compiler: Fix SENTINEL macro in non-GCC case.

[pspp-builds.git] / src / libpspp / compiler.h

diff --git a/src/libpspp/compiler.h b/src/libpspp/compiler.h
index d22819446f5e5ee7a5eececf9c4f0e3ef261e758..a7e91bfec1f805b35c8f2c6d15608fcf556bbc68 100644 (file)
--- a/src/libpspp/compiler.h
+++ b/src/libpspp/compiler.h
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 2006, 2009 Free Software Foundation, Inc.
+   Copyright (C) 2006, 2009, 2010 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -77,4 +77,14 @@
 #define PURE_FUNCTION
 #endif
 
+/* This attribute indicates that the argument with the given
+   IDX must be a null pointer.  IDX counts backward in the
+   argument list, so that 0 is the last argument, 1 is the
+   second-from-last argument, and so on. */
+#if __GNUC__ > 3
+#define SENTINEL(IDX) ATTRIBUTE ((sentinel(IDX)))
+#else
+#define SENTINEL(IDX)
+#endif
+
 #endif /* compiler.h */