cmake HAVE_FUNC_ATTRIBUTE_FORMAT_GNU_PRINTF examples

netdata/netdata CMakeLists.txt :645

check_c_source_compiles("
void my_printf(char const *s, ...) __attribute__((format(gnu_printf, 1, 2)));
int main() { return 0; }
" HAVE_FUNC_ATTRIBUTE_FORMAT_GNU_PRINTF FAIL_REGEX "warning:")