I don't know, but this more in-depth status page punts with "Library feature, no compiler support required", quite a bit: https://gcc.gnu.org/c99status.html htt

I don't know, but this more in-depth status page punts with "Library feature, no compiler support required", quite a bit: https://gcc.gnu.org/c99status.html https://gcc.gnu.org/c99status.html I can't find a similar page for glibc, so maybe the issue is there?