Thanks for reporting this! Confirmed that linking with
$(shared-thread-library) fixes the problem. I'll send a patch.

On Wed, Mar 8, 2023 at 6:50 AM Joseph Myers <joseph@codesourcery.com> wrote:

> This breaks the testsuite build for Hurd (tst-system needs to link with
> $(shared-thread-library), I think).
>
> /scratch/jmyers/glibc-bot/install/compilers/i686-gnu/lib/gcc/i686-glibc-gnu/12.2.1/../../../../i686-glibc-gnu/bin/ld:
> /scratch/jmyers/glibc-bot/build/glibcs/i686-gnu/glibc/support/libsupport_nonshared.a(xpthread_create.oS):
> in function `xpthread_create':
> /scratch/jmyers/glibc-bot/src/glibc/support/xpthread_create.c:26:
> undefined reference to `pthread_create'
> /scratch/jmyers/glibc-bot/install/compilers/i686-gnu/lib/gcc/i686-glibc-gnu/12.2.1/../../../../i686-glibc-gnu/bin/ld:
> /scratch/jmyers/glibc-bot/build/glibcs/i686-gnu/glibc/support/libsupport_nonshared.a(xpthread_join.oS):
> in function `xpthread_join':
> /scratch/jmyers/glibc-bot/src/glibc/support/xpthread_join.c:25: undefined
> reference to `pthread_join'
> collect2: error: ld returned 1 exit status
> make[3]: *** [../Rules:238:
> /scratch/jmyers/glibc-bot/build/glibcs/i686-gnu/glibc/stdlib/tst-system]
> Error 1
>
> https://sourceware.org/pipermail/libc-testresults/2023q1/010979.html
>
> --
> Joseph S. Myers
> joseph@codesourcery.com
>