[
> +AC_LINK_IFELSE([AC_LANG_SOURCE([AC_LANG_PROGRAM])],[
>  lt_aix_libpath_sed='
>      /Import File Strings/,/^$/ {
>         /^0/ {
> @@ -4932,7 +4932,7 @@
>         # implicitly export all symbols.
>          save_LDFLAGS="$LDFLAGS"
>          LDFLAGS="$LDFLAGS -shared ${wl}-exported_symbol ${wl}foo ${wl}-update_registry ${wl}/dev/null"
> -        AC_LINK_IFELSE(int foo(void) {},
> +        AC_LINK_IFELSE([AC_LANG_SOURCE([int foo(void) {}])],
>            _LT_TAGVAR(archive_expsym_cmds, $1)='$CC -shared $libobjs $deplibs $compiler_flags ${wl}-soname ${wl}$soname `test -n "$verstring" && func_echo_all "${wl}-set_version ${wl}$verstring"` ${wl}-update_registry ${wl}${output_objdir}/so_locations ${wl}-exports_file ${wl}$export_symbols -o $lib'
>          )
>          LDFLAGS="$save_LDFLAGS"
> Index: libvtv/Makefile.am
> ===================================================================
> --- libvtv/Makefile.am  (revision 265631)
> +++ libvtv/Makefile.am  (working copy)
> @@ -122,3 +122,5 @@
>  CXXLINK = $(LIBTOOL) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
>         --mode=link $(CXXVTV) $(AM_CXXFLAGS) $(CXXFLAGS) $(AM_LDFLAGS) \
>         $(LDFLAGS) -o $@
> +
> +include $(top_srcdir)/../multilib.am
> Index: libvtv/configure.ac
> ===================================================================
> --- libvtv/configure.ac (revision 265631)
> +++ libvtv/configure.ac (working copy)
> @@ -1,7 +1,6 @@
>  # -*- Autoconf -*-
>  # Process this file with autoconf to produce a configure script.
>
> -AC_PREREQ([2.64])
>  AC_INIT([GNU Vtable Verification Runtime Library], 1.0,,[libvtv])
>  #AC_INIT(package-unused, version-unused, libvtv)
>  AC_CONFIG_SRCDIR([vtv_rts.h])
> Index: lto-plugin/configure.ac
> ===================================================================
> --- lto-plugin/configure.ac     (revision 265631)
> +++ lto-plugin/configure.ac     (working copy)
> @@ -1,4 +1,3 @@
> -AC_PREREQ(2.64)
>  AC_INIT([LTO plugin for ld], 0.1,,[lto-plugin])
>  AC_CANONICAL_SYSTEM
>  GCC_TOPLEV_SUBDIRS
> @@ -18,8 +17,8 @@
>  saved_LDFLAGS="$LDFLAGS"
>  LDFLAGS="$LDFLAGS -static-libgcc"
>  AC_MSG_CHECKING([for -static-libgcc])
> -AC_LINK_IFELSE([
> -  int main() {}], [have_static_libgcc=yes], [have_static_libgcc=no])
> +AC_LINK_IFELSE([AC_LANG_SOURCE([
> +  int main() {}])], [have_static_libgcc=yes], [have_static_libgcc=no])
>  AC_MSG_RESULT($have_static_libgcc);
>  LDFLAGS="$saved_LDFLAGS"
>  # Need -Wc to get it through libtool.
> Index: multilib.am
> ===================================================================
> --- multilib.am (nonexistent)
> +++ multilib.am (working copy)
> @@ -0,0 +1,45 @@
> +## automake - create Makefile.in from Makefile.am
> +
> +## Copyright (C) 1994-2017 Free Software Foundation, Inc.
> +## This Makefile.in is free software; the Free Software Foundation
> +## gives unlimited permission to copy and/or distribute it,
> +## with or without modifications, as long as this notice is preserved.
> +
> +## This program is distributed in the hope that it will be useful,
> +## but WITHOUT ANY WARRANTY; without even the implied warranty of
> +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +## GNU General Public License for more details.
> +
> +MULTISRCTOP =
> +MULTIBUILDTOP =
> +MULTIDIRS =
> +MULTISUBDIR =
> +MULTIDO = true
> +MULTICLEAN = true
> +
> +# GNU Make needs to see an explicit $(MAKE) variable in the command it
> +# runs to enable its job server during parallel builds.  Hence the
> +# comments below.
> +all-multi:
> +       $(MULTIDO) $(AM_MAKEFLAGS) DO=all multi-do # $(MAKE)
> +install-multi:
> +       $(MULTIDO) $(AM_MAKEFLAGS) DO=install multi-do # $(MAKE)
> +mostlyclean-multi:
> +       $(MULTICLEAN) $(AM_MAKEFLAGS) DO=mostlyclean multi-clean # $(MAKE)
> +clean-multi:
> +       $(MULTICLEAN) $(AM_MAKEFLAGS) DO=clean multi-clean # $(MAKE)
> +distclean-multi:
> +       $(MULTICLEAN) $(AM_MAKEFLAGS) DO=distclean multi-clean # $(MAKE)
> +maintainer-clean-multi:
> +       $(MULTICLEAN) $(AM_MAKEFLAGS) DO=maintainer-clean multi-clean # $(MAKE)
> +
> +.MAKE .PHONY: all-multi clean-multi distclean-multi install-am \
> +             install-multi maintainer-clean-multi mostlyclean-multi
> +
> +install-exec-local: install-multi
> +
> +all-local: all-multi
> +mostlyclean-local: mostlyclean-multi
> +clean-local: clean-multi
> +distclean-local: distclean-multi
> +maintainer-clean-local: maintainer-clean-multi
> Index: test-driver
> ===================================================================
> --- test-driver (nonexistent)
> +++ test-driver (working copy)
> @@ -0,0 +1,148 @@
> +#! /bin/sh
> +# test-driver - basic testsuite driver script.
> +
> +scriptversion=2016-01-11.22; # UTC
> +
> +# Copyright (C) 2011-2017 Free Software Foundation, Inc.
> +#
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License as published by
> +# the Free Software Foundation; either version 2, or (at your option)
> +# any later version.
> +#
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program.  If not, see <http://www.gnu.org/licenses/>.
> +
> +# As a special exception to the GNU General Public License, if you
> +# distribute this file as part of a program that contains a
> +# configuration script generated by Autoconf, you may include it under
> +# the same distribution terms that you use for the rest of that program.
> +
> +# This file is maintained in Automake, please report
> +# bugs to <[hidden email]> or send patches to
> +# <[hidden email]>.
> +
> +# Make unconditional expansion of undefined variables an error.  This
> +# helps a lot in preventing typo-related bugs.
> +set -u
> +
> +usage_error ()
> +{
> +  echo "$0: $*" >&2
> +  print_usage >&2
> +  exit 2
> +}
> +
> +print_usage ()
> +{
> +  cat <<END
> +Usage:
> +  test-driver --test-name=NAME --log-file=PATH --trs-file=PATH
> +              [--expect-failure={yes|no}] [--color-tests={yes|no}]
> +              [--enable-hard-errors={yes|no}] [--]
> +              TEST-SCRIPT [TEST-SCRIPT-ARGUMENTS]
> +The '--test-name', '--log-file' and '--trs-file' options are mandatory.
> +END
> +}
> +
> +test_name= # Used for reporting.
> +log_file=  # Where to save the output of the test script.
> +trs_file=  # Where to save the metadata of the test run.
> +expect_failure=no
> +color_tests=no
> +enable_hard_errors=yes
> +while test $# -gt 0; do
> +  case $1 in
> +  --help) print_usage; exit $?;;
> +  --version) echo "test-driver $scriptversion"; exit $?;;
> +  --test-name) test_name=$2; shift;;
> +  --log-file) log_file=$2; shift;;
> +  --trs-file) trs_file=$2; shift;;
> +  --color-tests) color_tests=$2; shift;;
> +  --expect-failure) expect_failure=$2; shift;;
> +  --enable-hard-errors) enable_hard_errors=$2; shift;;
> +  --) shift; break;;
> +  -*) usage_error "invalid option: '$1'";;
> +   *) break;;
> +  esac
> +  shift
> +done
> +
> +missing_opts=
> +test x"$test_name" = x && missing_opts="$missing_opts --test-name"
> +test x"$log_file"  = x && missing_opts="$missing_opts --log-file"
> +test x"$trs_file"  = x && missing_opts="$missing_opts --trs-file"
> +if test x"$missing_opts" != x; then
> +  usage_error "the following mandatory options are missing:$missing_opts"
> +fi
> +
> +if test $# -eq 0; then
> +  usage_error "missing argument"
> +fi
> +
> +if test $color_tests = yes; then
> +  # Keep this in sync with 'lib/am/check.am:$(am__tty_colors)'.
> +  red=' [0;31m' # Red.
> +  grn=' [0;32m' # Green.
> +  lgn=' [1;32m' # Light green.
> +  blu=' [1;34m' # Blue.
> +  mgn=' [0;35m' # Magenta.
> +  std=' [m'     # No color.
> +else
> +  red= grn= lgn= blu= mgn= std=
> +fi
> +
> +do_exit='rm -f $log_file $trs_file; (exit $st); exit $st'
> +trap "st=129; $do_exit" 1
> +trap "st=130; $do_exit" 2
> +trap "st=141; $do_exit" 13
> +trap "st=143; $do_exit" 15
> +
> +# Test script is run here.
> +"$@" >$log_file 2>&1
> +estatus=$?
> +
> +if test $enable_hard_errors = no && test $estatus -eq 99; then
> +  tweaked_estatus=1
> +else
> +  tweaked_estatus=$estatus
> +fi
> +
> +case $tweaked_estatus:$expect_failure in
> +  0:yes) col=$red res=XPASS recheck=yes gcopy=yes;;
> +  0:*)   col=$grn res=PASS  recheck=no  gcopy=no;;
> +  77:*)  col=$blu res=SKIP  recheck=no  gcopy=yes;;
> +  99:*)  col=$mgn res=ERROR recheck=yes gcopy=yes;;
> +  *:yes) col=$lgn res=XFAIL recheck=no  gcopy=yes;;
> +  *:*)   col=$red res=FAIL  recheck=yes gcopy=yes;;
> +esac
> +
> +# Report the test outcome and exit status in the logs, so that one can
> +# know whether the test passed or failed simply by looking at the '.log'
> +# file, without the need of also peaking into the corresponding '.trs'
> +# file (automake bug#11814).
> +echo "$res $test_name (exit status: $estatus)" >>$log_file
> +
> +# Report outcome to console.
> +echo "${col}${res}${std}: $test_name"
> +
> +# Register the test result, and other relevant metadata.
> +echo ":test-result: $res" > $trs_file
> +echo ":global-test-result: $res" >> $trs_file
> +echo ":recheck: $recheck" >> $trs_file
> +echo ":copy-in-global-log: $gcopy" >> $trs_file
> +
> +# Local Variables:
> +# mode: shell-script
> +# sh-indentation: 2
> +# eval: (add-hook 'write-file-hooks 'time-stamp)
> +# time-stamp-start: "scriptversion="
> +# time-stamp-format: "%:y-%02m-%02d.%02H"
> +# time-stamp-time-zone: "UTC0"
> +# time-stamp-end: "; # UTC"
> +# End:
>
> Property changes on: test-driver
> ___________________________________________________________________
> Added: svn:executable
> ## -0,0 +1 ##
> +*
> \ No newline at end of property
> Index: zlib/Makefile.am
> ===================================================================
> --- zlib/Makefile.am    (revision 265631)
> +++ zlib/Makefile.am    (working copy)
> @@ -1,6 +1,6 @@
>  ## Process this file with automake to create Makefile.in.
>
> -AUTOMAKE_OPTIONS = 1.8 cygnus
> +AUTOMAKE_OPTIONS = foreign
>
>  ACLOCAL_AMFLAGS = -I .. -I ../config
>
> @@ -59,3 +59,5 @@
>         "PICFLAG=$(PICFLAG)" \
>         "RANLIB=$(RANLIB)" \
>         "DESTDIR=$(DESTDIR)"
> +
> +include $(top_srcdir)/../multilib.am
> Index: zlib/configure.ac
> ===================================================================
> --- zlib/configure.ac   (revision 265631)
> +++ zlib/configure.ac   (working copy)
> @@ -1,7 +1,6 @@
>  dnl Process this with autoconf to create configure
>
> -AC_PREREQ(2.64)
> -AC_INIT
> +AC_INIT([zlib], [1.1.4])
>  AC_CONFIG_SRCDIR([zlib.h])
>
>  if test -n "${with_target_subdir}"; then
> @@ -14,7 +13,7 @@
>  mkinstalldirs="`cd $ac_aux_dir && ${PWDCMD-pwd}`/mkinstalldirs"
>  AC_SUBST(mkinstalldirs)
>
> -AM_INIT_AUTOMAKE(zlib, 1.1.4)
> +AM_INIT_AUTOMAKE
>
>  AM_MAINTAINER_MODE
>
>
>
> --
> Joseph S. Myers
> [hidden email]
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Re: Update GCC to autoconf 2.69, automake 1.15.1

Simon Marchi-2
On 2018-10-30 11:26 p.m., Joseph Myers wrote:
> This patch (diffs to generated files omitted below) updates GCC to use
> autoconf 2.69 and automake 1.15.1.  (That's not the latest automake
> version, but it's the one used by binutils-gdb, with which consistency
> is desirable, and in any case seems a useful incremental update that
> should make a future update to 1.16.1 easier.)

Whenever you feel like bumping gcc to 1.16.1, I can take care of binutils-gdb.

Simon
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Re: Update GCC to autoconf 2.69, automake 1.15.1

Janne Blomqvist-3
In reply to this post by Richard Biener-2
On Wed, Oct 31, 2018 at 7:05 PM Joseph Myers <[hidden email]>
wrote:

> I've committed this revised patch version


Thank you for taking on this work.


> As noted, my expectation is that libgfortran, libgo, libgomp,
> liboffloadmic, libsanitizer, libphobos maintainers will deal with
> moving those directories to subdir-objects, with any consequent fixes
> needed, to eliminate the automake warnings about subdirectory sources
> without using subdir-objects - and I don't know whether use of ../ in
> source paths in some directories complicates things (if subdir-objects
> would result in attempts to put resulting objects in ../, outside the
> normal build directory for the library) or not.
>

Turned out that for libgfortran, at least, this doesn't seem trivial.
Problem is that we have some of the sources listed relative to $(srcdir) in
Makefile.am, which breaks when enabling subdir-objects. But we can't remove
the $(srcdir) either, becase these sources in question are generated from
m4 sources when --enable-maintainer-mode is enabled, and $(srcdir) is thus
needed so that the generated files will correctly end up in in the source
tree and not the build tree. Gah!

I filed https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87856 to keep track of
this.

--
Janne Blomqvist