chown: detect Solaris and FreeBSD bug

[gnulib.git] / m4 / openat.m4

diff --git a/m4/openat.m4 b/m4/openat.m4
index b824393..6b4f95c 100644 (file)
--- a/m4/openat.m4
+++ b/m4/openat.m4
@@ -1,4 +1,4 @@
-# serial 23
+# serial 25
 # See if we need to use our replacement for Solaris' openat et al functions.
 
 dnl Copyright (C) 2004-2009 Free Software Foundation, Inc.
@@ -27,11 +27,19 @@ AC_DEFUN([gl_FUNC_OPENAT],
   AC_CHECK_FUNCS_ONCE([lchmod])
   AC_REPLACE_FUNCS([fchmodat fstatat mkdirat openat unlinkat])
   AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+  AC_REQUIRE([gl_FUNC_UNLINK])
   case $ac_cv_func_openat+$ac_cv_func_lstat_dereferences_slashed_symlink in
-  yes+yes) ;;
+  yes+yes)
+    # GNU/Hurd has unlinkat, but it has the same bug as unlink.
+    if test $REPLACE_UNLINK = 1; then
+      AC_LIBOBJ([unlinkat])
+      REPLACE_UNLINKAT=1
+    fi ;;
   yes+*)
     # Solaris 9 has *at functions, but uniformly mishandles trailing
     # slash in all of them.
+    AC_LIBOBJ([openat])
+    REPLACE_OPENAT=1
     AC_LIBOBJ([fstatat])
     REPLACE_FSTATAT=1
     AC_LIBOBJ([unlinkat])