1 # strchrnul.m4 serial 8
2 dnl Copyright (C) 2003, 2007, 2009-2011 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.
7 AC_DEFUN([gl_FUNC_STRCHRNUL],
9 dnl Persuade glibc <string.h> to declare strchrnul().
10 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
12 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
13 AC_REPLACE_FUNCS([strchrnul])
14 if test $ac_cv_func_strchrnul = no; then
18 AC_CACHE_CHECK([whether strchrnul works],
19 [gl_cv_func_strchrnul_works],
20 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
21 #include <string.h> /* for strchrnul */
22 ]], [[const char *buf = "a";
23 return strchrnul(buf, 'b') != buf + 1;
25 [gl_cv_func_strchrnul_works=yes],
26 [gl_cv_func_strchrnul_works=no],
27 [dnl Cygwin 1.7.9 introduced strchrnul, but it was broken until 1.7.10
28 AC_EGREP_CPP([Lucky user],
30 #if defined __CYGWIN__
31 #include <cygwin/version.h>
32 #if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 9)
39 [gl_cv_func_strchrnul_works=yes],
40 [gl_cv_func_strchrnul_works="guessing no"])
43 if test "$gl_cv_func_strchrnul_works" != yes; then
45 AC_LIBOBJ([strchrnul])
50 # Prerequisites of lib/strchrnul.c.
51 AC_DEFUN([gl_PREREQ_STRCHRNUL], [:])