https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113049
--- Comment #5 from Georg-Johann Lay <gjl at gcc dot gnu.org> --- (In reply to Andreas Schwab from comment #4) > -fno-builtin-strlen has a different purpose. So then -fno-builtin should also not work? GCC documentation of -fno-builtin is the same like for -fno-builtin-function. At least there should be an option to disable this, e.g. you need it when building libgcc / libc anyway, you you get silly non-functional libs.