https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118121
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Last reconfirmed| |2024-12-19 Status|UNCONFIRMED |NEW --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- What libiberty/{make-temp-file.c,pex-common.c} do is just unconditionally declares mkstemps: extern int mkstemps (char *, int); So I think the fix should be simple as doing this: extern "C" int mkstemps (char *, int); inside lto-wrapper.cc towards the top (with maybe a comment saying it is always included in libiberty if libc does not have a definition.