51 lines
1.5 KiB
Text
51 lines
1.5 KiB
Text
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# strchrnul.m4 serial 9
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dnl Copyright (C) 2003, 2007, 2009-2021 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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AC_DEFUN([gl_FUNC_STRCHRNUL],
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[
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dnl Persuade glibc <string.h> to declare strchrnul().
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
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AC_CHECK_FUNCS([strchrnul])
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if test $ac_cv_func_strchrnul = no; then
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HAVE_STRCHRNUL=0
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else
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AC_CACHE_CHECK([whether strchrnul works],
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[gl_cv_func_strchrnul_works],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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#include <string.h> /* for strchrnul */
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]], [[const char *buf = "a";
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return strchrnul (buf, 'b') != buf + 1;
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]])],
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[gl_cv_func_strchrnul_works=yes],
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[gl_cv_func_strchrnul_works=no],
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[dnl Cygwin 1.7.9 introduced strchrnul, but it was broken until 1.7.10
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AC_EGREP_CPP([Lucky user],
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[
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#if defined __CYGWIN__
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#include <cygwin/version.h>
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#if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 9)
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Lucky user
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#endif
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#else
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Lucky user
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#endif
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],
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[gl_cv_func_strchrnul_works="guessing yes"],
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[gl_cv_func_strchrnul_works="guessing no"])
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])
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])
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case "$gl_cv_func_strchrnul_works" in
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*yes) ;;
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*) REPLACE_STRCHRNUL=1 ;;
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esac
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fi
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])
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# Prerequisites of lib/strchrnul.c.
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AC_DEFUN([gl_PREREQ_STRCHRNUL], [:])
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