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Re: -static with -mieee-fp flags Possible bug?
On Fri, Sep 14, 2012 at 5:18 AM, José Luis García Pallero
<jgpallero@gmail.com> wrote:
>
> /usr/lib/gcc/i486-linux-gnu/4.7/../../../i386-linux-gnu/libieee.a:(.data+0x0):
> multiple definition of `_LIB_VERSION'
> /usr/lib/gcc/i486-linux-gnu/4.7/../../../i386-linux-gnu/libm.a(s_lib_version.o):(.data+0x0):
> first defined here collect2: error: ld returned 1 exit status
This looks like a glibc bug to me.
When GCC sees -mieee-fp on a GNU/Linux system, it adds -lieee to the
link line. This is intended to include a symbol that tells glibc to
use IEEE mode for math functions. For some reason that is causing the
multiple definition error. I frankly don't know why, but it looks
like a problem in glibc, not GCC.
> Some time ago I posted a similar question
> (http://gcc.gnu.org/ml/gcc-help/2009-12/msg00152.html) and the answer
> was that the error was in libc from Debian. But the tests in RedHat
> show that the error is not due to Debian, and depends on -mieee-fp
> flag from gcc
The earlier answer was perhaps too specific in stressing Debian. The
bug seems to be in the C library. Both Debian and Red Hat use the
same library, albeit with their own local patches.
Ian