[Bug c++/109815] New: AIX: Combining -static-libstdc++ and -pthread causes a TLS-related link error

["cameron.heide at betasystems dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109815

            Bug ID: 109815
           Summary: AIX: Combining -static-libstdc++ and -pthread causes a
                    TLS-related link error
           Product: gcc
           Version: 12.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cameron.heide at betasystems dot com
  Target Milestone: ---

With GCC 12.3 on AIX 7.1, trying to link even a trivial program with both the
'-static-libstdc++' and '-pthread' flags causes a link error:

test.cpp:
    int main() { return 0; }

-bash-5.1$ g++12 -static-libstdc++ -pthread -o test test.cpp
ld: 0711-550 SEVERE ERROR: Object
/IMPORT/home/zNTMAKE/betadev/arch/powerpc-aix7.1/gcc12.3/bin/../lib/gcc/powerpc-ibm-aix7.1.5.0/12.3.0/../../../pthread/libstdc++.a[libstdc++.so.6]
cannot be processed.
        RLD at address 0x2b093 for section 7 (.dwinfo) references a
thread-local
        variable, but a TLS-related reference type was not used.
collect2: error: ld returned 12 exit status

Either flag by itself works; it is just the combination of the two that fails.
This combination also worked with GCC 11.3 and only started failing with GCC
12, with the same GCC configuration flags. (I haven't had a chance to try GCC
13 yet.)

The GCC configuration flags are pretty basic:

-bash-5.1$ gcc12 -v
Using built-in specs.
COLLECT_GCC=gcc12
COLLECT_LTO_WRAPPER=/IMPORT/home/zNTMAKE/betadev/arch/powerpc-aix7.1/gcc12.3/bin/../libexec/gcc/powerpc-ibm-aix7.1.5.0/12.3.0/lto-wrapper
Target: powerpc-ibm-aix7.1.5.0
Configured with: ../gcc-12.3.0/configure
--prefix=/home/zNTMAKE/betadev/arch/powerpc-aix7.1/gcc12.3
--with-as=/usr/bin/as --with-ld=/usr/bin/ld --enable-languages=c,c++
--disable-nls --enable-threads --enable-bootstrap
--with-gmp=/home/zNTMAKE/betadev/arch/powerpc-aix7.1/gcc-libs
--with-mpfr=/home/zNTMAKE/betadev/arch/powerpc-aix7.1/gcc-libs
--with-mpc=/home/zNTMAKE/betadev/arch/powerpc-aix7.1/gcc-libs
--with-isl=/home/zNTMAKE/betadev/arch/powerpc-aix7.1/gcc-libs
Thread model: aix
Supported LTO compression algorithms: zlib
gcc version 12.3.0 (GCC)