An independent .m4 file for each module.

[gnulib.git] / m4 / chown.m4

diff --git a/m4/chown.m4 b/m4/chown.m4
index 2e35bfd..86c5fc7 100644 (file)
--- a/m4/chown.m4
+++ b/m4/chown.m4
@@ -1,43 +1,24 @@
-#serial 1
+#serial 8
 
 dnl From Jim Meyering.
 dnl Determine whether chown accepts arguments of -1 for uid and gid.
 dnl If it doesn't, arrange to use the replacement function.
 dnl
-dnl If you use this macro in a package, you should
-dnl add the following two lines to acconfig.h:
-dnl  /* Define to rpl_chown if the replacement function should be used.  */
-dnl  #undef chown
-dnl
-
-AC_DEFUN(jm_FUNC_CHOWN,
-[AC_REQUIRE([AC_TYPE_UID_T])dnl
- test -z "$ac_cv_header_unistd_h" \
-   && AC_CHECK_HEADERS(unistd.h)
- AC_CACHE_CHECK([for working chown], jm_cv_func_working_chown,
-  [AC_TRY_RUN([
-#   include <sys/types.h>
-#   include <fcntl.h>
-#   ifdef HAVE_UNISTD_H
-#    include <unistd.h>
-#   endif
 
-    int
-    main ()
-    {
-      char *f = "conftestchown";
-      if (creat (f, 0600) < 0)
-        exit (1);
-      exit (chown (f, (uid_t) -1, (gid_t) -1) == -1 ? 1 : 0);
-    }
-             ],
-            jm_cv_func_working_chown=yes,
-            jm_cv_func_working_chown=no,
-            dnl When crosscompiling, assume chown is broken.
-            jm_cv_func_working_chown=no)
-  ])
-  if test $jm_cv_func_working_chown = no; then
-    LIBOBJS="$LIBOBJS chown.o"
-    AC_DEFINE_UNQUOTED(chown, rpl_chown)
+AC_DEFUN([jm_FUNC_CHOWN],
+[
+  AC_REQUIRE([AC_TYPE_UID_T])dnl
+  AC_REQUIRE([AC_FUNC_CHOWN])
+  if test $ac_cv_func_chown_works = no; then
+    AC_LIBOBJ(chown)
+    AC_DEFINE(chown, rpl_chown,
+      [Define to rpl_chown if the replacement function should be used.])
+    gl_PREREQ_CHOWN
   fi
 ])
+
+# Prerequisites of lib/chown.c.
+AC_DEFUN([gl_PREREQ_CHOWN],
+[
+  AC_CHECK_HEADERS_ONCE(unistd.h)
+])