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

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

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

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Cyano Hao from comment #3)
> Empty prefix can be used to avoid hard-coded absolute paths so compilers can
> be copied/moved anywhere.

GCC has relocation support in it and has since at least 2010 (I even think it
has been working since before 2000 but I am not 100% sure). So there is no need
for an empty prefix.