use _GL_ATTRIBUTE_CONST and _GL_ATTRIBUTE_PURE

[gnulib.git] / lib / filevercmp.c

diff --git a/lib/filevercmp.c b/lib/filevercmp.c
index f6ed248..b2f309b 100644 (file)
--- a/lib/filevercmp.c
+++ b/lib/filevercmp.c
@@ -26,6 +26,14 @@
 #include <c-ctype.h>
 #include <limits.h>
 
+/* 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
+
 /* Match a file suffix defined by this regular expression:
    /(\.[A-Za-z~][A-Za-z0-9~]*)*$/
    Scan the string *STR and return a pointer to the matching suffix, or
@@ -80,7 +88,7 @@ order (unsigned char c)
    section on the `Version' control field.  This version of the code
    implements that from s5.6.12 of Debian Policy v3.8.0.1
    http://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Version */
-static int
+static int _GL_ATTRIBUTE_PURE
 verrevcmp (const char *s1, size_t s1_len, const char *s2, size_t s2_len)
 {
   size_t s1_pos = 0;