https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95800
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Perhaps log2 is in DJGPP a macro (which the C standard allows)? In that case, you either need to #undef that macro, or use double (log2)(double x) { ... }