Makefile.linkbela

# call this file from within the main Makefile, with all the variables exported, and 
# after re-making $(PROJECT_LIBRARIES_MAKEFILE)

#disable default rules, which would make it try to rebuild libraries/*/build/*.d when no such files exists
.SUFFIXES:
%.d: ;
%.o: ;

-include libraries/*/build/*.d # dependencies for each of the libraries' object files
-include $(PROJECT_LIBRARIES_MAKEFILE)
#this file will contain, e.g.:
#-include libraries/library1/build/Makefile.link
#-include libraries/library2/build/Makefile.link
#-include libraries/library3/build/Makefile.link
#-include libraries/library4/build/Makefile.link
# each of which will in turn contain:
#
#LIBRARY=libraryName
#LIBRARIES_LDFLAGS += -l123
#THIS_CPPFILES := $(wildcard libraries/$(LIBRARY)/*.cpp)
#LIBRARIES_OBJS += $(addprefix $(LIBRARY)/build/,$(notdir $(THIS_CPPFILES:.cpp=.o)))
#and the following rule tells the current Makefile how to build the LIBRARIES_OBJS:
#either via a default Makefile.libraries, or using the library's custom one (if available)
.EXPORT_ALL_VARIABLES:
libraries/%.o:
	$(AT) { echo "$@" | grep -q "\*" && exit 0; } ; \
	LIBRARYNAME=`echo $@ | sed "s:libraries/\(.*\)/build/.*\.o:\1:"`; \
	{ [ -z "$$LIBRARYNAME" ] && exit 0; } ;  \
	{ echo "$$LIBRARYNAME" | grep -q "\*" && exit 0; } ; \
	echo Building library $$LIBRARYNAME; \
	MAKEFILE=libraries/$$LIBRARYNAME/Makefile; \
	[ ! -f $$MAKEFILE ] && MAKEFILE=Makefile.libraries; \
	$(MAKE) LIBRARY=$$LIBRARYNAME -f $$MAKEFILE CC=$(CC) CXX=$(CXX) $@

LIBRARIES_OBJS := $(sort $(LIBRARIES_OBJS)) # remove duplicates (e.g.: from default_libpd_render)
# This is a nasty kludge: we want to be able to optionally link in a default
# main file if the user hasn't supplied one. We check for the presence of the main()
# function, and conditionally call one of two recursive make targets depending on whether
# we want to link in the default main file or not. The kludge is the mess of a shell script
# line below. Surely there's a better way to do this?
$(OUTPUT_FILE): $(LIBRARIES_OBJS) $(ALL_OBJS)
	$(eval DEFAULT_MAIN_CONDITIONAL :=\
	    $(shell bash -c '[ `nm -C /dev/null $(PROJECT_OBJS) 2>/dev/null | grep -w T | grep -w main | wc -l` == '0' ] && echo "$(DEFAULT_MAIN_OBJS)" || : '))
ifeq ($(PROJECT_TYPE),libpd)
#If it is a libpd project AND there is no "render" symbol then link in the $(DEFAULT_PD_OBJS) 
	$(eval DEFAULT_PD_CONDITIONAL :=\
	    $(shell bash -c '{ [ `nm -C /dev/null $(PROJECT_OBJS) 2>/dev/null | grep -w T | grep "\<render\>" | wc -l` -eq 0 ]; } && echo '$(DEFAULT_PD_OBJS)' || : ' ))
endif # ifeq ($(PROJECT_TYPE),libpd)
	$(AT) echo 'Linking...'
# we filter-out DEFAULT_ALL_OBJS because they are conditionally added one by one and %.h because they could be added by P_OBJS
	$(AT) $(CXX) $(SYNTAX_FLAG) $(BELA_LDFLAGS) $(LIBRARIES_LDFLAGS) $(LDFLAGS) -pthread -o "$@" $(DEFAULT_MAIN_CONDITIONAL) $(DEFAULT_PD_CONDITIONAL) $(filter-out $(DEFAULT_ALL_OBJS) %.h,$^) $(LDLIBS) $(LIBRARIES_LDLIBS) $(BELA_LDLIBS)
	$(AT) echo ' ...done'