Parallelize byte compilation on MS-Windows.

 lisp/makefile.w32-in (WINS_BASIC1, WINS_BASIC2, WINS_BASIC3)
 (WINS_BASIC4): New variables, subdivide subdirectories into 4
 parts.
 (WINS_BASIC): Define as concatenation of the above.
 (compile): Subdivide into 4 separate and independent jobs that can
 be run in parallel.
 (compile0-CMD, compile0-SH): New targets for compiling
 COMPILE_FIRST files, which are prerequisites for the rest of the
 byte-compilation.
 (compile1-CMD, compile2-CMD, compile3-CMD, compile4-CMD): New
 targets for parallel compilation with cmd.exe.
 (compile1-SH, compile2-SH, compile3-SH, compile4-SH): Ditto for
 compiling under a Unixy shell.

2 files changed, 90 insertions, 12 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index e7d8f0652c..5dba3964f1 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,20 @@
+2012-12-09  Eli Zaretskii  <[email protected]>
+
+	Parallelize byte compilation on MS-Windows.
+	* makefile.w32-in (WINS_BASIC1, WINS_BASIC2, WINS_BASIC3)
+	(WINS_BASIC4): New variables, subdivide subdirectories into 4
+	parts.
+	(WINS_BASIC): Define as concatenation of the above.
+	(compile): Subdivide into 4 separate and independent jobs that can
+	be run in parallel.
+	(compile0-CMD, compile0-SH): New targets for compiling
+	COMPILE_FIRST files, which are prerequisites for the rest of the
+	byte-compilation.
+	(compile1-CMD, compile2-CMD, compile3-CMD, compile4-CMD): New
+	targets for parallel compilation with cmd.exe.
+	(compile1-SH, compile2-SH, compile3-SH, compile4-SH): Ditto for
+	compiling under a Unixy shell.
+
 2012-12-09  Chong Yidong  <[email protected]>
 
 	* simple.el (set-mark-default-inactive): Delete this
diff --git a/lisp/makefile.w32-in b/lisp/makefile.w32-in
index 9f1b57e85b..cb2cba466f 100644
--- a/lisp/makefile.w32-in
+++ b/lisp/makefile.w32-in
@@ -104,27 +104,39 @@ WINS_CEDET=\
 	cedet/semantic/symref \
 	cedet/semantic/wisent
 
-WINS_BASIC=\
+# The list of subdirectories is subdivided into 4 more or less equal
+# parts so that we could have 4-way parallelism while compiling Lisp
+# files, which helps to slash bootstrap times.  See the 'compile'
+# target below.
+WINS_BASIC1=\
 	calc \
 	calendar \
 	emacs-lisp \
-	emulation \
 	erc \
-	eshell \
+	net \
+	url
+
+WINS_BASIC2=\
 	gnus \
 	international \
 	language \
-	mail \
+	mail
+
+WINS_BASIC3=\
+	emulation \
 	mh-e \
-	net \
 	nxml \
 	org \
 	play \
-	progmodes \
 	textmodes \
-	url \
 	vc
 
+WINS_BASIC4=\
+	eshell \
+	progmodes
+
+WINS_BASIC= $(WINS_BASIC1) $(WINS_BASIC2) $(WINS_BASIC3) $(WINS_BASIC4)
+
 # Directories with lisp files to compile, and to extract data from
 # (customs, autoloads, etc.)
 WINS_UPDATES=$(WINS_BASIC) \
@@ -311,22 +323,71 @@ TAGS-LISP-CMD: $(lisptagsfiles1) $(lisptagsfiles2) $(lisptagsfiles3) $(lisptagsf
 # compiled find the right files.
 
 # Need separate version for sh and native cmd.exe
-compile: $(lisp)/subdirs.el compile-$(SHELLTYPE) doit
+compile: $(lisp)/subdirs.el compile0-$(SHELLTYPE) compile1-$(SHELLTYPE) compile2-$(SHELLTYPE) compile3-$(SHELLTYPE) compile4-$(SHELLTYPE) doit
 
-compile-CMD: autoloads
+compile0-CMD: autoloads
 #	-for %%f in ($(lisp) $(WINS)) do for %%g in (%%f\*.elc) do @attrib -r %%g
 	for %%f in ($(COMPILE_FIRST)) do \
 	  $(emacs) -l loaddefs $(BYTE_COMPILE_FLAGS) -f batch-byte-compile-if-not-done %%f
-	for %%f in (. $(WINS)) do for %%g in (%%f/*.el) do \
+
+compile1-CMD: autoloads compile0-CMD
+	for %%f in (. $(WINS_BASIC1)) do for %%g in (%%f/*.el) do \
 	  $(emacs) -l loaddefs $(BYTE_COMPILE_FLAGS) -f batch-byte-compile-if-not-done %%f/%%g
 
-compile-SH: autoloads
+compile2-CMD: autoloads compile0-CMD
+	for %%f in ($(WINS_BASIC2)) do for %%g in (%%f/*.el) do \
+	  $(emacs) -l loaddefs $(BYTE_COMPILE_FLAGS) -f batch-byte-compile-if-not-done %%f/%%g
+
+compile3-CMD: autoloads compile0-CMD
+	for %%f in ($(WINS_BASIC3)) do for %%g in (%%f/*.el) do \
+	  $(emacs) -l loaddefs $(BYTE_COMPILE_FLAGS) -f batch-byte-compile-if-not-done %%f/%%g
+
+compile4-CMD: autoloads compile0-CMD
+	for %%f in ($(WINS_BASIC4) $(WINS_CEDET) term obsolete) do for %%g in (%%f/*.el) do \
+	  $(emacs) -l loaddefs $(BYTE_COMPILE_FLAGS) -f batch-byte-compile-if-not-done %%f/%%g
+
+compile0-SH: autoloads
 #	for elc in $(lisp)/*.elc $(lisp)/*/*.elc; do attrib -r $$elc; done
 	for el in $(COMPILE_FIRST); do \
 	  echo Compiling $$el; \
 	  $(emacs) -l loaddefs $(BYTE_COMPILE_FLAGS) -f batch-byte-compile-if-not-done $$el; \
 	done
-	for dir in $(lisp) $(WINS); do \
+
+compile1-SH: autoloads compile0-SH
+	for dir in $(lisp) $(WINS_BASIC1); do \
+	  for el in $$dir/*.el; do \
+	    if test -f $$el; \
+	    then \
+	      echo Compiling $$el; \
+	      $(emacs) -l loaddefs $(BYTE_COMPILE_FLAGS) -f batch-byte-compile-if-not-done $$el; \
+	    fi \
+	  done; \
+	done
+
+compile2-SH: autoloads compile0-SH
+	for dir in $(WINS_BASIC2); do \
+	  for el in $$dir/*.el; do \
+	    if test -f $$el; \
+	    then \
+	      echo Compiling $$el; \
+	      $(emacs) -l loaddefs $(BYTE_COMPILE_FLAGS) -f batch-byte-compile-if-not-done $$el; \
+	    fi \
+	  done; \
+	done
+
+compile3-SH: autoloads compile0-SH
+	for dir in $(WINS_BASIC3); do \
+	  for el in $$dir/*.el; do \
+	    if test -f $$el; \
+	    then \
+	      echo Compiling $$el; \
+	      $(emacs) -l loaddefs $(BYTE_COMPILE_FLAGS) -f batch-byte-compile-if-not-done $$el; \
+	    fi \
+	  done; \
+	done
+
+compile4-SH: autoloads compile0-SH
+	for dir in $(WINS_BASIC4) $(WINS_CEDET) terms obsolete; do \
 	  for el in $$dir/*.el; do \
 	    if test -f $$el; \
 	    then \