https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92620
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #1) > Why do you think this is a bug? > > From https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gcc/Standards.html#Standards: > Most of the compiler support routines used by GCC are present in libgcc, but > there are a few exceptions. GCC requires the freestanding environment > provide memcpy, memmove, memset and memcmp. Finally, if __builtin_trap is > used, and the target does not implement the trap pattern, then GCC emits a > call to abort. Note this is about -ffreestanding option but it also applies to -fno-builtin because of: https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gcc/C-Dialect-Options.html: -ffreestanding Assert that compilation targets a freestanding environment. This implies -fno-builtin
