getcwd: on Solaris, work better if ancestors are inaccessible

[gnulib.git] / m4 / wctob.m4

diff --git a/m4/wctob.m4 b/m4/wctob.m4
index 40cb709..3af3cc7 100644 (file)
--- a/m4/wctob.m4
+++ b/m4/wctob.m4
@@ -1,5 +1,5 @@
-# wctob.m4 serial 3
-dnl Copyright (C) 2008 Free Software Foundation, Inc.
+# wctob.m4 serial 5
+dnl Copyright (C) 2008-2010 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.
@@ -17,6 +17,8 @@ AC_DEFUN([gl_FUNC_WCTOB],
   else
 
     dnl Solaris 9 has the wctob() function but it does not work.
+    dnl Cygwin 1.7.2 has the wctob() function but it clobbers caller-owned
+    dnl registers, see <http://cygwin.com/ml/cygwin/2010-05/msg00015.html>.
     AC_REQUIRE([AC_PROG_CC])
     AC_REQUIRE([gt_LOCALE_FR])
     AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
@@ -27,14 +29,35 @@ AC_DEFUN([gl_FUNC_WCTOB],
         dnl is present.
 changequote(,)dnl
         case "$host_os" in
-            # Guess no on Solaris <= 9.
-          solaris2.[1-9] | solaris2.[1-9].*)
+            # Guess no on Solaris <= 9 and Cygwin.
+          solaris2.[1-9] | solaris2.[1-9].* | cygwin*)
             gl_cv_func_wctob_works="guessing no" ;;
             # Guess yes otherwise.
           *) gl_cv_func_wctob_works="guessing yes" ;;
         esac
 changequote([,])dnl
-        if test $LOCALE_FR != none; then
+        case "$host_os" in
+          cygwin*)
+            AC_TRY_RUN([
+#include <locale.h>
+#include <wchar.h>
+
+register long global __asm__ ("%ebx");
+
+int main ()
+{
+  setlocale (LC_ALL, "en_US.UTF-8");
+
+  global = 0x12345678;
+  if (wctob (0x00FC) != -1)
+    return 1;
+  if (global != 0x12345678)
+    return 2;
+  return 0;
+}], [:], [gl_cv_func_wctob_works=no], [:])
+            ;;
+        esac
+        if test "$gl_cv_func_wctob_works" != no && test $LOCALE_FR != none; then
           AC_TRY_RUN([
 #include <locale.h>
 #include <string.h>
@@ -53,7 +76,7 @@ int main ()
 }],
             [gl_cv_func_wctob_works=yes],
             [gl_cv_func_wctob_works=no],
-            [])
+            [:])
         fi
       ])
     case "$gl_cv_func_wctob_works" in