New subject: [Bug 1070905] glibc: Fail to build shared objects that use libmvec.so functions.

3 Dec 2017

      http://bugzilla.suse.com/show_bug.cgi?id=1070905

            Bug ID: 1070905
           Summary: glibc: Fail to build shared objects that use
                    libmvec.so functions.
    Classification: openSUSE
           Product: openSUSE Distribution
           Version: Leap 42.3
          Hardware: Other
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Basesystem
          Assignee: bnc-team-screening@forge.provo.novell.com
          Reporter: mardnh@gmx.de
        QA Contact: qa-bugs@suse.de
          Found By: ---
           Blocker: ---

With gcc6 or gcc7 you can build shared objects which are optimized to call
libmvec.so functions. When such calls go through the _finite aliases the linker
is unable to assemble the final user shared object because the calls contain
non-PIC relocs against shared object symbols.

The build failures being seen on Leap systems are:
$ gcc-6 ./log.c -O3 -fopenmp -ffast-math -I/usr/include -fPIC -shared -lm -o
log.so
/usr/lib64/gcc/x86_64-suse-linux/6/../../../../x86_64-suse-linux/bin/ld:
/usr/lib64/libmvec_nonshared.a(svml_finite_alias.o_X86_64_PC32 against symbol
`_ZGVbN2v_log@@GLIBC_2.22' can not be used when making a shared object;
recompile with -fPIC
/usr/lib64/gcc/x86_64-suse-linux/6/../../../../x86_64-suse-linux/bin/ld: final
link failed: Bad value
collect2: error: ld returned 1 exit status

The bug seems known fixed upstream:
https://sourceware.org/bugzilla/show_bug.cgi?id=19590
https://lists.debian.org/debian-glibc/2016/03/msg00125.html

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[Bug 1070905] New: glibc: Fail to build shared objects that use libmvec.so functions.

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