X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffseeko.m4;h=0e2836f5321a6fb10337fbc169787776a2c10dd2;hb=a3a01d04e02e926c59ec17e1bb30bc99193f1166;hp=3d79276f7818bd28204dda3f8246583356d4f38b;hpb=cec93e99d19f54c8f310b8290bab9014891530e3;p=gnulib.git

diff --git a/m4/fseeko.m4 b/m4/fseeko.m4
index 3d79276f7..0e2836f53 100644
--- a/m4/fseeko.m4
+++ b/m4/fseeko.m4
@@ -1,5 +1,5 @@
-# fseeko.m4 serial 2
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# fseeko.m4 serial 14
+dnl Copyright (C) 2007-2011 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.
@@ -7,23 +7,62 @@ 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])
-    ])
+
+  AC_CHECK_DECLS_ONCE([fseeko])
+  if test $ac_cv_have_decl_fseeko = no; then
+    HAVE_DECL_FSEEKO=0
+  fi
+
   if test $gl_cv_func_fseeko = no; then
     HAVE_FSEEKO=0
-  elif test $gl_cv_var_stdin_large_offset = no; then
-    gl_REPLACE_FSEEKO
+  else
+    if test $gl_cv_var_stdin_large_offset = no; then
+      REPLACE_FSEEKO=1
+    fi
+    m4_ifdef([gl_FUNC_FFLUSH_STDIN], [
+      gl_FUNC_FFLUSH_STDIN
+      if test $gl_cv_func_fflush_stdin = no; then
+        REPLACE_FSEEKO=1
+      fi
+    ])
   fi
 ])
 
-AC_DEFUN([gl_REPLACE_FSEEKO],
+dnl Tests whether fseeko is available.
+dnl Result is gl_cv_func_fseeko.
+AC_DEFUN([gl_HAVE_FSEEKO],
 [
-  AC_LIBOBJ([fseeko])
-  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
-  REPLACE_FSEEKO=1
+  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])
+    ])
+])
+
+dnl Code shared by fseeko and ftello.  Determine if large files are supported,
+dnl but stdin does not start as a large file by default.
+AC_DEFUN([gl_STDIN_LARGE_OFFSET],
+  [
+    AC_CACHE_CHECK([whether stdin defaults to large file offsets],
+      [gl_cv_var_stdin_large_offset],
+      [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
+[[#if defined __SL64 && defined __SCLE /* cygwin */
+  /* Cygwin 1.5.24 and earlier fail to put stdin in 64-bit mode, making
+     fseeko/ftello needlessly fail.  This bug was fixed in 1.5.25, and
+     it is easier to do a version check than building a runtime test.  */
+# include <cygwin/version.h>
+# if CYGWIN_VERSION_DLL_COMBINED < CYGWIN_VERSION_DLL_MAKE_COMBINED (1005, 25)
+  choke me
+# endif
+#endif]])],
+        [gl_cv_var_stdin_large_offset=yes],
+        [gl_cv_var_stdin_large_offset=no])])
 ])