https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68737
--- Comment #9 from dave.anglin at bell dot net --- On 2018-09-04 6:38 AM, redi at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68737 > > --- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> --- > Could you see what this prints on the target please? # ./test using vsnprintf returned 4, errno = 0 > > #include <cerrno> > > int > getlen(char* __out, int __size __attribute__((unused)), const char* __fmt, > ...) > { > __builtin_va_list __args; > __builtin_va_start(__args, __fmt); > > #if _GLIBCXX_USE_C99_STDIO > __builtin_puts("using vsnprintf"); > const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args); > #else > __builtin_puts("using vsprintf"); > const int __ret = __builtin_vsprintf(__out, __fmt, __args); > #endif > return __ret; > } > > int main() > { > char out[64]; > errno = 0; > int len = getlen(out, 0, "%.*g", 6, 1.99); > __builtin_printf("returned %d, errno = %d\n", len, errno); > } >
