i recently run into a missing glibc abi compat symbol
when trying to run a glibc linked executable with musl.

__strftime_l is at least used by glibc linked libstdc++
but glibc linked libstdc++ can have compatibility issues
with musl so it's not clear how commonly it is useful.

likewise i don't know how likely the glibc libresolv
symbols may be useful to have in musl.

but it does not seem to hurt to have these exported.