importc.h: Don't undefine __has_(feature|extension) on >=gcc-14

GCC 14 started emitting a warning about those two `#undef`s. This breaks basically all C tests as it interferes with the output. Signed-off-by: Andrei Horodniceanu <[email protected]>
dlang · Jun 5, 2024 · f560757 · f560757
1 parent 05c8980
commit f560757
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/druntime/src/importc.h b/druntime/src/importc.h
@@ -97,12 +97,17 @@ typedef unsigned long long __uint64_t;
  * __has_extension is a clang thing:
  *    https://clang.llvm.org/docs/LanguageExtensions.html
  * ImportC no has extensions.
+ *
+ * >=gcc-14 prints a warning for each #undef. This breaks a lot of
+ * things like the testsuite which expects clean output.
  */
+#if __GNUC__ < 14
 #undef __has_feature
 #define __has_feature(x) 0
 
 #undef __has_extension
 #define __has_extension(x) 0
+#endif
 
 /*************************************
  * OS-specific macros