Fix warning about undefined identifier [-Wundef].

Thanks to Samuel Thibault for the report.

diff --git a/include/xbt/log.h b/include/xbt/log.h
index c33d0ff..6589249 100644 (file)
--- a/include/xbt/log.h
+++ b/include/xbt/log.h
@@ -91,7 +91,7 @@ typedef enum {
 #define _XBT_LOG_CONCAT(x, y) x ## y
 #define _XBT_LOG_CONCAT2(x, y) _XBT_LOG_CONCAT(x, y)
 /* Apparently, constructor priorities are not supported by gcc on Macs */
 #define _XBT_LOG_CONCAT(x, y) x ## y
 #define _XBT_LOG_CONCAT2(x, y) _XBT_LOG_CONCAT(x, y)
 /* Apparently, constructor priorities are not supported by gcc on Macs */

-#if __GNUC__ && __APPLE__
+#if defined(__GNUC__) && defined(__APPLE__)

 #  define _XBT_LOGV_CTOR_ATTRIBUTE
 #else
 #  define _XBT_LOGV_CTOR_ATTRIBUTE _XBT_GNUC_CONSTRUCTOR(600)
 #  define _XBT_LOGV_CTOR_ATTRIBUTE
 #else
 #  define _XBT_LOGV_CTOR_ATTRIBUTE _XBT_GNUC_CONSTRUCTOR(600)