+ AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+ dnl We cannot use AC_CHECK_FUNCS here, because the MSVC 9 header files
+ dnl provide this function as an inline function definition.
+ AC_CACHE_CHECK([for wmemchr], [gl_cv_func_wmemchr],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[
+/* 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>
+]],
+ [[return ! wmemchr ((const wchar_t *) 0, (wchar_t) ' ', 0);]])
+ ],
+ [gl_cv_func_wmemchr=yes],
+ [gl_cv_func_wmemchr=no])
+ ])
+ if test $gl_cv_func_wmemchr = no; then
+ HAVE_WMEMCHR=0
+ fi