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From: "judge.packham at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgcc/111322] New: non-canonical reference to canonical
 protected function `__pthread_key_create'
Date: Thu, 07 Sep 2023 08:27:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111322

            Bug ID: 111322
           Summary: non-canonical reference to canonical protected
                    function `__pthread_key_create'
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: judge.packham at gmail dot com
  Target Milestone: ---

Created attachment 55849
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55849&action=3Dedit
Exclude UCLIBC from GLIBC thread check

With binutils-2.40, uClibc-ng-1.0.43 and gcc-13.2.0 the following link erro=
r is
seen for some C++ code (ISL in this case).

ld.bfd: isl_test_cpp17.o: non-canonical reference to canonical protected
function `__pthread_key_create' in
x86_64-multilib-linux-uclibc/sysroot/lib64/libc.so.1
ld.bfd: failed to set dynamic section sizes: bad value

The problem appears to be that GCC uses the presence of __pthread_key_creat=
e()
to detect the use of pthreads with GNU libc but because uclibc-ng also defi=
nes
__GLIBC__ it ends up using the same symbol which for uclibc-ng is marked
protected. It looks as though the intended symbol should be pthread_cancel(=
) as
for other libcs.

The attached patch is my attempt to resolve the issue.=