AC_DEFUN([gl_FUNC_GETCWD_NULL],
[
AC_LIBSOURCES([getcwd.c, getcwd.h])
AC_CHECK_HEADERS_ONCE(unistd.h)
AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
[gl_cv_func_getcwd_null],
[AC_TRY_RUN(
[
char *getcwd ();
int
main ()
{
if (chdir ("/") != 0)
exit (1);
else
{
char *f = getcwd (NULL, 0);
exit (! (f && f[0] == '/' && !f[1]));
}
}],
[gl_cv_func_getcwd_null=yes],
[gl_cv_func_getcwd_null=no],
[gl_cv_func_getcwd_null=no])])
])
AC_DEFUN([gl_FUNC_GETCWD],
[
AC_REQUIRE([gl_FUNC_GETCWD_NULL])
case $gl_cv_func_getcwd_null in
yes) gl_FUNC_GETCWD_PATH_MAX;;
esac
case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_path_max in
yes,yes) ;;
*)
AC_LIBOBJ([getcwd])
AC_DEFINE([__GETCWD_PREFIX], [[rpl_]],
[Define to rpl_ if the getcwd replacement function should be used.])
gl_PREREQ_GETCWD;;
esac
])
AC_DEFUN([gl_PREREQ_GETCWD],
[
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([AC_HEADER_DIRENT])
AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])
:
])