[Bug fortran/108175] New: Target macros missing in gfortran with -cpp (C preprocessor)

[Bug fortran/108175] New: Target macros missing in gfortran with -cpp (C preprocessor)

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108175

            Bug ID: 108175
           Summary: Target macros missing in gfortran with -cpp (C
                    preprocessor)
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
  Target Milestone: ---

Compare

  touch foo.c; gcc -E -cpp -dM foo.c
  foo.F90; gfortran -E -cpp -dM foo.F90

And note that in the C case, there are several target macros defined, e.g. on
my system:

__amd64, __amd64__, __ELF__, __linux, __linux__, linux, __unix, __unix__, unix
__x86_64, __x86_64__

EXPECTED: Those are also available with gfortran – as they are very useful to
generate some conditional code, especially for systems like Windows or embedded
systems where certains things don't work or work differently.

[Bug fortran/108175] Target macros missing in gfortran with -cpp (C preprocessor)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108175

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
fortran/cpp.cc (cpp_define_builtins) has this commented out:
  /* FIXME: Pandora's Box
    Using the macros below results in multiple breakages:
     - mingw will fail to compile this file as dependent macros
       assume to be used in c-cppbuiltin.cc only. Further, they use
       flags only valid/defined in C (same as noted above).
       [config/i386/mingw32.h, config/i386/cygming.h]
     - other platforms (not as popular) break similarly
       [grep for 'builtin_define_with_int_value' in gcc/config/]

  TARGET_CPU_CPP_BUILTINS ();
  TARGET_OS_CPP_BUILTINS ();
  TARGET_OBJFMT_CPP_BUILTINS (); */
See r0-87639-g3c2a68b3a308d07c

[Bug fortran/108175] Target macros missing in gfortran with -cpp (C preprocessor)

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108175

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 42954

*** This bug has been marked as a duplicate of bug 42954 ***