time_r: Minor updates.

[gnulib.git] / m4 / ftello.m4

diff --git a/m4/ftello.m4 b/m4/ftello.m4
index f994788..fba549a 100644 (file)
--- a/m4/ftello.m4
+++ b/m4/ftello.m4
@@ -1,5 +1,5 @@
-# ftello.m4 serial 2
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# ftello.m4 serial 6
+dnl Copyright (C) 2007, 2008, 2009, 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.
@@ -9,6 +9,10 @@ AC_DEFUN([gl_FUNC_FTELLO],
   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
   AC_REQUIRE([AC_PROG_CC])
   AC_REQUIRE([gl_STDIN_LARGE_OFFSET])
+
+  dnl Persuade glibc <stdio.h> to declare fseeko().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
   AC_CACHE_CHECK([for ftello], [gl_cv_func_ftello],
     [
       AC_TRY_LINK([#include <stdio.h>], [ftello (stdin);],
@@ -16,7 +20,12 @@ AC_DEFUN([gl_FUNC_FTELLO],
     ])
   if test $gl_cv_func_ftello = no; then
     HAVE_FTELLO=0
-  elif test $gl_cv_var_stdin_large_offset = no; then
+  else
+    if test $gl_cv_var_stdin_large_offset = no; then
+      REPLACE_FTELLO=1
+    fi
+  fi
+  if test $HAVE_FTELLO = 0 || test $REPLACE_FTELLO = 1; then
     gl_REPLACE_FTELLO
   fi
 ])
@@ -24,6 +33,4 @@ AC_DEFUN([gl_FUNC_FTELLO],
 AC_DEFUN([gl_REPLACE_FTELLO],
 [
   AC_LIBOBJ([ftello])
-  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
-  REPLACE_FTELLO=1
 ])