1# wmemchr.m4 serial 4 2dnl Copyright (C) 2011-2020 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7AC_DEFUN([gl_FUNC_WMEMCHR], 8[ 9 AC_REQUIRE([gl_WCHAR_H_DEFAULTS]) 10 dnl We cannot use AC_CHECK_FUNCS here, because the MSVC 9 header files 11 dnl provide this function as an inline function definition. 12 AC_CACHE_CHECK([for wmemchr], [gl_cv_func_wmemchr], 13 [AC_LINK_IFELSE( 14 [AC_LANG_PROGRAM([[ 15/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before 16 <wchar.h>. 17 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included 18 before <wchar.h>. */ 19#include <stddef.h> 20#include <stdio.h> 21#include <time.h> 22#include <wchar.h> 23]], 24 [[return ! wmemchr ((const wchar_t *) 0, (wchar_t) ' ', 0);]]) 25 ], 26 [gl_cv_func_wmemchr=yes], 27 [gl_cv_func_wmemchr=no]) 28 ]) 29 if test $gl_cv_func_wmemchr = no; then 30 HAVE_WMEMCHR=0 31 fi 32]) 33