Makefile: Always do dependency tracking

If you now change znc.h, every file that '#include's znc.h is *always*
regenerated.

According to [1], these compiler flags were already around with GCC 3.2, so
this change shouldn't hurt anyone.

[1] http://lists.samba.org/archive/ccache/2002q4/000003.html


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@1026 726aef4b-f618-498e-8847-2d620e286838

Makefile.in

@@ -22,24 +22,17 @@ CLEAN := znc znc-static *.o core core.*
 DISTCLEAN := Makefile config.log config.status znc-config .depend \
 	modules/.depend modules/Makefile
 
-DEPEND   := $(wildcard .depend)
-ifeq ($(DEPEND), )
-DEPEND   := no
-else
-DEPEND   := yes
-endif
-
-.PHONY: all modules clean distclean install
+.PHONY: all modules clean depend distclean install
 
 all: znc @MODTARGET@
 
 .depend:
 	@mkdir -p .depend
-	@if test -n "@MODTARGET@"; then \
-		$(MAKE) -C modules .depend ; \
-	fi
 
 depend: .depend
+	@if test -n "@MODTARGET@"; then \
+		$(MAKE) -C modules depend ; \
+	fi
 
 znc: $(OBJS)
 	$(CXX) $(LDFLAGS) -o $@ $(OBJS) $(LIBS)
@@ -63,13 +56,8 @@ clean:
 distclean: clean
 	rm -rf $(DISTCLEAN)
 
-ifeq ($(DEPEND), yes)
-.cpp.o:
+%.o: %.cpp .depend
 	$(CXX) $(CXXFLAGS) $(INCLUDES) -c -o $@ $< -MMD -MF .depend/$<.dep
-else
-.cpp.o:
-	$(CXX) $(CXXFLAGS) $(INCLUDES) -c -o $@ $<
-endif
 
 install: znc @MODTARGET@
 	mkdir -p $(DESTDIR)$(prefix)/bin

modules/Makefile.in

@@ -47,14 +47,7 @@ TARGETS  := $(addsuffix .so, $(FILES))
 
 CLEAN    := *.so
 
-DEPEND   := $(wildcard .depend)
-ifeq ($(DEPEND), )
-DEPEND   := no
-else
-DEPEND   := yes
-endif
-
-.PHONY: all clean install modperl_install
+.PHONY: all clean depend install modperl_install
 
 all: $(TARGETS)
 
@@ -81,13 +74,8 @@ install_metadirs: create_install_dir
 clean:
 	rm -rf $(CLEAN)
 
-ifeq ($(DEPEND), yes)
-%.so: %.cpp
+%.so: %.cpp .depend
 	$(CXX) $(MODFLAGS) $(INCLUDES) $(LDFLAGS) -shared -o $@ $< $($(basename $<)FLAGS) -MMD -MF .depend/$<.dep
-else
-%.so: %.cpp
-	$(CXX) $(MODFLAGS) $(INCLUDES) $(LDFLAGS) -shared -o $@ $< $($(basename $<)FLAGS)
-endif
 
 modperl_install: create_install_dir
 	for i in *.pm; do \