use _GL_ATTRIBUTE_CONST and _GL_ATTRIBUTE_PURE

[gnulib.git] / lib / filenamecat-lgpl.c

diff --git a/lib/filenamecat-lgpl.c b/lib/filenamecat-lgpl.c
index 8cb2da4..1e3e63a 100644 (file)
--- a/lib/filenamecat-lgpl.c
+++ b/lib/filenamecat-lgpl.c
@@ -31,10 +31,18 @@
 # define mempcpy(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
 #endif
 
+/* The attribute __pure__ was added in gcc 2.96.  */
+#undef _GL_ATTRIBUTE_PURE
+#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
+# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
+#else
+# define _GL_ATTRIBUTE_PURE /* empty */
+#endif
+
 /* Return the longest suffix of F that is a relative file name.
    If it has no such suffix, return the empty string.  */
 
-static char const *
+static char const * _GL_ATTRIBUTE_PURE
 longest_relative_suffix (char const *f)
 {
   for (f += FILE_SYSTEM_PREFIX_LEN (f); ISSLASH (*f); f++)