X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fwctob.m4;h=edc0d79f5e9709fb59a176a4e2a7b6ece64c55a4;hb=43593319b31e6b0175b8eec4433bac744959822d;hp=39270c9d96f6cb4430fd1d43ee10e229893d9b22;hpb=f66b53461406b5ae5cca7c188bd3cf23c82f14bf;p=gnulib.git

diff --git a/m4/wctob.m4 b/m4/wctob.m4
index 39270c9d9..edc0d79f5 100644
--- a/m4/wctob.m4
+++ b/m4/wctob.m4
@@ -1,5 +1,5 @@
-# wctob.m4 serial 4
-dnl Copyright (C) 2008-2009 Free Software Foundation, Inc.
+# wctob.m4 serial 10
+dnl Copyright (C) 2008-2013 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.
@@ -10,13 +10,14 @@ AC_DEFUN([gl_FUNC_WCTOB],
 
   AC_CHECK_FUNCS_ONCE([wctob])
   if test $ac_cv_func_wctob = no; then
+    HAVE_WCTOB=0
     HAVE_DECL_WCTOB=0
-    gl_REPLACE_WCHAR_H
-    AC_LIBOBJ([wctob])
-    gl_PREREQ_WCTOB
   else
+    HAVE_WCTOB=1
 
     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
@@ -27,17 +28,57 @@ 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 $LOCALE_FR != none; then
-          AC_TRY_RUN([
+        case "$host_os" in
+          cygwin*)
+            AC_RUN_IFELSE(
+              [AC_LANG_SOURCE([[
+#include <locale.h>
+/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
+   <wchar.h>.
+   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
+   included before <wchar.h>.  */
+#include <stddef.h>
+#include <stdio.h>
+#include <time.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_RUN_IFELSE(
+            [AC_LANG_SOURCE([[
 #include <locale.h>
 #include <string.h>
+/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
+   <wchar.h>.
+   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
+   included before <wchar.h>.  */
+#include <stddef.h>
+#include <stdio.h>
+#include <time.h>
 #include <wchar.h>
 int main ()
 {
@@ -50,7 +91,7 @@ int main ()
           return 1;
     }
   return 0;
-}],
+}]])],
             [gl_cv_func_wctob_works=yes],
             [gl_cv_func_wctob_works=no],
             [:])
@@ -60,14 +101,10 @@ int main ()
       *yes) ;;
       *) REPLACE_WCTOB=1 ;;
     esac
-    if test $REPLACE_WCTOB = 1; then
-      gl_REPLACE_WCHAR_H
-      AC_LIBOBJ([wctob])
-      gl_PREREQ_WCTOB
-    else
+    if test $REPLACE_WCTOB = 0; then
 
       dnl IRIX 6.5 has the wctob() function but does not declare it.
-      AC_CHECK_DECLS([wctob], [], [], [
+      AC_CHECK_DECLS([wctob], [], [], [[
 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
    <wchar.h>.
    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
@@ -76,10 +113,9 @@ int main ()
 #include <stdio.h>
 #include <time.h>
 #include <wchar.h>
-])
+]])
       if test $ac_cv_have_decl_wctob != yes; then
         HAVE_DECL_WCTOB=0
-        gl_REPLACE_WCHAR_H
       fi
     fi
   fi