stat: Update regarding AIX.

[gnulib.git] / m4 / fseeko.m4

diff --git a/m4/fseeko.m4 b/m4/fseeko.m4
index 40be63b..b97df53 100644 (file)
--- a/m4/fseeko.m4
+++ b/m4/fseeko.m4
@@ -1,5 +1,5 @@
-# fseeko.m4 serial 3
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# fseeko.m4 serial 9
+dnl Copyright (C) 2007-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -7,24 +7,44 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_FSEEKO],
 [
   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
-  AC_REQUIRE([AC_PROG_CC])
+  AC_REQUIRE([gl_HAVE_FSEEKO])
   AC_REQUIRE([gl_STDIN_LARGE_OFFSET])
-  AC_CACHE_CHECK([for fseeko], [gl_cv_func_fseeko],
-    [
-      AC_TRY_LINK([#include <stdio.h>], [fseeko (stdin, 0, 0);],
-       [gl_cv_func_fseeko=yes], [gl_cv_func_fseeko=no])
-    ])
+
   if test $gl_cv_func_fseeko = no; then
     HAVE_FSEEKO=0
     gl_REPLACE_FSEEKO
-  elif test $gl_cv_var_stdin_large_offset = no; then
-    gl_REPLACE_FSEEKO
+  else
+    if test $gl_cv_var_stdin_large_offset = no; then
+      gl_REPLACE_FSEEKO
+    fi
   fi
 ])
 
+dnl Tests whether fseeko is available.
+dnl Result is gl_cv_func_fseeko.
+AC_DEFUN([gl_HAVE_FSEEKO],
+[
+  AC_REQUIRE([AC_PROG_CC])
+
+  dnl Persuade glibc <stdio.h> to declare fseeko().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_CACHE_CHECK([for fseeko], [gl_cv_func_fseeko],
+    [
+      AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
+]], [fseeko (stdin, 0, 0);])],
+        [gl_cv_func_fseeko=yes], [gl_cv_func_fseeko=no])
+    ])
+])
+
 AC_DEFUN([gl_REPLACE_FSEEKO],
 [
-  AC_LIBOBJ([fseeko])
   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
-  REPLACE_FSEEKO=1
+  AC_REQUIRE([gl_HAVE_FSEEKO])
+  if test $gl_cv_func_fseeko = yes; then
+    REPLACE_FSEEKO=1
+  fi
+  AC_LIBOBJ([fseeko])
+  dnl If we are also using the fseek module, then fseek needs replacing, too.
+  m4_ifdef([gl_REPLACE_FSEEK], [gl_REPLACE_FSEEK])
 ])