Merge GDB 7.5.1

gdb/gnulib/import/m4/locale-zh.m4

+# locale-zh.m4 serial 12
+dnl Copyright (C) 2003, 2005-2012 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.
+
+dnl From Bruno Haible.
+
+dnl Determine the name of a chinese locale with GB18030 encoding.
+AC_DEFUN([gt_LOCALE_ZH_CN],
+[
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_REQUIRE([AM_LANGINFO_CODESET])
+  AC_CACHE_CHECK([for a transitional chinese locale], [gt_cv_locale_zh_CN], [
+    AC_LANG_CONFTEST([AC_LANG_SOURCE([
+changequote(,)dnl
+#include <locale.h>
+#include <stdlib.h>
+#include <time.h>
+#if HAVE_LANGINFO_CODESET
+# include <langinfo.h>
+#endif
+#include <stdlib.h>
+#include <string.h>
+struct tm t;
+char buf[16];
+int main ()
+{
+  const char *p;
+  /* Check whether the given locale name is recognized by the system.  */
+#if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
+  /* On native Windows, setlocale(category, "") looks at the system settings,
+     not at the environment variables.  Also, when an encoding suffix such
+     as ".65001" or ".54936" is specified, it succeeds but sets the LC_CTYPE
+     category of the locale to "C".  */
+  if (setlocale (LC_ALL, getenv ("LC_ALL")) == NULL
+      || strcmp (setlocale (LC_CTYPE, NULL), "C") == 0)
+    return 1;
+#else
+  if (setlocale (LC_ALL, "") == NULL) return 1;
+#endif
+  /* Check whether nl_langinfo(CODESET) is nonempty and not "ASCII" or "646".
+     On Mac OS X 10.3.5 (Darwin 7.5) in the fr_FR locale, nl_langinfo(CODESET)
+     is empty, and the behaviour of Tcl 8.4 in this locale is not useful.
+     On OpenBSD 4.0, when an unsupported locale is specified, setlocale()
+     succeeds but then nl_langinfo(CODESET) is "646". In this situation,
+     some unit tests fail.
+     On MirBSD 10, when an unsupported locale is specified, setlocale()
+     succeeds but then nl_langinfo(CODESET) is "UTF-8".  */
+#if HAVE_LANGINFO_CODESET
+  {
+    const char *cs = nl_langinfo (CODESET);
+    if (cs[0] == '\0' || strcmp (cs, "ASCII") == 0 || strcmp (cs, "646") == 0
+        || strcmp (cs, "UTF-8") == 0)
+      return 1;
+  }
+#endif
+#ifdef __CYGWIN__
+  /* On Cygwin, avoid locale names without encoding suffix, because the
+     locale_charset() function relies on the encoding suffix.  Note that
+     LC_ALL is set on the command line.  */
+  if (strchr (getenv ("LC_ALL"), '.') == NULL) return 1;
+#endif
+  /* Check whether in a month name, no byte in the range 0x80..0x9F occurs.
+     This excludes the UTF-8 encoding (except on MirBSD).  */
+  t.tm_year = 1975 - 1900; t.tm_mon = 2 - 1; t.tm_mday = 4;
+  if (strftime (buf, sizeof (buf), "%B", &t) < 2) return 1;
+  for (p = buf; *p != '\0'; p++)
+    if ((unsigned char) *p >= 0x80 && (unsigned char) *p < 0xa0)
+      return 1;
+  /* Check whether a typical GB18030 multibyte sequence is recognized as a
+     single wide character.  This excludes the GB2312 and GBK encodings.  */
+  if (mblen ("\203\062\332\066", 5) != 4)
+    return 1;
+  return 0;
+}
+changequote([,])dnl
+      ])])
+    if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
+      case "$host_os" in
+        # Handle native Windows specially, because there setlocale() interprets
+        # "ar" as "Arabic" or "Arabic_Saudi Arabia.1256",
+        # "fr" or "fra" as "French" or "French_France.1252",
+        # "ge"(!) or "deu"(!) as "German" or "German_Germany.1252",
+        # "ja" as "Japanese" or "Japanese_Japan.932",
+        # and similar.
+        mingw*)
+          # Test for the hypothetical native Windows locale name.
+          if (LC_ALL=Chinese_China.54936 LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
+            gt_cv_locale_zh_CN=Chinese_China.54936
+          else
+            # None found.
+            gt_cv_locale_zh_CN=none
+          fi
+          ;;
+        solaris2.8)
+          # On Solaris 8, the locales zh_CN.GB18030, zh_CN.GBK, zh.GBK are
+          # broken. One witness is the test case in gl_MBRTOWC_SANITYCHECK.
+          # Another witness is that "LC_ALL=zh_CN.GB18030 bash -c true" dumps core.
+          gt_cv_locale_zh_CN=none
+          ;;
+        *)
+          # Setting LC_ALL is not enough. Need to set LC_TIME to empty, because
+          # otherwise on Mac OS X 10.3.5 the LC_TIME=C from the beginning of the
+          # configure script would override the LC_ALL setting. Likewise for
+          # LC_CTYPE, which is also set at the beginning of the configure script.
+          # Test for the locale name without encoding suffix.
+          if (LC_ALL=zh_CN LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
+            gt_cv_locale_zh_CN=zh_CN
+          else
+            # Test for the locale name with explicit encoding suffix.
+            if (LC_ALL=zh_CN.GB18030 LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
+              gt_cv_locale_zh_CN=zh_CN.GB18030
+            else
+              # None found.
+              gt_cv_locale_zh_CN=none
+            fi
+          fi
+          ;;
+      esac
+    else
+      # If there was a link error, due to mblen(), the system is so old that
+      # it certainly doesn't have a chinese locale.
+      gt_cv_locale_zh_CN=none
+    fi
+    rm -fr conftest*
+  ])
+  LOCALE_ZH_CN=$gt_cv_locale_zh_CN
+  AC_SUBST([LOCALE_ZH_CN])
+])