https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113278
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever confirmed|0 |1 Last reconfirmed| |2024-01-09 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- So for C++, -std=c++98 (and others) are passed which causes __STRICT_ANSI__ to be defined which in turn newlib decides not to enable POSIX functions (via defining _DEFAULT_SOURCE which defines _POSIX_SOURCE). So confirmed, this is just a testsuite issue and the simple way of fixing this is to add -D_GNU_SOURCE to the command line options which causes the POSIX functions in stdio.h to be declared.