Make merging from gnulib a script, not a makefile action.

Putting it in a makefile has some problems with reflection, as
merging from gnulib updates 'configure', which can update the makefile.
Putting it in a standalone script breaks this loop.
* Makefile.in (gnulib_srcdir, $(gnulib_srcdir), DOS_gnulib_comp.m4)
(GNULIB_MODULES, GNULIB_TOOL_FLAGS, sync-from-gnulib):
Remove, moving the actions to the script admin/merge-gnulib.
* admin/merge-gnulib: New script, with actions moved here from
../Makefile.in.

4 files changed, 104 insertions, 37 deletions

diff --git a/ChangeLog b/ChangeLog
index 9cc5e493dd0..f95549d66a3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2012-05-21  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Make merging from gnulib a script, not a makefile action.
+        Putting it in a makefile has some problems with reflection, as
+        merging from gnulib updates 'configure', which can update the makefile.
+        Putting it in a standalone script breaks this loop.
+        * Makefile.in (gnulib_srcdir, $(gnulib_srcdir), DOS_gnulib_comp.m4)
+        (GNULIB_MODULES, GNULIB_TOOL_FLAGS, sync-from-gnulib):
+        Remove, moving the actions to the script admin/merge-gnulib.
+
 2012-05-21  Glenn Morris  <rgm@gnu.org>
 
         * Makefile.in (install-arch-indep, install-doc, install-info)
diff --git a/Makefile.in b/Makefile.in
index 90afd2310dd..f978f19e974 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -309,43 +309,6 @@ src:	lib-src FRC
 # and `leim'.
 lisp leim: src
 
-# Maintainers can put a copy of gnulib into $(gnulib_srcdir).
-gnulib_srcdir = ../gnulib
-$(gnulib_srcdir):
-        git clone git://git.savannah.gnu.org/gnulib.git $@
-
-# A shorter name that satisfies MS-DOS 8+3 constraints.
-DOS_gnulib_comp.m4 = gl-comp.m4
-
-# Update modules from gnulib, for maintainers, who should have it in
-# $(gnulib_srcdir) (relative to $(srcdir) and should have build tools
-# as per $(gnulib_srcdir)/DEPENDENCIES.
-GNULIB_MODULES = \
-  alloca-opt \
-  careadlinkat crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr \
-  dup2 \
-  filemode getloadavg getopt-gnu ignore-value intprops lstat \
-  manywarnings mktime pthread_sigmask readlink \
-  socklen stdarg stdio strftime strtoimax strtoumax symlink sys_stat \
-  warnings
-GNULIB_TOOL_FLAGS = \
- --avoid=msvc-inval --avoid=msvc-nothrow \
- --avoid=raise --avoid=threadlib \
- --conditional-dependencies --import --no-changelog --no-vc-files \
- --makefile-name=gnulib.mk
-sync-from-gnulib: $(gnulib_srcdir)
-        -cd $(srcdir)/m4 && cp $(DOS_gnulib_comp.m4) gnulib-comp.m4
-        cd $(srcdir) && \
-          $(gnulib_srcdir)/gnulib-tool $(GNULIB_TOOL_FLAGS) $(GNULIB_MODULES)
-        cd $(srcdir)/m4 && rm gnulib-cache.m4 warn-on-use.m4
-        cd $(srcdir)/m4 && mv gnulib-comp.m4 $(DOS_gnulib_comp.m4)
-        cp $(gnulib_srcdir)/build-aux/texinfo.tex $(srcdir)/doc/misc
-        cp \
-          $(gnulib_srcdir)/build-aux/move-if-change \
-          $(srcdir)/build-aux
-        cd $(srcdir) && autoreconf -i -I m4
-.PHONY: sync-from-gnulib
-
 # These targets should be "${SUBDIR} without `src'".
 lib lib-src lisp leim: Makefile FRC
         cd $@ && $(MAKE) all $(MFLAGS)                         \
diff --git a/admin/ChangeLog b/admin/ChangeLog
index 55504b3d6f8..86069da7f0b 100644
--- a/admin/ChangeLog
+++ b/admin/ChangeLog
@@ -1,3 +1,9 @@
+2012-05-21  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Make merging from gnulib a script, not a makefile action.
+        * merge-gnulib: New script, with actions moved here from
+        ../Makefile.in.
+
 2012-05-19  Paul Eggert  <eggert@cs.ucla.edu>
 
         * CPP-DEFINES (HAVE_GETDOMAINNAME): Remove.
diff --git a/admin/merge-gnulib b/admin/merge-gnulib
new file mode 100755
index 00000000000..57b71ee4a74
--- /dev/null
+++ b/admin/merge-gnulib
@@ -0,0 +1,88 @@
+#! /bin/sh
+# Merge gnulib sources into Emacs sources.
+# Typical usage:
+#
+#       admin/merge-gnulib
+
+# Copyright 2012 Free Software Foundation, Inc.
+
+# This file is part of GNU Emacs.
+
+# GNU Emacs is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# GNU Emacs is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+# written by Paul Eggert
+
+GNULIB_URL=git://git.savannah.gnu.org/gnulib.git
+
+GNULIB_MODULES='
+  alloca-opt
+  careadlinkat crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512
+  dtoastr dup2
+  filemode getloadavg getopt-gnu ignore-value intprops lstat
+  manywarnings mktime pthread_sigmask readlink
+  socklen stdarg stdio strftime strtoimax strtoumax symlink sys_stat
+  warnings
+'
+
+GNULIB_TOOL_FLAGS='
+  --avoid=msvc-inval --avoid=msvc-nothrow
+  --avoid=raise --avoid=threadlib
+  --conditional-dependencies --import --no-changelog --no-vc-files
+  --makefile-name=gnulib.mk
+'
+
+# The source directory, with a trailing '/'.
+# If empty, the source directory is the working directory.
+src=$2
+case $src in
+  */ | '') ;;
+  *) src=$src/ ;;
+esac
+
+# Gnulib's source directory.
+gnulib_srcdir=${1-$src../gnulib}
+
+case $gnulib_srcdir in
+  -*) src=- ;;
+esac
+case $src in
+  -*)
+    echo >&2 "$0: usage: $0 [GNULIB_SRCDIR [SRCDIR]]
+
+    SRCDIR is the Emacs source directory (default: working directory).
+    GNULIB_SRCDIR is the Gnulib source directory (default: SRCDIR/../gnulib)."
+    exit 1 ;;
+esac
+
+test -x "$src"autogen.sh || {
+  echo >&2 "$0: '${src:-.}' is not an Emacs source directory."
+  exit 1
+}
+
+test -d "$gnulib_srcdir" ||
+git clone -- "$GNULIB_URL" "$gnulib_srcdir" ||
+exit
+
+test -x "$gnulib_srcdir"/gnulib-tool || {
+  echo >&2 "$0: '$gnulib_srcdir' is not a Gnulib source directory."
+  exit 1
+}
+
+cp -- "$src"m4/gl-comp.m4 "$src"m4/gnulib-comp.m4 &&
+"$gnulib_srcdir"/gnulib-tool --dir="$src" $GNULIB_TOOL_FLAGS $GNULIB_MODULES &&
+rm -- "$src"m4/gnulib-cache.m4 "$src"m4/warn-on-use.m4 &&
+mv -- "$src"m4/gnulib-comp.m4 "$src"m4/gl-comp.m4 &&
+cp -- "$gnulib_srcdir"/build-aux/texinfo.tex "$src"doc/misc &&
+cp -- "$gnulib_srcdir"/build-aux/move-if-change "$src"build-aux &&
+autoreconf -i -I m4 -- ${src:+"$src"}