https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82590
--- Comment #1 from bastl <bastl at eclipso dot de> --- Compiling gcc-7.2.0 with gcc-7.2.0 works fine. What I did on this error and the other errors followed: comment out the definitions cousing the errors like: 1.) gcc/system.h:496:14: error: ambiguating new declaration of 'char* strstr(const char*, const char*)' extern char *strstr (const char *, const char *); 2.) gcc/system.h:540:20: error: conflicting declaration of C function 'const char* strsignal(int)' extern const char *strsignal (int); in the source directory in: 3.) include/libiberty.h:112:14: error: ambiguating new declaration of 'char* basename(const char*)' extern char *basename (const char *) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1); 4.) gcc/timevar.c:28:13: error: conflicting declaration 'typedef int clock_t' typedef int clock_t; 5.) gcc/timevar.c:32:8: error: redefinition of 'struct tms' struct tms then # make -i because all other errors don't matter to have a working gcc-7.2.0 compiler that can compile itself. # make -i install and remake gcc itself.
