sumtype: detect compilers with extensions off

mcha-forks · Jan 2, 2025 · f728442 · f728442
1 parent 25c2d7c
commit f728442
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/include/stc/sys/sumtype.h b/include/stc/sys/sumtype.h
@@ -106,7 +106,10 @@ int main(void) {
         c_EVAL(c_LOOP(_c_vartuple_var, T, __VA_ARGS__, (0),)) \
     }
 
-#if defined __GNUC__ || defined __clang__ || defined __TINYC__ || _MSC_VER >= 1939
+#if (defined(__clang__) && !__is_identifier(__typeof__)) \
+    || (defined(__GNUC__) && __has_builtin(__typeof__))  \
+    || defined(__TINYC__)                                \
+    || _MSC_FULL_VER >= 193933428
     #define c_when(var) \
         for (__typeof__(var) _match = (var); _match; _match = NULL) \
         switch (_match->_any_.tag)