[Bug libstdc++/119081] libstdc++.modules.json generated with incorrect relative path if configured with '--prefix=/' or '--prefix=' (empty)

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119081

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
In theory you could want /bin/gcc and /include/c++/15.0.0/* and
/lib64/libgcc_s.so ... but I don't see why anybody would.