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#serial 2
# Use the replacement ftw.c if the one in the C library is inadequate or buggy.
# For now, we always use the code in lib/ because libc doesn't have the FTW_DCH
# or FTW_DCHP that we need. Arrange to use lib/ftw.h. And since that
# implementation uses tsearch.c/tdestroy, add tsearch.o to the list of
# objects and arrange to use lib/search.h if necessary.
# From Jim Meyering
AC_DEFUN([AC_FUNC_FTW],
[
# prerequisites
AC_REQUIRE([AC_HEADER_STAT])
AC_REQUIRE([jm_FUNC_LSTAT])
AC_REQUIRE([AC_HEADER_DIRENT])
AC_CHECK_HEADERS(sys/param.h)
AC_CHECK_DECLS([stpcpy])
# In the event that we have to use the replacement ftw.c,
# see if we'll also need the replacement tsearch.c.
AC_CHECK_FUNC([tdestroy], , [need_tdestroy=1])
AC_CACHE_CHECK([for ftw/FTW_CHDIR that informs callback of failed chdir],
ac_cv_func_ftw_working,
[
# The following test would fail prior to glibc-2.3.2, because `depth'
# would be 2 rather than 4. Of course, now that we require FTW_DCH
# and FTW_DCHP, this test fails even with GNU libc's fixed ftw.
mkdir -p conftest.dir/a/b/c
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <string.h>
#include <stdlib.h>
#include <ftw.h>
static char *_f[] = { "conftest.dir", "conftest.dir/a",
"conftest.dir/a/b", "conftest.dir/a/b/c" };
static char **p = _f;
static int depth;
static int
cb (const char *file, const struct stat *sb, int file_type, struct FTW *info)
{
if (strcmp (file, *p++) != 0)
exit (1);
++depth;
return 0;
}
int
main ()
{
/* Require these symbols, too. */
int d1 = FTW_DCH;
int d2 = FTW_DCHP;
int err = nftw ("conftest.dir", cb, 30, FTW_PHYS | FTW_MOUNT | FTW_CHDIR);
exit ((err == 0 && depth == 4) ? 0 : 1);
}
]])],
[ac_cv_func_ftw_working=yes],
[ac_cv_func_ftw_working=no],
[ac_cv_func_ftw_working=no])])
rm -rf conftest.dir
if test $ac_cv_func_ftw_working = no; then
AC_LIBOBJ([ftw])
AC_CONFIG_LINKS([$ac_config_libobj_dir/ftw.h:$ac_config_libobj_dir/ftw_.h])
# Add tsearch.o IFF we have to use the replacement ftw.c.
if test -n "$need_tdestroy"; then
AC_LIBOBJ([tsearch])
# Link search.h to search_.h if we use the replacement tsearch.c.
AC_CONFIG_LINKS(
[$ac_config_libobj_dir/search.h:$ac_config_libobj_dir/search_.h])
fi
fi
])# AC_FUNC_FTW
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