some progress

Common/Std/stub.c

@@ -6,5 +6,15 @@ void com_std_printf(char const *fmt, ...) {}
 
 double com_std_sqrt(double v) { return __builtin_sqrt(v); }
 double com_std_fabs(double v) { return __builtin_fabs(v); }
+#if COM_DEF_COMPILER == COM_DEF_COMPILER_CLANG
 double com_std_sin(double v) { return __builtin_sin(v); }
 double com_std_cos(double v) { return __builtin_cos(v); }
+#else
+/* TODO: Use fsin/fcos, no matter how slow. */
+double com_std_sin(double v) { return 0; }
+double com_std_cos(double v) { return 0; }
+#endif
+
+// void memcpy(void *__restrict dest, const void *__restrict src, size_t n) {
+//   __builtin_memcpy(dest, src, n);
+// };