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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug build/29455] New: [gdb/build, clang-13] undefined reference to
 `__atomic_load'
Date: Mon, 08 Aug 2022 08:09:49 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29455

            Bug ID: 29455
           Summary: [gdb/build, clang-13] undefined reference to
                    `__atomic_load'
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

I tried to build gdb with clang-13:
...
$ clang-13 -v=20
clang version 13.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/10
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/11
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/12
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/4=
.8
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/6
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/7
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/8
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/9
Selected GCC installation: /usr/bin/../lib64/gcc/x86_64-suse-linux/12
Candidate multilib: .;@m64
Selected multilib: .;@m64
...
and ran into:
...
/usr/bin/ld: unittests/packed-selftests.o: in function
`std::atomic<packed<unsigned int, 2ul> >::load(std::memory_order) const':
/usr/bin/../lib64/gcc/x86_64-suse-linux/12/../../../../include/c++/12/atomi=
c:285:
undefined reference to `__atomic_load'
/usr/bin/ld: unittests/packed-selftests.o: in function
`std::atomic<packed<unsigned int, 2ul> >::store(packed<unsigned int, 2ul>,
std::memory_order)':
/usr/bin/../lib64/gcc/x86_64-suse-linux/12/../../../../include/c++/12/atomi=
c:271:
undefined reference to `__atomic_store'
clang-13.0: error: linker command failed with exit code 1 (use -v to see
invocation)
make[1]: *** [gdb] Error 1
make[1]: Target `all' not remade because of errors.
make[1]: Leaving directory `/home/vries/gdb_versions/devel/build/gdb'
make: *** [all-gdb] Error 2
...

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