Remove the need for temacs.in

Instead of building a file temacs.in used only to compute a
fingerprint, compute the fingerprint directly from the .o and
.a files that go into temacs.in.  This speeds up the build by
avoiding the need to link temacs twice, once with a dummy
fingerprint.
* lib-src/make-fingerprint.c (main): No need to generate
a fingerprint file that includes config.h, now that fingerprint.c
depends on all the .o files.
* src/Makefile.in ($(libsrc)/make-fingerprint$(EXEEXT)):
Use the same rule as $(libsrc)/make-docfile$(EXEEXT).
* src/fingerprint-dummy.c: Remove.
* src/Makefile.in (${charsets}, $(libsrc)/make-docfile$(EXEEXT))
($(LIBEGNU_ARCHIVE), $(lwlibdir)/liblw.a, $(oldXMenudir)/libXMenu11.a)
(../config.status, ${ETAGS}, ../lisp/TAGS, $(lwlibdir)/TAGS)
($(lispsource)/loaddefs.el):
Prefer ‘$(MAKE) -C $(dir $@)’ to ‘${MAKE} -C SOMESTRING’ when
either will do, as the former is more regular and lets us
coalesce rules better.
(EMACS_DEPS_PRE, EMACS_DEPS_POST, BUILD_EMACS_PRE)
(BUILD_EMACS_POST, temacs.in$(EXEEXT)): Remove.
(FINGERPRINTED): New macro.
(fingerprint.c): Use it instead of temacs.in$(EXEEXT), to
avoid the need to build temacs.in at all.
(temacs$(EXEEXT)): No need to depend on other .o files now;
fingerprint.o is enough, since it depends on the rest.
Spell out what used to be in BUILD_EMACS_PRE and BUILD_EMACS_POST.
(mostlyclean): No need to remove temacs.in.

4 files changed, 23 insertions, 62 deletions

diff --git a/.gitignore b/.gitignore
index bd5a8e79471..98b8222180b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -185,7 +185,6 @@ src/bootstrap-emacs
 src/emacs
 src/emacs-[0-9]*
 src/temacs
-src/temacs.in
 src/fingerprint.c
 src/*.pdmp
 
diff --git a/lib-src/make-fingerprint.c b/lib-src/make-fingerprint.c
index 4bfeaa0742c..35bb8b98a00 100644
--- a/lib-src/make-fingerprint.c
+++ b/lib-src/make-fingerprint.c
@@ -99,9 +99,9 @@ main (int argc, char **argv)
     }
   else
     {
-      puts ("#include <config.h>\n"
-	    "#include \"fingerprint.h\"\n"
-	    "unsigned char const fingerprint[] = {");
+      puts ("#include \"fingerprint.h\"\n"
+	    "unsigned char const fingerprint[] =\n"
+	    "{");
       for (int i = 0; i < 32; ++i)
         printf ("\t0x%02X,\n", digest[i]);
       puts ("};");
diff --git a/src/Makefile.in b/src/Makefile.in
index 0613a0dbed4..f8a2ffadc27 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -533,7 +533,7 @@ ${lispintdir}/cp51932.el ${lispintdir}/eucjp-ms.el: FORCE
 
 charsets = ${top_srcdir}/admin/charsets/charsets.stamp
 ${charsets}: FORCE
-	${MAKE} -C ../admin/charsets all
+	$(MAKE) -C $(dir $@) all
 
 charscript = ${lispintdir}/charscript.el
 ${charscript}: FORCE
@@ -584,8 +584,9 @@ $(etc)/DOC: lisp.mk $(libsrc)/make-docfile$(EXEEXT) $(obj) $(lisp)
 	$(AM_V_at)$(libsrc)/make-docfile -a $(etc)/DOC -d $(lispsource) \
 	  $(shortlisp)
 
-$(libsrc)/make-docfile$(EXEEXT): $(lib)/libgnu.a
-	$(MAKE) -C $(libsrc) make-docfile$(EXEEXT)
+$(libsrc)/make-docfile$(EXEEXT) $(libsrc)/make-fingerprint$(EXEEXT): \
+  $(lib)/libgnu.a
+	$(MAKE) -C $(dir $@) $(notdir $@)
 
 buildobj.h: Makefile
 	$(AM_V_GEN)for i in $(ALLOBJS); do \
@@ -613,32 +614,21 @@ $(ALLOBJS): globals.h
 LIBEGNU_ARCHIVE = $(lib)/lib$(if $(HYBRID_MALLOC),e)gnu.a
 
 $(LIBEGNU_ARCHIVE): $(config_h)
-	$(MAKE) -C $(lib) all
+	$(MAKE) -C $(dir $@) all
 
-EMACS_DEPS_PRE=$(LIBXMENU) $(ALLOBJS)
-EMACS_DEPS_POST=$(LIBEGNU_ARCHIVE) $(EMACSRES) ${charsets} ${charscript}
-BUILD_EMACS_PRE=$(AM_V_CCLD)$(CC) $(ALL_CFLAGS) $(TEMACS_LDFLAGS) $(LDFLAGS) \
-	  -o $@ $(ALLOBJS)
-BUILD_EMACS_POST=$(LIBEGNU_ARCHIVE) $(W32_RES_LINK) $(LIBES)
-
-## We hash this file to generate the build fingerprint
-temacs.in$(EXEEXT): $(EMACS_DEPS_PRE) fingerprint-dummy.o $(EMACS_DEPS_POST)
-	$(BUILD_EMACS_PRE) fingerprint-dummy.o $(BUILD_EMACS_POST)
-
-$(libsrc)/make-fingerprint$(EXEEXT): $(libsrc)/make-fingerprint.c $(lib)/libgnu.a
-	$(MAKE) -C $(libsrc) make-fingerprint$(EXEEXT)
-
-fingerprint.c: temacs.in$(EXEEXT) $(libsrc)/make-fingerprint$(EXEEXT)
-	$(AM_V_GEN)$(libsrc)/make-fingerprint$(EXEEXT) temacs.in$(EXEEXT) \
-	  >$@.tmp
+FINGERPRINTED = $(LIBXMENU) $(ALLOBJS) $(LIBEGNU_ARCHIVE) $(EMACSRES)
+fingerprint.c: $(FINGERPRINTED) $(libsrc)/make-fingerprint$(EXEEXT)
+	$(AM_V_GEN)$(libsrc)/make-fingerprint$(EXEEXT) $(FINGERPRINTED) >$@.tmp
 	$(AM_V_at)mv $@.tmp $@
 
 ## We have to create $(etc) here because init_cmdargs tests its
 ## existence when setting Vinstallation_directory (FIXME?).
 ## This goes on to affect various things, and the emacs binary fails
 ## to start if Vinstallation_directory has the wrong value.
-temacs$(EXEEXT): $(EMACS_DEPS_PRE) fingerprint.o $(EMACS_DEPS_POST)
-	$(BUILD_EMACS_PRE) fingerprint.o $(BUILD_EMACS_POST)
+temacs$(EXEEXT): fingerprint.o $(charsets) $(charscript)
+	$(AM_V_CCLD)$(CC) -o $@ $(ALL_CFLAGS) $(TEMACS_LDFLAGS) $(LDFLAGS) \
+	  $(ALLOBJS) fingerprint.o \
+	  $(LIBEGNU_ARCHIVE) $(W32_RES_LINK) $(LIBES)
 	$(MKDIR_P) $(etc)
 ifeq ($(DUMPING),unexec)
   ifneq ($(PAXCTL_notdumped),)
@@ -649,15 +639,15 @@ endif
 ## The following oldxmenu-related rules are only (possibly) used if
 ## HAVE_X11 && !USE_GTK, but there is no harm in always defining them.
 $(lwlibdir)/liblw.a: $(config_h) globals.h lisp.h FORCE
-	$(MAKE) -C $(lwlibdir) liblw.a
+	$(MAKE) -C $(dir $@) $(notdir $@)
 $(oldXMenudir)/libXMenu11.a: FORCE
-	$(MAKE) -C $(oldXMenudir) libXMenu11.a
+	$(MAKE) -C $(dir $@) $(notdir $@)
 FORCE:
 .PHONY: FORCE
 
 .PRECIOUS: ../config.status Makefile
 ../config.status: $(top_srcdir)/configure.ac $(top_srcdir)/m4/*.m4
-	$(MAKE) -C .. $(notdir $@)
+	$(MAKE) -C $(dir $@) $(notdir $@)
 Makefile: ../config.status $(srcdir)/Makefile.in
 	$(MAKE) -C .. src/$@
 
@@ -675,7 +665,7 @@ ns-app: emacs$(EXEEXT) $(pdmp)
 
 mostlyclean:
 	rm -f temacs$(EXEEXT) core ./*.core \#* ./*.o
-	rm -f temacs.in$(EXEEXT) fingerprint.c
+	rm -f fingerprint.c
 	rm -f emacs.pdmp
 	rm -f ../etc/DOC
 	rm -f bootstrap-emacs$(EXEEXT) $(bootstrap_pdmp)
@@ -713,7 +703,7 @@ extraclean: distclean
 ETAGS = ../lib-src/etags${EXEEXT}
 
 ${ETAGS}: FORCE
-	${MAKE} -C ../lib-src $(notdir $@)
+	$(MAKE) -C $(dir $@) $(notdir $@)
 
 # Remove macuvs.h and fingerprint.c since they'd cause `src/emacs`
 # to be built before we can get TAGS.
@@ -738,11 +728,8 @@ TAGS: ${ETAGS} $(ctagsfiles1) $(ctagsfiles2)
 
 ## Arrange to make tags tables for ../lisp and ../lwlib,
 ## which the above TAGS file for the C files includes by reference.
-../lisp/TAGS: FORCE
-	$(MAKE) -C ../lisp TAGS ETAGS="$(ETAGS)"
-
-$(lwlibdir)/TAGS: FORCE
-	$(MAKE) -C $(lwlibdir) TAGS ETAGS="$(ETAGS)"
+../lisp/TAGS $(lwlibdir)/TAGS: FORCE
+	$(MAKE) -C $(dir $@) $(notdir $@) ETAGS="$(ETAGS)"
 
 tags: TAGS ../lisp/TAGS $(lwlibdir)/TAGS
 .PHONY: tags
@@ -778,7 +765,7 @@ VCSWITNESS =
 
 $(lispsource)/loaddefs.el: $(VCSWITNESS) | \
 		bootstrap-emacs$(EXEEXT) $(bootstrap_pdmp)
-	$(MAKE) -C ../lisp autoloads EMACS="$(bootstrap_exe)"
+	$(MAKE) -C $(dir $@) autoloads EMACS="$(bootstrap_exe)"
 
 ## Dump an Emacs executable named bootstrap-emacs containing the
 ## files from loadup.el in source form.
diff --git a/src/fingerprint-dummy.c b/src/fingerprint-dummy.c
deleted file mode 100644
index 04938bd1d08..00000000000
--- a/src/fingerprint-dummy.c
+++ /dev/null
@@ -1,25 +0,0 @@
-/* Dummy fingerprint
-
-Copyright (C) 2016, 2018-2019 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/>.  */
-
-#include <config.h>
-
-#include "fingerprint.h"
-
-/* Dummy fingerprint to use as hash input.  */
-unsigned char const fingerprint[32] = { 0 };