Imported Upstream version 1.23

[tar] / m4 / getcwd.m4

diff --git a/m4/getcwd.m4 b/m4/getcwd.m4
index 6ebe2fce4d03d0119299e4c70d0a6ce2b709ee70..df9c96869fd3646b7b0e27bf0af0a41915088feb 100644 (file)
--- a/m4/getcwd.m4
+++ b/m4/getcwd.m4
@@ -1,53 +1,69 @@
 # getcwd.m4 - check for working getcwd that is compatible with glibc
 
-# Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+# Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2009, 2010 Free Software
+# Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
 # Written by Paul Eggert.
+# serial 2
 
 AC_DEFUN([gl_FUNC_GETCWD_NULL],
   [
    AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
      [gl_cv_func_getcwd_null],
-     [AC_TRY_RUN(
-        [
-#       include <stdlib.h>
-#       include <unistd.h>
-#       ifndef getcwd
-        char *getcwd ();
-#       endif
-        int
-        main ()
-        {
-          if (chdir ("/") != 0)
-            exit (1);
-          else
-            {
-              char *f = getcwd (NULL, 0);
-              exit (! (f && f[0] == '/' && !f[1]));
-            }
-        }],
-       [gl_cv_func_getcwd_null=yes],
-       [gl_cv_func_getcwd_null=no],
-       [gl_cv_func_getcwd_null=no])])
+     [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#        include <unistd.h>
+#        ifndef getcwd
+         char *getcwd ();
+#        endif
+]], [[
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+/* mingw cwd does not start with '/', but getcwd does allocate.  */
+#else
+           if (chdir ("/") != 0)
+             return 1;
+           else
+             {
+               char *f = getcwd (NULL, 0);
+               return ! (f && f[0] == '/' && !f[1]);
+             }
+#endif
+         ]])],
+        [gl_cv_func_getcwd_null=yes],
+        [gl_cv_func_getcwd_null=no],
+        [[
+       case "$host_os" in
+                               # Guess yes on glibc systems.
+         *-gnu*)               gl_cv_func_getcwd_null="guessing yes";;
+                               # Guess yes on Cygwin.
+         cygwin*)              gl_cv_func_getcwd_null="guessing yes";;
+                               # Guess yes on mingw.
+         mingw*)               gl_cv_func_getcwd_null="guessing yes";;
+                               # If we don't know, assume the worst.
+         *)                    gl_cv_func_getcwd_null="guessing no";;
+       esac
+        ]])])
 ])
 
 AC_DEFUN([gl_FUNC_GETCWD],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_GETCWD_NULL])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
 
   gl_abort_bug=no
-  case $gl_cv_func_getcwd_null in
-  yes)
+  case $gl_cv_func_getcwd_null,$host_os in
+  *,mingw*)
+    gl_cv_func_getcwd_path_max=yes;;
+  yes,*)
     gl_FUNC_GETCWD_PATH_MAX
     gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes]);;
   esac
 
   case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_path_max,$gl_abort_bug in
-  yes,yes,no) ;;
+  *yes,yes,no) ;;
   *)
     REPLACE_GETCWD=1
     AC_LIBOBJ([getcwd])