configure.in: Check whether mbstowcs works.

2003-04-24  Krister Walfridsson  <cato@df.lth.se>

        * configure.in: Check whether mbstowcs works.
        * configure, config.in: Regenerate.
        * intl.c: Use HAVE_WORKING_MBSTOWCS.

From-SVN: r66045

gcc/ChangeLog

+2003-04-24  Krister Walfridsson  <cato@df.lth.se>
+
+	* configure.in: Check whether mbstowcs works.
+	* configure, config.in: Regenerate.
+	* intl.c: Use HAVE_WORKING_MBSTOWCS.
+
 2003-04-24  H.J. Lu <hjl@gnu.org>
 
 	* config/ia64/ia64.c (ia64_init_builtins): Add si_ftype_pdi_di_di

gcc/config.in

@@ -397,6 +397,10 @@
 /* Define if you have a working <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
+/* Define this macro if mbstowcs does not crash when its
+   first argument is NULL. */
+#undef HAVE_WORKING_MBSTOWCS
+
 /* Define if printf supports %p. */
 #undef HAVE_PRINTF_PTR
 

gcc/configure.in

@@ -789,6 +789,24 @@ AC_CHECK_FUNCS(times clock dup2 kill getrlimit setrlimit atoll atoq \
 	fwrite_unlocked fprintf_unlocked getrusage nl_langinfo lstat \
         scandir alphasort gettimeofday mbstowcs wcswidth)
 
+if test x$ac_cv_func_mbstowcs = xyes; then
+  AC_CACHE_CHECK(whether mbstowcs works, gcc_cv_func_mbstowcs_works,
+[    AC_TRY_RUN([#include <stdlib.h>
+int main()
+{
+  mbstowcs(0, "", 0);
+  return 0;
+}],
+    gcc_cv_func_mbstowcs_works=yes,
+    gcc_cv_func_mbstowcs_works=no,
+    gcc_cv_func_mbstowcs_works=yes)])
+  if test x$gcc_cv_func_mbstowcs_works = xyes; then
+    AC_DEFINE(HAVE_WORKING_MBSTOWCS, 1,
+  [Define this macro if mbstowcs does not crash when its
+   first argument is NULL.])
+  fi
+fi
+
 AC_CHECK_TYPE(ssize_t, int)
 
 # Try to determine the array type of the second argument of getgroups

gcc/intl.c

@@ -45,7 +45,7 @@ gcc_init_libintl ()
   (void) textdomain ("gcc");
 }
 
-#if defined HAVE_WCHAR_H && defined HAVE_MBSTOWCS && defined HAVE_WCSWIDTH
+#if defined HAVE_WCHAR_H && defined HAVE_WORKING_MBSTOWCS && defined HAVE_WCSWIDTH
 #include <wchar.h>
 
 /* Returns the width in columns of MSGSTR, which came from gettext.