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annotate m4/wmemchr.m4 @ 40186:8964917f9574

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author Karl Berry <karl@freefriends.org>
date Mon, 18 Feb 2019 08:02:49 -0800
parents b06060465f09
children
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5d2a7ba94045 wmemchr: Support for MSVC.
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1 # wmemchr.m4 serial 3
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Paul Eggert <eggert@cs.ucla.edu>
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2 dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_WMEMCHR],
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8 [
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9 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
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10 dnl We cannot use AC_CHECK_FUNCS here, because the MSVC 9 header files
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11 dnl provide this function as an inline function definition.
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12 AC_CACHE_CHECK([for wmemchr], [gl_cv_func_wmemchr],
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13 [AC_COMPILE_IFELSE(
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14 [AC_LANG_PROGRAM([[
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15 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
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16 <wchar.h>.
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17 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
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18 before <wchar.h>. */
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19 #include <stddef.h>
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20 #include <stdio.h>
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21 #include <time.h>
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22 #include <wchar.h>
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23 ]],
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24 [[return ! wmemchr ((const wchar_t *) 0, (wchar_t) ' ', 0);]])
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25 ],
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26 [gl_cv_func_wmemchr=yes],
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27 [gl_cv_func_wmemchr=no])
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28 ])
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29 if test $gl_cv_func_wmemchr = no; then
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30 HAVE_WMEMCHR=0
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31 fi
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32 ])