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-rw-r--r--string/string.h13
1 files changed, 11 insertions, 2 deletions
diff --git a/string/string.h b/string/string.h
index 409fa99283..8f863b887c 100644
--- a/string/string.h
+++ b/string/string.h
@@ -234,8 +234,17 @@ extern char *rindex __P ((__const char *__s, int __c));
 
 /* Return the position of the first bit set in I, or 0 if none are set.
    The least-significant bit is position 1, the most-significant 32.  */
-extern int __ffs __P ((int __i));
-extern int ffs __P ((int __i));
+extern int __ffs __P ((int __i)) __attribute__ ((const));
+extern int ffs __P ((int __i)) __attribute__ ((const));
+
+/* The following two functions are non-standard but necessary for non-32 bit
+   platforms.  */
+# ifdef	__USE_GNU
+extern int ffsl __P ((long int __l)) __attribute__ ((const));
+#  ifdef __GNUC__
+extern int ffsll __P ((long long int __ll)) __attribute__ ((const));
+#  endif
+# endif
 
 /* Compare S1 and S2, ignoring case.  */
 extern int __strcasecmp __P ((__const char *__s1, __const char *__s2));