Since glibc commit 7594b4e ("posix: Add POSIX aliases to some spawn functions", Lucas Chollet, committed to master 2026-04-07 during the 2.44 development cycle) tests are failing, hanging until the build is cancelled for at least m4, gettext, and gnulib.

This commit is included in Fedora since glibc-2.43.9000-9.fc45

To reproduce you can do as little as:
```
cat << EOF > test.c
#include <spawn.h>
 
int
posix_spawn_file_actions_addchdir (posix_spawn_file_actions_t *fa,
                                   const char *path)
{
  return posix_spawn_file_actions_addchdir_np (fa, path);
}
 
int
main (void)
{
  posix_spawn_file_actions_t fa;
  posix_spawn_file_actions_init (&fa);
  return posix_spawn_file_actions_addchdir (&fa, "/");
}
EOF
 
gcc -D_GNU_SOURCE -O2 -o test test.c && ./test
```

Without `-D_GNU_SOURCE -O2` you will not see a problem.

_USE_XOPEN2K24XSI is only defined when _XOPEN_SOURCE >= 800, and _GNU_SOURCE implies _XOPEN_SOURCE 800. With -O2 it hangs, otherwise it crashes.

Reproducible: Always

Steps to Reproduce:
1. Try to build m4, gettext, or gnulib in rawhide
2. Observe that tests hang and never complete
Actual Results:
Test hang

Expected Results:
Tests complete

Additional Information:
I have not found any reports or fixes against glibc, gnulib, m4, or gettext upstream, only a report against gnulib at https://bugzilla.redhat.com/show_bug.cgi?id=2485708

We have observed the m4, gettext, and gnulib builds hanging on https://riscv-kojipkgs.fedoraproject.org/koji/ but it appears they also did on the main koji during the mass rebuild.