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Re: test results on Cygwin
From: |
Bruno Haible |
Subject: |
Re: test results on Cygwin |
Date: |
Sun, 2 May 2010 13:15:45 +0200 |
User-agent: |
KMail/1.9.9 |
Hi,
On 2010-04-05 I reported:
> A simplified test case is attached. It crashes when optimized with -O2
> and works fine without optimization:
> ...
> The same behaviour also occurs when the test case uses the gnulib replacement
> of mbsrtowcs. Therefore I think it's not a bug in Cygwin's mbsrtowcs function.
It turned out to be a very nasty bug in Cygwin's wctob() function. Reported at
<http://cygwin.com/ml/cygwin/2010-05/msg00015.html>.
This adds a workaround, so that the gnulib tests for Cygwin now pass.
2010-05-02 Bruno Haible <address@hidden>
wctob: Work around nasty Cygwin 1.7.2 bug.
* m4/wctob.m4 (gl_FUNC_WCTOB): Detect the Cygwin bug.
* doc/posix-functions/wctob.texi: Mention the Cygwin bug.
--- doc/posix-functions/wctob.texi.orig Sun May 2 13:14:53 2010
+++ doc/posix-functions/wctob.texi Sun May 2 12:45:50 2010
@@ -12,6 +12,9 @@
This function is missing on some platforms:
HP-UX 11.00, IRIX 5.3, Solaris 2.6, mingw, Interix 3.5.
@item
+This function clobbers caller-owned registers on some platforms:
+Cygwin 1.7.2.
address@hidden
This function does not work on some platforms:
Solaris 9.
@item
--- m4/wctob.m4.orig Sun May 2 13:14:53 2010
+++ m4/wctob.m4 Sun May 2 13:14:38 2010
@@ -1,4 +1,4 @@
-# wctob.m4 serial 4
+# 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,
@@ -17,6 +17,8 @@
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 @@
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>
- Re: test results on Cygwin,
Bruno Haible <=