use _GL_ATTRIBUTE_CONST and _GL_ATTRIBUTE_PURE

[pspp] / lib / freadahead.c

diff --git a/lib/freadahead.c b/lib/freadahead.c
index 50ff27ee20a012c8d13c1a43cceaeb3c5098f77c..ecc0ed569bd2b4309bd2c207c40067ee13354da8 100644 (file)
--- a/lib/freadahead.c
+++ b/lib/freadahead.c
@@ -1,5 +1,5 @@
 /* Retrieve information about a FILE stream.
-   Copyright (C) 2007-2010 Free Software Foundation, Inc.
+   Copyright (C) 2007-2011 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
@@ -22,7 +22,15 @@
 #include <stdlib.h>
 #include "stdio-impl.h"
 
-size_t
+/* 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
+
+size_t _GL_ATTRIBUTE_PURE
 freadahead (FILE *fp)
 {
 #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
@@ -48,7 +56,7 @@ freadahead (FILE *fp)
   /* equivalent to
      (fp->_ungetc_count == 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount) */
   return (fp->_rcount > 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount);
-#elif defined _IOERR                /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
+#elif defined _IOERR                /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
   if ((fp_->_flag & _IOWRT) != 0)
     return 0;
   return fp_->_cnt;