build: Fix 'make -j' handling.

Some build targets create multiple outputs, which can cause problems
when doing parallel builds. Clean up the build system so that all
subdir invocations come from the top-level Makefile and use $(MAKE).
Also fix the FREEDOOM/FREEDM lumps to really include the version
number by using $(shell ...) syntax.

Makefile

@@ -27,7 +27,7 @@
 # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-VERSION!=git describe
+VERSION=$(shell git describe)
 WADS=wads
 CPP=scripts/simplecpp
 DEUTEX=deutex
@@ -43,14 +43,21 @@ OBJS=$(FREEDM) $(FREEDOOM1) $(FREEDOOM2)
 all: $(OBJS)
 
 subdirs:
-	make -C graphics/text
-	make -C graphics/titlepic
-	make -C lumps
+	$(MAKE) -C graphics/text
+	$(MAKE) -C graphics/titlepic
+	$(MAKE) -C lumps/cph/misc-lumps
+	$(MAKE) -C lumps/genmidi
+	$(MAKE) -C lumps/dmxgus
+	$(MAKE) -C lumps/textures
+
 
 # this is a useless dependency to force builds
 
 force:
 
+lumps/freedoom.lmp lumps/freedm.lmp: force
+	echo $(VERSION) > $@
+
 pnames.txt:
 	scripts/extract-pnames.py -a > $@
 
@@ -78,7 +85,7 @@ wadinfo_freedm.txt : buildcfg.txt force pnames.txt
 #---------------------------------------------------------
 # freedm iwad
 
-$(FREEDM): wadinfo_freedm.txt subdirs force
+$(FREEDM): wadinfo_freedm.txt subdirs lumps/freedm.lmp
 	@mkdir -p $(WADS)
 	rm -f $@
 	$(DEUTEX) $(DEUTEX_ARGS) -iwad -build wadinfo_freedm.txt $@
@@ -86,7 +93,7 @@ $(FREEDM): wadinfo_freedm.txt subdirs force
 #---------------------------------------------------------
 # phase 1 (udoom) iwad
 
-$(FREEDOOM1): wadinfo_phase1.txt subdirs force
+$(FREEDOOM1): wadinfo_phase1.txt subdirs lumps/freedoom.lmp
 	@mkdir -p $(WADS)
 	rm -f $@
 	$(DEUTEX) $(DEUTEX_ARGS) -iwad -lumps -patch -flats -sounds -musics -graphics -sprites -levels -build wadinfo_phase1.txt $@
@@ -94,7 +101,7 @@ $(FREEDOOM1): wadinfo_phase1.txt subdirs force
 #---------------------------------------------------------
 # phase 2 (doom2) iwad
 
-$(FREEDOOM2): wadinfo_phase2.txt subdirs force
+$(FREEDOOM2): wadinfo_phase2.txt subdirs lumps/freedoom.lmp
 	@mkdir -p $(WADS)
 	rm -f $@
 	$(DEUTEX) $(DEUTEX_ARGS) -iwad -lumps -patch -flats -sounds -musics -graphics -sprites -levels -build wadinfo_phase2.txt $@
@@ -119,6 +126,11 @@ clean:
 		pnames.txt
 	-rmdir $(WADS)
 
-	make -C lumps clean
-	make -C graphics/text clean
-	make -C graphics/titlepic clean
+	$(MAKE) -C lumps clean
+	$(MAKE) -C graphics/text clean
+	$(MAKE) -C graphics/titlepic clean
+	$(MAKE) -C lumps/cph/misc-lumps clean
+	$(MAKE) -C lumps/genmidi clean
+	$(MAKE) -C lumps/dmxgus clean
+	$(MAKE) -C lumps/textures clean
+

graphics/text/Makefile

@@ -39,9 +39,22 @@ GRAPHICS = \
 
 all: $(GRAPHICS)
 
-$(GRAPHICS): config.py fontchars ../../lumps/fraggle/freedoom.bex
+# textgen creates multiple outputs, which is awkward to express in
+# make. Use a witness file (graphics.stamp) as suggested in the
+# automake manual: "Handling Tools that Produce Many Outputs"
+
+$(GRAPHICS): graphics.stamp
+	@if test -f $@; then :; else \
+	  rm -f graphics.stamp; \
+	  $(MAKE) data.stamp; \
+	fi
+
+graphics.stamp: config.py fontchars ../../lumps/fraggle/freedoom.bex
+	@rm -f graphics.tmp
+	@touch graphics.tmp
 	./textgen
+	@mv graphics.tmp $@
 
 clean:
-	rm -f $(GRAPHICS)
+	rm -f $(GRAPHICS) graphics.stamp
 

lumps/Makefile

@@ -1,30 +0,0 @@
-
-all : freedoom.lmp freedm.lmp misc-lumps genmidi-lump dmxgus.lmp \
-      fd1txtr1.lmp fd2txtr1.lmp fdmtxtr1.lmp
-
-misc-lumps:
-	make -C cph/misc-lumps
-
-genmidi-lump:
-	make -C genmidi
-
-dmxgus.lmp:
-	make -C dmxgus
-
-fd1txtr1.lmp fd2txtr1.lmp fdmtxtr1.lmp:
-	make -C textures
-
-freedoom.lmp: force
-	echo $(VERSION) > freedoom.lmp
-
-freedm.lmp: force
-	echo $(VERSION) > freedm.lmp
-
-force:
-
-clean:
-	make -C cph/misc-lumps clean
-	make -C genmidi clean
-	make -C dmxgus clean
-	make -C textures clean
-

lumps/textures/Makefile

@@ -1,13 +1,9 @@
 
 CPP=../../scripts/simplecpp
-PHASE1_OUTPUTS = phase1/texture1.lmp phase1/texture2.lmp \
-                 phase1/pnames.lmp
-PHASE2_OUTPUTS = phase2/texture1.lmp phase2/pnames.lmp
-FREEDM_OUTPUTS = freedm/texture1.lmp freedm/pnames.lmp
 
-all: $(PHASE1_OUTPUTS) $(PHASE2_OUTPUTS) $(FREEDM_OUTPUTS)
+all: phase1/texture1.lmp phase2/texture1.lmp freedm/texture1.lmp
 
-$(PHASE1_OUTPUTS): textures.cfg
+phase1/texture1.lmp:
 	$(CPP) -DDOOM1 -DULTDOOM < textures.cfg |                \
 	./build-textures -compat_texture1=doom1/texture1.txt     \
 	                 -compat_texture2=doom1/texture2.txt     \
@@ -16,14 +12,14 @@ $(PHASE1_OUTPUTS): textures.cfg
 			 -output_texture2=phase1/texture2.lmp    \
 			 -output_pnames=phase1/pnames.lmp
 
-$(PHASE2_OUTPUTS): textures.cfg
+phase2/texture1.lmp:
 	$(CPP) -DDOOM1 -DDOOM2 < textures.cfg |                  \
 	./build-textures -compat_texture1=doom2/texture1.txt     \
 			 -compat_pnames=doom2/pnames.txt         \
 			 -output_texture1=phase2/texture1.lmp    \
 			 -output_pnames=phase2/pnames.lmp
 
-$(FREEDM_OUTPUTS): textures.cfg
+freedm/texture1.lmp:
 	$(CPP) -DDOOM1 -DDOOM2 -DFREEDM < textures.cfg |         \
 	./build-textures -compat_texture1=doom2/texture1.txt     \
 			 -compat_pnames=doom2/pnames.txt         \
@@ -32,5 +28,7 @@ $(FREEDM_OUTPUTS): textures.cfg
 
 
 clean:
-	rm -f $(PHASE1_OUTPUTS) $(PHASE2_OUTPUTS) $(FREEDM_OUTPUTS)
+	rm -f phase1/texture1.lmp phase1/texture2.lmp phase1/pnames.lmp \
+	      phase2/texture1.lmp phase2/pnames.lmp                     \
+	      freedm/texture1.lmp freedm/pnames.lmp