[Bug java/45433] Can't find GCCMain in org.eclipse.jdt.internal.compiler.batch.GCCMain

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[Bug java/45433] Can't find GCCMain in org.eclipse.jdt.internal.compiler.batch.GCCMain

aoliva at gcc dot gnu.org
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45433

--- Comment #4 from Bruno Haible <bruno at clisp dot org> ---
I am having the same error, even with option -C (which does not need a
-fmain=... option):

$ gcj -v -C HelloWorld.java
Using built-in specs.
COLLECT_GCC=/arch/x86-linux/gnu-inst-gcc/4.7.3/bin/gcj
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.7.3/configure --build=i686-pc-linux-gnu
--host=i686-pc-linux-gnu --target=i686-pc-linux-gnu
--prefix=/arch/x86-linux/gnu-inst-gcc/4.7.3 --enable-shared
--enable-version-specific-runtime-libs --enable-nls --enable-threads=posix
--enable-__cxa_atexit --with-as=/arch/x86-linux/gnu/bin/as32
--with-gmp=/arch/x86-linux/gnu-inst-gcc/4.7.3
--with-mpfr=/arch/x86-linux/gnu-inst-gcc/4.7.3
--with-mpc=/arch/x86-linux/gnu-inst-gcc/4.7.3
--with-libelf=/arch/x86-linux/gnu-inst-gcc/4.7.3
--with-ecj-jar=/gfs/petix/Volumes/ExtData/source/gnu/gcc/sourceware.org-ecj/ecj-latest.jar
Thread model: posix
gcc version 4.7.3 (GCC)
COLLECT_GCC_OPTIONS='-fsaw-java-file' '-B'
'/media/nas/pub/arch/x86-linux/gnu-inst-gcc/4.7.3/libexec/gcc/i686-pc-linux-gnu/4.7.3'
'-v' '-C'
'-fbootclasspath=./:/media/nas/pub/arch/x86-linux/gnu-inst-gcc/4.7.3/bin/../lib/gcc/../../share/java/libgcj-4.7.3.jar'
'-g1' '-fsyntax-only' '-femit-class-files' '-S' '-o' 'NONE' '-shared-libgcc'
'-mtune=generic' '-march=pentiumpro'

/media/nas/pub/arch/x86-linux/gnu-inst-gcc/4.7.3/libexec/gcc/i686-pc-linux-gnu/4.7.3/ecj1
HelloWorld.java -g1
-fbootclasspath=./:/media/nas/pub/arch/x86-linux/gnu-inst-gcc/4.7.3/bin/../lib/gcc/../../share/java/libgcj-4.7.3.jar
-g1 -fsource=1.5 -ftarget=1.5 -fzip-dependency /tmp/ccrzqP4M.zip
Exception in thread "main" java.lang.NoClassDefFoundError:
org.eclipse.jdt.internal.compiler.batch.GCCMain
   at gnu.java.lang.MainThread.run(MainThread.java:100)
Caused by: java.lang.ClassNotFoundException:
org.eclipse.jdt.internal.compiler.batch.GCCMain not found in
gnu.gcj.runtime.SystemClassLoader{urls=[],
parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
   at java.net.URLClassLoader.findClass(URLClassLoader.java)
   at gnu.gcj.runtime.SystemClassLoader.findClass(natSystemClassLoader.cc:27)
   at java.lang.ClassLoader.loadClass(ClassLoader.java)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:387)
   at gnu.java.lang.MainThread.run(MainThread.java)

The problem is that the file that I specified as --with-ecj-jar value when
configuring GCC no longer exists. The GCC installation has not copied the file
to the GCC installation directory! But the ecj1 program still references it.

I cannot find an option to tell ecj1 about the new file name of ecj-latest.jar.
So I ended up creating a symlink so that the old file name still works.