https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89066
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target|*-mingw* *-cygwin* |i686-w64-mingw32 Component|c |driver Host| |i686-w64-mingw32 Build| |i686-w64-mingw32 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- > cc1 -E -quiet -v -iprefix > N:/nesys/asm6/src/../lib/gcc/i686-w64-mingw32/8.1.0/ -U_REENTRANT good.c > -mtune=generic -march=i686 -fpch-preprocess -o good.i >gcc: error: CreateProcess: No such file or directory This is the problem the GCC driver can't find cc1. The replacement of \ to / is valid transformation for Windows.