While reviewing https://gitlab.com/redhat/centos-stream/rpms/gcc-toolset-15-gcc/-/merge_requests/22
I saw a few test failures:

cc1: error: cannot load plugin /opt/rh/gcc-toolset-15/root/usr/lib/gcc/x86_64-redhat-linux/15/plugin/annobin.so: /opt/rh/gcc-toolset-15/root/usr/lib/gcc/x86_64-redhat-linux/15/plugin/annobin.so: undefined symbol: _Z7warningiPKcz

Ultimately the problem seems to be that the plugin uses the symbol:

# nm -D /opt/rh/gcc-toolset-15/root/usr/lib/gcc/x86_64-redhat-linux/15/plugin/annobin.so | grep warning
                 U _Z7warningiPKcz

but since https://gcc.gnu.org/cgit/gcc/commit/?id=89991f31c5ded21179b12a9f4063c2b8fabc2e3b gcc no longer provides the symbol:

# nm -D /opt/rh/gcc-toolset-14/root/usr/libexec/gcc/x86_64-redhat-linux/14/cc1  | grep _Z7warningiPKcz
0000000001a55280 T _Z7warningiPKcz
# nm -D /opt/rh/gcc-toolset-15/root/usr/libexec/gcc/x86_64-redhat-linux/15/cc1  | grep _Z7warningiPKcz
#