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      1 # wmemchr.m4 serial 5
      2 dnl Copyright (C) 2011-2022 Free Software Foundation, Inc.
      3 dnl This file is free software; the Free Software Foundation
      4 dnl gives unlimited permission to copy and/or distribute it,
      5 dnl with or without modifications, as long as this notice is preserved.
      6 
      7 AC_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           [[#include <wchar.h>
     16           ]],
     17           [[return ! wmemchr ((const wchar_t *) 0, (wchar_t) ' ', 0);]])
     18        ],
     19        [gl_cv_func_wmemchr=yes],
     20        [gl_cv_func_wmemchr=no])
     21     ])
     22   if test $gl_cv_func_wmemchr = no; then
     23     HAVE_WMEMCHR=0
     24   fi
     25 ])
     26