round: Update regarding AIX.

[gnulib.git] / m4 / wcwidth.m4

diff --git a/m4/wcwidth.m4 b/m4/wcwidth.m4
index df7919b..acceba5 100644 (file)
--- a/m4/wcwidth.m4
+++ b/m4/wcwidth.m4
@@ -1,5 +1,5 @@
-# wcwidth.m4 serial 12
-dnl Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+# wcwidth.m4 serial 16
+dnl Copyright (C) 2006-2010 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.
@@ -7,6 +7,7 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_WCWIDTH],
 [
   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
 
   dnl Persuade glibc <wchar.h> to declare wcwidth().
   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
@@ -33,10 +34,9 @@ AC_DEFUN([gl_FUNC_WCWIDTH],
     HAVE_DECL_WCWIDTH=0
   fi
 
-  if test $ac_cv_func_wcwidth = no; then
-    REPLACE_WCWIDTH=1
-  else
+  if test $ac_cv_func_wcwidth = yes; then
     dnl On MacOS X 10.3, wcwidth(0x0301) (COMBINING ACUTE ACCENT) returns 1.
+    dnl On OSF/1 5.1, wcwidth(0x200B) (ZERO WIDTH SPACE) returns 1.
     dnl This leads to bugs in 'ls' (coreutils).
     AC_CACHE_CHECK([whether wcwidth works reasonably in UTF-8 locales],
       [gl_cv_func_wcwidth_works],
@@ -63,22 +63,32 @@ int wcwidth (int);
 int main ()
 {
   if (setlocale (LC_ALL, "fr_FR.UTF-8") != NULL)
-    if (wcwidth (0x0301) > 0)
+    if (wcwidth (0x0301) > 0 || wcwidth (0x200B) > 0)
       return 1;
   return 0;
 }], [gl_cv_func_wcwidth_works=yes], [gl_cv_func_wcwidth_works=no],
-          [gl_cv_func_wcwidth_works="guessing no"])
+          [
+changequote(,)dnl
+           case "$host_os" in
+                     # Guess yes on glibc systems.
+             *-gnu*) gl_cv_func_wcwidth_works="guessing yes";;
+             *)      gl_cv_func_wcwidth_works="guessing no";;
+           esac
+changequote([,])dnl
+          ])
       ])
     case "$gl_cv_func_wcwidth_works" in
       *yes) ;;
       *no) REPLACE_WCWIDTH=1 ;;
     esac
   fi
-  if test $REPLACE_WCWIDTH = 1; then
+  if test $ac_cv_func_wcwidth != yes || test $REPLACE_WCWIDTH = 1; then
     AC_LIBOBJ([wcwidth])
   fi
-
-  if test $REPLACE_WCWIDTH = 1 || test $HAVE_DECL_WCWIDTH = 0; then
-    WCHAR_H=wchar.h
+  if test $ac_cv_func_wcwidth != yes || test $REPLACE_WCWIDTH = 1 \
+     || test $HAVE_DECL_WCWIDTH = 0; then
+    gl_REPLACE_WCHAR_H
   fi
+  dnl We don't substitute HAVE_WCWIDTH. We assume that if the system does not
+  dnl have the wcwidth function, then it does not declare it.
 ])