getcwd: port to mingw

[gnulib.git] / m4 / getcwd.m4

diff --git a/m4/getcwd.m4 b/m4/getcwd.m4
index c252491..4b8c4c6 100644 (file)
--- a/m4/getcwd.m4
+++ b/m4/getcwd.m4
@@ -1,56 +1,72 @@
 # getcwd.m4 - check for working getcwd that is compatible with glibc
 
-# Copyright (C) 2001, 2003, 2004 Free Software Foundation, Inc.
+# Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2009 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_CHECK_HEADERS_ONCE(unistd.h)
    AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
      [gl_cv_func_getcwd_null],
-     [AC_TRY_RUN(
-        [
-#       include <stdlib.h>
-#       ifdef HAVE_UNISTD_H
-#        include <unistd.h>
-#       endif
+     [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#       include <unistd.h>
 #       ifndef getcwd
         char *getcwd ();
 #       endif
-        int
-        main ()
-        {
+]], [[
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+/* mingw cwd does not start with '/', but getcwd does allocate.  */
+#else
           if (chdir ("/") != 0)
-            exit (1);
+            return 1;
           else
             {
               char *f = getcwd (NULL, 0);
-              exit (! (f && f[0] == '/' && !f[1]));
+              return ! (f && f[0] == '/' && !f[1]);
             }
-        }],
+#endif
+        ]])],
        [gl_cv_func_getcwd_null=yes],
        [gl_cv_func_getcwd_null=no],
-       [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
 
-  case $gl_cv_func_getcwd_null in
-  yes) gl_FUNC_GETCWD_PATH_MAX;;
+  gl_abort_bug=no
+  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 in
-  yes,yes) ;;
+  case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_path_max,$gl_abort_bug in
+  *yes,yes,no) ;;
   *)
+    REPLACE_GETCWD=1
     AC_LIBOBJ([getcwd])
-    AC_DEFINE([__GETCWD_PREFIX], [[rpl_]],
-      [Define to rpl_ if the getcwd replacement function should be used.])
     gl_PREREQ_GETCWD;;
   esac
 ])
@@ -59,8 +75,6 @@ AC_DEFUN([gl_FUNC_GETCWD],
 AC_DEFUN([gl_PREREQ_GETCWD],
 [
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_REQUIRE([AC_HEADER_DIRENT])
   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])
-  AC_CHECK_HEADERS_ONCE(fcntl.h)
   :
 ])