Re: Deprecate -traditional-cpp?

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Re: Deprecate -traditional-cpp?

Steve Kargl
On Thu, Sep 05, 2019 at 02:16:08PM +0300, Janne Blomqvist wrote:

> On Thu, Sep 5, 2019 at 2:08 PM Nathan Sidwell <[hidden email]> wrote:
> >
> > Is it time to deprecate traditional preprocessing?  It's been  30 years
> > since C89.  Are (non-compiler) tools that use it still things?
> >
> > Handling it gets its hooks into a bunch of odd places in libcpp.
> >
> > To be specific: deprecate -traditional-cpp for GCC10, remove in GCC11.
>
> The Fortran frontend uses traditional mode, for reasons I can't recall
> at the moment.
>

Modern C allows single line comments to start with //

program hello
   print *, "Hello " // "world!"
end progra


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Steve
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Re: Deprecate -traditional-cpp?

Steve Kargl
On Thu, Sep 05, 2019 at 07:08:48AM -0700, Steve Kargl wrote:

> On Thu, Sep 05, 2019 at 07:03:25AM -0700, Steve Kargl wrote:
> > On Thu, Sep 05, 2019 at 02:16:08PM +0300, Janne Blomqvist wrote:
> > > On Thu, Sep 5, 2019 at 2:08 PM Nathan Sidwell <[hidden email]> wrote:
> > > >
> > > > Is it time to deprecate traditional preprocessing?  It's been  30 years
> > > > since C89.  Are (non-compiler) tools that use it still things?
> > > >
> > > > Handling it gets its hooks into a bunch of odd places in libcpp.
> > > >
> > > > To be specific: deprecate -traditional-cpp for GCC10, remove in GCC11.
> > >
> > > The Fortran frontend uses traditional mode, for reasons I can't recall
> > > at the moment.
> > >
> >
> > Modern C allows single line comments to start with //
> >
> > program hello
> >    print *, "Hello " // "world!"
> > end program
>
> With trunk,
>
> % ~/work/bin/cpp hello.F90
> # 1 "hello.F90"
> # 1 "<built-in>"
> # 1 "<command-line>"
> # 1 "hello.F90"
> program hello
>    print *, "Hello "
> end program
>

There are 9 open PRs about cpp and Fortran.  Of those nine, these
seem to be important for moving to modern cpp.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67623
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56659
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53934
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42954
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28662

--
Steve
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Re: Deprecate -traditional-cpp?

Gaius Mulley-2
Steve Kargl <[hidden email]> writes:

> On Thu, Sep 05, 2019 at 07:08:48AM -0700, Steve Kargl wrote:
>> On Thu, Sep 05, 2019 at 07:03:25AM -0700, Steve Kargl wrote:
>> > On Thu, Sep 05, 2019 at 02:16:08PM +0300, Janne Blomqvist wrote:
>> > > On Thu, Sep 5, 2019 at 2:08 PM Nathan Sidwell <[hidden email]> wrote:
>> > > >
>> > > > Is it time to deprecate traditional preprocessing?  It's been  30 years
>> > > > since C89.  Are (non-compiler) tools that use it still things?
>> > > >
>> > > > Handling it gets its hooks into a bunch of odd places in libcpp.
>> > > >
>> > > > To be specific: deprecate -traditional-cpp for GCC10, remove in GCC11.
>> > >
>> > > The Fortran frontend uses traditional mode, for reasons I can't recall
>> > > at the moment.
>> > >
>> >
>> > Modern C allows single line comments to start with //
>> >
>> > program hello
>> >    print *, "Hello " // "world!"
>> > end program
>>
>> With trunk,
>>
>> % ~/work/bin/cpp hello.F90
>> # 1 "hello.F90"
>> # 1 "<built-in>"
>> # 1 "<command-line>"
>> # 1 "hello.F90"
>> program hello
>>    print *, "Hello "
>> end program
>>
>
> There are 9 open PRs about cpp and Fortran.  Of those nine, these
> seem to be important for moving to modern cpp.
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67623
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56659
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53934
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42954
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28662

for the sake of completeness - Modula-2 can also use cpp in traditional
mode.  I quite like the solution suggested in:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67623

"Fortran devs need to add a Fortran mode to CPP." which could apply to
Modula-2 as well


regards,
Gaius