Makefiles: split external build from Praat-itself

This introduces intermediate targets all-external and clean-external
that deal with the bundled external packages, and also all-self and
clean-self that deal with the Praat sources themselves.

This is inspired by praat#1238, and makes it slightly easier to
build externals while ignoring warnings, and then building
Praat itself while paying attention to warnings.

Makefile

@@ -12,14 +12,31 @@ include makefile.defs
 .PHONY: all clean install
 
 # Makes the Praat executable in the source directory.
-all:
+all: all-external all-self
+	$(LINK) -o $(EXECUTABLE) main/main_Praat.o $(MAIN_ICON) fon/libfon.a \
+		artsynth/libartsynth.a FFNet/libFFNet.a \
+		gram/libgram.a EEG/libEEG.a \
+		LPC/libLPC.a dwtools/libdwtools.a \
+		fon/libfon.a stat/libstat.a dwsys/libdwsys.a \
+		sys/libsys.a melder/libmelder.a kar/libkar.a \
+		external/espeak/libespeak.a \
+		external/portaudio/libportaudio.a \
+		external/flac/libflac.a external/mp3/libmp3.a \
+		external/glpk/libglpk.a \
+		external/clapack/libclapack.a \
+		external/gsl/libgsl.a \
+		$(LIBS)
+
+all-external:
 	$(MAKE) -C external/clapack
 	$(MAKE) -C external/gsl
 	$(MAKE) -C external/glpk
 	$(MAKE) -C external/mp3
 	$(MAKE) -C external/flac
 	$(MAKE) -C external/portaudio
 	$(MAKE) -C external/espeak
+
+all-self:
 	$(MAKE) -C kar
 	$(MAKE) -C melder
 	$(MAKE) -C sys
@@ -33,28 +50,20 @@ all:
 	$(MAKE) -C FFNet
 	$(MAKE) -C artsynth
 	$(MAKE) -C main main_Praat.o $(ICON)
-	$(LINK) -o $(EXECUTABLE) main/main_Praat.o $(MAIN_ICON) fon/libfon.a \
-		artsynth/libartsynth.a FFNet/libFFNet.a \
-		gram/libgram.a EEG/libEEG.a \
-		LPC/libLPC.a dwtools/libdwtools.a \
-		fon/libfon.a stat/libstat.a dwsys/libdwsys.a \
-		sys/libsys.a melder/libmelder.a kar/libkar.a \
-		external/espeak/libespeak.a \
-		external/portaudio/libportaudio.a \
-		external/flac/libflac.a external/mp3/libmp3.a \
-		external/glpk/libglpk.a \
-		external/clapack/libclapack.a \
-		external/gsl/libgsl.a \
-		$(LIBS)
 
-clean:
+clean: clean-external clean-self
+	$(RM) praat
+
+clean-external:
 	$(MAKE) -C external/clapack clean
 	$(MAKE) -C external/gsl clean
 	$(MAKE) -C external/glpk clean
 	$(MAKE) -C external/mp3 clean
 	$(MAKE) -C external/flac clean
 	$(MAKE) -C external/portaudio clean
 	$(MAKE) -C external/espeak clean
+
+clean-self:
 	$(MAKE) -C kar clean
 	$(MAKE) -C melder clean
 	$(MAKE) -C sys clean
@@ -68,7 +77,6 @@ clean:
 	$(MAKE) -C FFNet clean
 	$(MAKE) -C artsynth clean
 	$(MAKE) -C main clean
-	$(RM) praat
 
 install:
 	$(INSTALL)