[Bug fortran/102826] New: Glibc "--disable-mathvec" configure option fail to disable traces to libmvec

[Bug fortran/102826] New: Glibc "--disable-mathvec" configure option fail to disable traces to libmvec

[haochen.jiang at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102826

            Bug ID: 102826
           Summary: Glibc "--disable-mathvec" configure option fail to
                    disable traces to libmvec
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: haochen.jiang at intel dot com
  Target Milestone: ---

When I build Glibc with "--disable-mathvec" and run through this simple
testcase: 

program test_overloaded_intrinsic
  real(4) :: x4(3200), y4(3200)
  real(8) :: x8(3200), y8(3200)

  y4 = sin(x4)
  print *, y4
end

It reports error: undefined reference to `_ZGVeN8v_sin'

It is trying to find libmvec functions, while because of the disabling,
libmvec.so will not be generated.

When I go through gcc file. In gcc/config/gnu-user.h Line 156, we have:

#undef TARGET_F951_OPTIONS
#define TARGET_F951_OPTIONS "%{!nostdinc:\
  %:fortran-preinclude-file(-fpre-include= math-vector-fortran.h finclude%s/)}"

, which is maybe the cause of the error. Because when I clear that
math-vector-fortran.h, the testcase will pass.

[Bug fortran/102826] Glibc "--disable-mathvec" configure option fail to disable traces to libmvec

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102826

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Isn't this a bug in glibc and not gcc. Gcc is doing what glibc header file is
telling it can be done.

[Bug fortran/102826] Glibc "--disable-mathvec" configure option fail to disable traces to libmvec

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102826

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

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

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
math-vector-fortran.h comes from glibc so this is a glibc bug and not a GCC
bug.
installed header files from glibc should match --disable-mathvec .

[Bug fortran/102826] Glibc "--disable-mathvec" configure option fail to disable traces to libmvec

[haochen.jiang at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102826

--- Comment #3 from haochen.jiang at intel dot com ---
(In reply to Andrew Pinski from comment #2)
> math-vector-fortran.h comes from glibc so this is a glibc bug and not a GCC
> bug.
> installed header files from glibc should match --disable-mathvec .

>From my perspective, there maybe bug in glibc.

However, in the gfortran config part of gcc, it should not has the finclude
part for F951 under all circumstances or there should be some option to control
that. This is also a bug I believe.

[Bug fortran/102826] Glibc "--disable-mathvec" configure option fail to disable traces to libmvec

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102826

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Haochen Jiang from comment #3)
> However, in the gfortran config part of gcc, it should not has the finclude
> part for F951 under all circumstances or there should be some option to
> control that. This is also a bug I believe.

Maybe there should be an option but only to workaround bugs in glibc :).