[Bug math/20469] New: [x86_64] Link fail with -fopenmp and -ffast-math

["guanx.bac at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20469

            Bug ID: 20469
           Summary: [x86_64] Link fail with -fopenmp and -ffast-math
           Product: glibc
           Version: 2.24
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: guanx.bac at gmail dot com
                CC: andrew.n.senkevich at gmail dot com, hjl.tools at gmail dot com,
                    jsm28 at gcc dot gnu.org, kirill.yukhin at intel dot com
  Target Milestone: ---

+++ This bug was initially created as a clone of Bug #19058 +++

-bash-4.2$ cat test.c
#include <math.h>
#define size 4096
double x[size];
double y[size];

__attribute__((noinline))
int foo()
{
  int i;

#pragma omp simd
  for (i = 0; i < size; i++)
    {
      x[i] = log(y[i]);
    }

  return (int) x[0];
}

int main()
{
  int i = 0;

  for (i = 0; i < size; i++)
    {
      y[i] = sin(i);
    }

  return (foo());
}

-bash-4.2$ gcc -O1 -fopenmp -ffast-math test.c -lm
/tmp/cccKGzmh.o: In function `foo':
test.c:(.text+0xf): undefined reference to `_ZGVbN2v___log_finite'
collect2: error: ld returned 1 exit status

gcc version 5.3.0
glibc version 2.23
Linux distribution Slackware64-14.2.
Tried to upgrade to gcc 5.4.0 and/or glibc 2.24 but the error persists.

Related discussion: https://sourceware.org/ml/libc-alpha/2015-06/msg00213.html

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