libxl: fix build for gcc prior to 4.3

So far all we (explicitly) require is gcc 3.4 or better, so we
shouldn't be unconditionally using features supported only by much
newer versions.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index cf5d9e92df647cfec8b43f9b4eeec3ec7cafbfc8..7c3b1797389f180d233b77d0af9c76331341d12c 100644 (file)
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -55,8 +55,10 @@
 #ifdef LIBXL_H
 # error libxl.h should be included via libxl_internal.h, not separately
 #endif
-#define LIBXL_EXTERNAL_CALLERS_ONLY \
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
+# define LIBXL_EXTERNAL_CALLERS_ONLY \
     __attribute__((warning("may not be called from within libxl")))
+#endif
 
 #include "libxl.h"
 #include "_paths.h"