[PATCH] Allow building GIT in a different directory from the source directory

@@ -1,6 +1,6 @@
 MAN1_TXT= \
-	$(filter-out $(addsuffix .txt, $(ARTICLES) $(SP_ARTICLES)), \
-		$(wildcard git-*.txt)) \
+	$(filter-out $(foreach i, $(ARTICLES) $(SP_ARTICLES), $(here-srcdir)/$(i).txt), \
+		$(wildcard $(here-srcdir)/git-*.txt)) \
 	gitk.txt
 MAN7_TXT=git.txt
 

@@ -33,8 +33,16 @@ # DESTDIR=
 
 INSTALL?=install
 
--include ../config.mak.autogen
+ifndef srcdir
+srcdir=..
+endif
+
+
+here-srcdir=$(srcdir)/Documentation
 
+ASCIIDOC_CONF=$(here-srcdir)/asciidoc.conf
+
+-include ../config.mak.autogen
 #
 # Please note that there is a minor bug in asciidoc.
 # The version after 6.0.3 _will_ include the patch found here:

@@ -63,9 +71,9 @@ install: man
 #
 # Determine "include::" file references in asciidoc files.
 #
-doc.dep : $(wildcard *.txt) build-docdep.perl
+doc.dep : $(wildcard $(here-srcdir)/*.txt) build-docdep.perl
 	rm -f $@+ $@
-	perl ./build-docdep.perl >$@+
+	perl $(lastword $^) >$@+
 	mv $@+ $@
 
 -include doc.dep

@@ -80,35 +88,35 @@ clean:
 	rm -f *.xml *.html *.1 *.7 howto-index.txt howto/*.html doc.dep README
 
 %.html : %.txt
-	asciidoc -b xhtml11 -d manpage -f asciidoc.conf $<
+	asciidoc -b xhtml11 -d manpage -f $(ASCIIDOC_CONF) $<
 
 %.1 %.7 : %.xml
-	xmlto -m callouts.xsl man $<
+	xmlto --searchpath $(here-srcdir)/  -m callouts.xsl man $<
 
 %.xml : %.txt
-	asciidoc -b docbook -d manpage -f asciidoc.conf $<
+	asciidoc -b docbook -d manpage -f $(ASCIIDOC_CONF) $<
 
 git.html: git.txt README
 
 glossary.html : glossary.txt sort_glossary.pl
 	cat $< | \
-	perl sort_glossary.pl | \
+	perl $(lastword $^) | \
 	asciidoc -b xhtml11 - > glossary.html
 
-howto-index.txt: howto-index.sh $(wildcard howto/*.txt)
+howto-index.txt: howto-index.sh $(wildcard $(here-srcdir)/howto/*.txt)
 	rm -f $@+ $@
-	sh ./howto-index.sh $(wildcard howto/*.txt) >$@+
+	sh $^ >$@+
 	mv $@+ $@
 
 $(patsubst %,%.html,$(ARTICLES)) : %.html : %.txt
-	asciidoc -b xhtml11 $*.txt
+	asciidoc -b xhtml11 $<
 
 WEBDOC_DEST = /pub/software/scm/git/docs
 
-$(patsubst %.txt,%.html,$(wildcard howto/*.txt)): %.html : %.txt
+$(patsubst %.txt,%.html,$(wildcard $(here-srcdir)/howto/*.txt)): %.html : %.txt
 	rm -f $@+ $@
 	sed -e '1,/^$$/d' $< | asciidoc -b xhtml11 - >$@+
 	mv $@+ $@
 
 install-webdoc : html
-	sh ./install-webdoc.sh $(WEBDOC_DEST)
+	sh $(here-srcdir)/install-webdoc.sh $(WEBDOC_DEST)

@@ -21,6 +21,13 @@ set up install paths (via config.mak.aut
 	$ make all doc ;# as yourself
 	# make install install-doc ;# as root
 
+When using configure, git may be built in a separate directory. Use
+
+	$ mkdir builddir
+	$ cd builddir
+	$ GIT-SOURCE-DIR/configure [options]
+	$ make
+	# make install                          
 
 Issues of note:
 

@@ -97,7 +97,7 @@ # MakeMaker (e.g. using ActiveState unde
 #
 
 GIT-VERSION-FILE: .FORCE-GIT-VERSION-FILE
-	@$(SHELL_PATH) ./GIT-VERSION-GEN
+	@$(SHELL_PATH) $(srcdir)/GIT-VERSION-GEN
 -include GIT-VERSION-FILE
 
 uname_S := $(shell sh -c 'uname -s 2>/dev/null || echo not')

@@ -110,15 +110,20 @@ # CFLAGS and LDFLAGS are for the users t
 
 CFLAGS = -g -O2 -Wall
 LDFLAGS =
-ALL_CFLAGS = $(CFLAGS)
+ALL_CFLAGS = $(CFLAGS) -I.
 ALL_LDFLAGS = $(LDFLAGS)
 STRIP ?= strip
 
 prefix = $(HOME)
 bindir = $(prefix)/bin
 gitexecdir = $(bindir)
-template_dir = $(prefix)/share/git-core/templates/
-# DESTDIR=
+datadir = $(prefix)/share
+GIT_datadir = $(datadir)/git-core
+template_dir = $(GIT_datadir)/templates/
+srcdir = .
+
+# this is usually set on the make command line.
+DESTDIR=
 
 # default configuration for gitweb
 GITWEB_CONFIG = gitweb_config.perl

@@ -595,8 +600,8 @@ git-merge-recur$X: git-merge-recursive$X
 $(BUILT_INS): git$X
 	rm -f $@ && ln git$X $@
 
-common-cmds.h: Documentation/git-*.txt
-	./generate-cmdlist.sh > $@+
+common-cmds.h: $(wildcard $(srcdir)/Documentation/git-*.txt)
+	$(srcdir)/generate-cmdlist.sh $(srcdir)/Documentation/ > $@+
 	mv $@+ $@
 
 $(patsubst %.sh,%,$(SCRIPT_SH)) : % : %.sh

@@ -605,7 +610,7 @@ common-cmds.h: Documentation/git-*.txt
 	    -e 's|@@PERL@@|$(PERL_PATH_SQ)|g' \
 	    -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
 	    -e 's/@@NO_CURL@@/$(NO_CURL)/g' \
-	    $@.sh >$@+
+	    $^ >$@+
 	chmod +x $@+
 	mv $@+ $@
 

@@ -626,7 +631,7 @@ perl/perl.mak: GIT-CFLAGS
 	    -e '}' \
 	    -e 's|@@INSTLIBDIR@@|'"$$INSTLIBDIR"'|g' \
 	    -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
-	    $@.perl >$@+
+	    $^ >$@+
 	chmod +x $@+
 	mv $@+ $@
 

@@ -670,7 +675,7 @@ git-instaweb: git-instaweb.sh gitweb/git
 	    -e '/@@GITWEB_CGI@@/d' \
 	    -e '/@@GITWEB_CSS@@/r gitweb/gitweb.css' \
 	    -e '/@@GITWEB_CSS@@/d' \
-	    $@.sh > $@+
+	    $< > $@+
 	chmod +x $@+
 	mv $@+ $@
 

@@ -10,17 +10,16 @@ #INSTALL = @INSTALL@		# needs install-sh
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 bindir = @bindir@
-#gitexecdir = @libexecdir@/git-core/
+mandir=@mandir@
+
+## unused, but necessary for some autoconf versions (?)
 datarootdir = @datarootdir@
-template_dir = @datadir@/git-core/templates/
 
-mandir=@mandir@
 
 srcdir = @srcdir@
-VPATH = @srcdir@
 
 export exec_prefix mandir
-export srcdir VPATH
+export srcdir 
 
 NEEDS_SSL_WITH_CRYPTO=@NEEDS_SSL_WITH_CRYPTO@
 NO_OPENSSL=@NO_OPENSSL@

@@ -5,6 +5,7 @@ AC_PREREQ(2.59)
 AC_INIT([git], [@@GIT_VERSION@@], [git@vger.kernel.org])
 
 AC_CONFIG_SRCDIR([git.c])
+srcdir=`cd $srcdir && pwd`
 
 config_file=config.mak.autogen
 config_append=config.mak.append

@@ -334,6 +335,39 @@ ## Output files
 AC_CONFIG_FILES(["${config_file}":"${config_in}":"${config_append}"])
 AC_OUTPUT
 
+if test "$srcdir" != "."; then
+
+  ## if we're building in another directory
+  ## we need to set it up like the sourcedir
+  for d in `cd $srcdir &&  find . -type d -print | grep -v '\.git'` ;
+  do
+    if test ! -d  $d ; then
+      echo creating $d 
+      mkdir $d
+    fi
+
+    if test -f $srcdir/$d/Makefile ; then
+
+      dnl [[]] is to keep m4 happy
+      depth=`echo $d/ | sed -e 's!^\./!!g' -e 's![[^/]]*/!../!g'`
+      echo creating $d/Makefile
+
+      if test "$depth"  = "";  then
+        INCLUDE_AUTOGEN="include config.mak.autogen" ;
+      else
+        INCLUDE_AUTOGEN="srcdir=$srcdir" 
+      fi
+ 
+      cat << EOF > $d/Makefile
+$INCLUDE_AUTOGEN
+VPATH = $srcdir/$d
+export VPATH
+include $srcdir/$d/Makefile
+EOF
+
+    fi 
+  done
+fi
 
 ## Cleanup
 rm -f "${config_append}"

@@ -47,6 +47,6 @@ do
             x
             s/.*git-'"$cmd"' - \(.*\)/  {"'"$cmd"'", "\1"},/
 	    p
-     }' "Documentation/git-$cmd.txt"
+     }' "$1/git-$cmd.txt"
 done
 echo "};"

@@ -28,6 +28,10 @@ instdir_SQ = $(subst ','\'',$(prefix)/li
 	echo instlibdir: >> $@
 	echo '	echo $(instdir_SQ)' >> $@
 else
+
+PERL_SRCDIR=$(srcdir)/perl
+export PERL_SRCDIR
+
 $(makfile): Makefile.PL ../GIT-CFLAGS
 	'$(PERL_PATH_SQ)' $< PREFIX='$(prefix_SQ)'
 endif

@@ -8,21 +8,31 @@ instlibdir:
 MAKE_FRAG
 }
 
-my %pm = ('Git.pm' => '$(INST_LIBDIR)/Git.pm');
+
+$src_prefix = "";
+if (defined ($ENV{PERL_SRCDIR})) {
+    $src_prefix = "$ENV{PERL_SRCDIR}/"
+}
+
+
+my %pm = ("$src_prefix/Git.pm" => '$(INST_LIBDIR)/Git.pm');
+
+
 
 # We come with our own bundled Error.pm. It's not in the set of default
 # Perl modules so install it if it's not available on the system yet.
 eval { require Error };
 if ($@) {
-	$pm{'private-Error.pm'} = '$(INST_LIBDIR)/Error.pm';
+	$pm{"$src_prefix/private-Error.pm"} = '$(INST_LIBDIR)/Error.pm';
 }
 
 my %extra;
 $extra{DESTDIR} = $ENV{DESTDIR} if $ENV{DESTDIR};
 
+
 WriteMakefile(
 	NAME            => 'Git',
-	VERSION_FROM    => 'Git.pm',
+	VERSION_FROM    => "$src_prefix/Git.pm",
 	PM		=> \%pm,
 	MAKEFILE	=> 'perl.mak',
 	%extra