fix Issue 22598 - importC: Add support for __extension__ keyword

WalterBright · dlang-bot · commit 6feed76bdc70 · 2022-02-11T07:55:55.000Z
diff --git a/src/importc.h b/src/importc.h
@@ -37,3 +37,9 @@
 #define __handle
 #define __inline        // ImportC does its own notion of inlining
 #define __pascal
+
+/****************************
+ * __extension__ is a GNU C extension. It suppresses warnings
+ * when placed before an expression.
+ */
+#define __extension__  // ignore it, as ImportC doesn't do warnings
