* Makefile (subdir-target-args): New variable.

($(all-subdirs-targets)): Use it in place of -C option.
	* Rules: Use $(..) instead of ../ if it's already defined.
	* Makeconfig (subdir-srcdirs): New variable.
	* csu/Makefile (all-Banner-files): Use it.

	* configure.in (--enable-add-ons): Set to "yes" by default.
	Handle absolute add-on directory names when looking for configure
	fragments.  Also look for sysdeps/*/preconfigure fragments in add-ons.
	Require add-on configure to set $libc_add_on_canonical, use
	that in $add_ons_sfx.  Substitute add_on_subdirs with computed list
	of subdir names each add-on configure set in libc_add_on_subdirs.
	* configure: Regenerated.
	* Makefile (%/preconfigure: %/preconfigure.in): New pattern rule.
	* config.make.in (add-on-subdirs): New substituted variable.
	* Makeconfig (all-subdirs): Include $(add-on-subdirs).
	Remove $(add-ons), $(sysdep-subdirs).
	Don't filter out $(sysdep-inhibit-subdirs).
	($(common-objpfx)sysd-dirs): Target removed.  Don't include it.
	($(common-objpfx)sysd-sorted): Rewritten to feed Depend and Subdirs
	files together to gen-sorted.awk, and $(subdirs) via -v.
	(subdirs): Remove magic reordering for mach and hurd.
	* scripts/gen-sorted.awk: Use subdirs from command line.
	Process Subdirs and Depend files directly.
	Let Subdirs files use "first dir" and "inhibit dir".
	Always move elf to the end of the list.
	* hurd/Depend: New file.
	* sysdeps/mach/Subdirs: Use "first mach".

	* Makefile (dist-separate): Remove linuxthreads.
	(dist-separate-linuxthreads): Variable removed.
	(glibc-%.tar rule): Use $(sysdeps-add-ons).

	* Makerules ($(common-objpfx)Versions.v.i): Use $(subdirs),
	not $(all-subdirs).
	(sysdep-makefiles): Use $(sysdirs).
	(sysdirs): Remove export.
	($(+sysdir_pfx)sysd-rules): Handle absolute directory names in
	$(config-sysdirs).
	(+sysdir_pfx): Variable removed.
	(sysd-rules): Use $(common-objpfx) in place of it.
	(sysdirs): Variable moved to ...
	* Makeconfig (sysdirs): ... here.
	Handle absolute directory names in $(config-sysdirs).
	(full_config_sysdirs): Variable removed.
	* csu/Makefile: Use $(sysdirs) in vpath directive.
	* math/Makefile (ulps-file): Use $(sysdirs).
	* sysdeps/gnu/Makefile (errlist-c): Likewise.
	($(objpfx)errlist-compat.c): Likewise.
	* Makeconfig (all-Subdirs-files): Likewise.
	($(common-objpfx)config.status): Likewise.

	* configure.in (sysnames): Handle absolute add-on directory names.
	(sysdeps_add_ons): New variable, AC_SUBST it.
	Compute which add-ons contributed sysdeps directories.
	* configure: Regenerated.
	* config.make.in (sysdeps-add-ons): New substituted variable.
	* Makerules (+sysdep_dirs, +sysdep-includes): Variables moved ...
	* Makeconfig: ... to here.
	(+sysdep_dirs): Append $(sysdeps-add-ons) here.
	(+includes): Remove $(objpfx) include, already in $(+sysdep_dirs).
	Remove $(includes).
	(sysdep-makeconfigs): Use $(+sysdep_dirs).
	($(common-objpfx)shlib-versions.v.i): Likewise.

	* Makeconfig: Remove hair to set Makeconfig-add-on.

	* sysdeps/unix/Makefile (sysdirs): Remove export.
	(asm_CPP): Variable removed.
	($(common-objpfx)sysd-syscalls): Pass them directly for the script.

	* sysdeps/posix/Makefile: New file.
	* Makerules (L_tmpnam, TMP_MAX, L_ctermid, L_cuserid): Set non-posix
	values here with ?=.

	* stdlib/gen-mpn-copy: File removed.
	* stdlib/Makefile (distribute): Remove it.
	* configure.in: Don't grok --with-gmp.
	* configure: Regenerated.

	* configure.in (libc_cv_idn): Don't check it; libidn/configure does it.
	* configure: Regenerated.

	* bare: Directory removed, saved in ports repository.

scripts/gen-sorted.awk

@@ -5,23 +5,101 @@
 # Written by Ulrich Drepper <drepper@cygnus.com>, 1998.
 
 BEGIN {
-  cnt = 0
+  cnt = split(subdirs, all) + 1
   dnt = 0
 }
+
+# Let input files have comments.
+{ sub(/[ 	]*#.*$/, "") }
+NF == 0 { next }
+
 {
-  if ($1 ~ /depend/) {
-    from[dnt] = $2
-    to[dnt] = $3
-    ++dnt
-  } else {
-    all[cnt++] = $1
-  }
+  subdir = type = FILENAME;
+  sub(/^.*\//, "", type);
+  sub(/\/[^/]+$/, "", subdir);
+  sub(/^.*\//, "", subdir);
+  thisdir = "";
 }
+
+type == "Depend" && NF == 1 {
+  from[dnt] = subdir;
+  to[dnt] = $1;
+  ++dnt;
+  next
+}
+
+type == "Subdirs" && NF == 1 { thisdir = $1 }
+
+type == "Subdirs" && NF == 2 && $1 == "first" {
+  thisdir = $2;
+  # Make the first dir in the list depend on this one.
+  from[dnt] = all[1];
+  to[dnt] = thisdir;
+  ++dnt;
+}
+
+type == "Subdirs" && NF == 2 && $1 == "inhibit" {
+  inhibit[$2] = subdir;
+  next
+}
+
+type == "Subdirs" && thisdir {
+  all[cnt++] = thisdir;
+
+  if (FILENAME ~ (srcpfx ? /^\.\.\/sysdeps\// : /^sysdeps\//) \
+      || system("test -d " srcpfx thisdir) == 0) {
+    # This Subdirs file is in the main source tree,
+    # or this subdirectory exists in the main source tree.
+    this_srcdir = srcpfx thisdir
+  }
+  else {
+    # The Subdirs file comes from an add-on that should have the subdirectory.
+    dir = FILENAME;
+    do
+      sub(/\/[^/]+$/, "", dir);
+    while (dir !~ /\/sysdeps$/);
+    sub(/\/sysdeps$/, "", dir);
+    if (system("test -d " dir "/" thisdir) == 0)
+      dir = dir "/" thisdir;
+    else {
+      sub(/\/[^/]+$/, "", dir);
+      if (system("test -d " dir "/" thisdir) == 0)
+        dir = dir "/" thisdir;
+      else {
+	print FILENAME ":" FNR ":", "cannot find", thisdir > "/dev/stderr";
+	exit 2
+      }
+    }
+    file = dir "/Depend";
+    if (srcpfx)
+      sub(/^\.\.\//, "", dir);
+    if (dir !~ /^\/.*$/)
+      dir = "$(..)" dir;
+    print thisdir "-srcdir", ":=", dir;
+  }
+  file = this_srcdir "/Depend";
+  if (system("test -f " file) == 0) {
+    ARGV[ARGC++] = file;
+    # Emit a dependency on the implicitly-read file.
+    if (srcpfx)
+      sub(/^\.\.\//, "", file);
+    if (file !~ /^\/.*$/)
+      file = "$(..)" file;
+    print "$(common-objpfx)sysd-sorted:", "$(wildcard", file ")";
+  }
+  next
+}
+
+{
+  print FILENAME ":" FNR ":", "what type of file is this?" > "/dev/stderr";
+  exit 2
+}
+
 END {
   do {
     moved = 0
     for (i = 0; i < dnt; ++i) {
-      for (j = 0; j < cnt; ++j) {
+      for (j = 1; j < cnt; ++j) {
 	if (all[j] == from[i]) {
 	  for (k = j + 1; k < cnt; ++k) {
 	    if (all[k] == to[i]) {
@@ -42,11 +120,20 @@ END {
 	break
       }
     }
-  } while (moved)
+  } while (moved);
 
-  printf "sorted-subdirs = "
-  for (i = 0; i < cnt; ++i) {
-    printf "%s ", all[i];
+  # Make sure we list "elf" last.
+  saw_elf = 0;
+  printf "sorted-subdirs :=";
+  for (i = 1; i < cnt; ++i) {
+    if (all[i] in inhibit)
+      continue;
+    if (all[i] == "elf")
+      saw_elf = 1;
+    else
+      printf " %s", all[i];
   }
-  printf "\n"
+  printf "%s\n", saw_elf ? " elf" : "";
+
+  print "sysd-sorted-done := t"
 }