75 lines
2.3 KiB
Plaintext
75 lines
2.3 KiB
Plaintext
# wmemcmp.m4
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# serial 6
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dnl Copyright (C) 2011-2024 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl This file is offered as-is, without any warranty.
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AC_DEFUN([gl_FUNC_WMEMCMP],
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[
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AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST])
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dnl We cannot use AC_CHECK_FUNCS here, because the MSVC 9 header files
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dnl provide this function as an inline function definition.
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AC_CACHE_CHECK([for wmemcmp], [gl_cv_func_wmemcmp],
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[AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <wchar.h>
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]],
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[[return ! wmemcmp ((const wchar_t *) 0, (const wchar_t *) 0, 0);]])
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],
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[gl_cv_func_wmemcmp=yes],
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[gl_cv_func_wmemcmp=no])
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])
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if test $gl_cv_func_wmemcmp = no; then
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HAVE_WMEMCMP=0
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else
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AC_CACHE_CHECK([whether wmemcmp works for all wide characters],
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[gl_cv_func_wmemcmp_works],
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[AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#include <wchar.h>
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int main ()
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{
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wchar_t a = (wchar_t) 0x76547654;
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wchar_t b = (wchar_t) 0x9abc9abc;
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int cmp = wmemcmp (&a, &b, 1);
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if ((wchar_t)-1 < 0)
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return !(cmp > 0);
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else
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return !(cmp < 0);
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}
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]])
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],
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[gl_cv_func_wmemcmp_works=yes],
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[gl_cv_func_wmemcmp_works=no],
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[case "$host_on" in
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# Guess no on glibc versions < 2.15.
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*-gnu* | gnu*)
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AC_EGREP_CPP([Unlucky],
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[
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#include <features.h>
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#ifdef __GNU_LIBRARY__
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#if (__GLIBC__ == 2 && __GLIBC_MINOR__ < 15)
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Unlucky GNU user
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#endif
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#endif
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],
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[gl_cv_func_wmemcmp_works="guessing no"],
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[gl_cv_func_wmemcmp_works="guessing yes"])
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;;
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# Guess no on musl systems.
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*-musl* | midipix*) gl_cv_func_wmemcmp_works="guessing no" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_wmemcmp_works="$gl_cross_guess_normal" ;;
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esac
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])
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])
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case "$gl_cv_func_wmemcmp_works" in
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*yes) ;;
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*) REPLACE_WMEMCMP=1 ;;
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esac
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fi
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])
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