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From: "haochen.jiang at intel dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/28481] New: Glibc "--disable-mathvec" configure option
 fail to disable traces to libmvec
Date: Thu, 21 Oct 2021 06:39:46 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28481

            Bug ID: 28481
           Summary: Glibc "--disable-mathvec" configure option fail to
                    disable traces to libmvec
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: haochen.jiang at intel dot com
  Target Milestone: ---

When I build Glibc with "--disable-mathvec" and run through this simple
testcase in fortran:=20

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

  y4 =3D sin(x4)
  print *, y4
end

It reports error: undefined reference to `_ZGVeN8v_sin'

Also for c, it has the same error using similar simple testcase in c. 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=3D math-vector-fortran.h finclude=
%s/)}"

, which is maybe the cause of the error for fortran. Because when I clear t=
hat
math-vector-fortran.h, the testcase will pass, which means glibc did not te=
ll
gcc to exclude that file under "--disable-mathvec" option.

--=20
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