make: use variable for pkg subdir

Makefile.buildtests

@@ -55,6 +55,7 @@ buildtest:
 	        RIOTBASE=$${RIOTBASE} \
 	        RIOTBOARD=$${RIOTBOARD} \
 	        RIOTCPU=$${RIOTCPU} \
+	        RIOTPKG=$${RIOTPKG} \
 	        BINDIRBASE=$${BINDIRBASE} \
 	        RIOTNOLINK=$${RIOTNOLINK} \
 	        RIOT_VERSION=$${RIOT_VERSION} \
@@ -90,6 +91,7 @@ buildtest:
 	    RIOTBASE=$${RIOTBASE} \
 	    RIOTBOARD=$${RIOTBOARD} \
 	    RIOTCPU=$${RIOTCPU} \
+	    RIOTPKG=$${RIOTPKG} \
 	    BINDIRBASE=$${BINDIRBASE} \
 	    RIOTNOLINK=$${RIOTNOLINK} \
 	    RIOT_VERSION=$${RIOT_VERSION} \
@@ -127,6 +129,7 @@ info-buildsizes:
 	    RIOTBASE=$${RIOTBASE} \
 	    RIOTBOARD=$${RIOTBOARD} \
 	    RIOTCPU=$${RIOTCPU} \
+	    RIOTPKG=$${RIOTPKG} \
 	    BINDIRBASE=$${BINDIRBASE} \
 	    $(MAKE) info-buildsize 2>/dev/null | tail -n-1 | cut -f-4)" "$${BOARD}"; \
 	done;
@@ -143,6 +146,7 @@ info-buildsizes-diff:
 	      RIOTBASE=$${RIOTBASE} \
 	      RIOTBOARD=$${RIOTBOARD} \
 	      RIOTCPU=$${RIOTCPU} \
+	      RIOTPKG=$${RIOTPKG} \
 	      BINDIRBASE=$${BINDIRBASE} \
 	      $(MAKE) info-buildsize 2>/dev/null | tail -n-1 | cut -f-4; \
 	  done | \
@@ -176,6 +180,7 @@ info-build:
 	@echo 'RIOTBASE:  $(RIOTBASE)'
 	@echo 'RIOTBOARD: $(RIOTBOARD)'
 	@echo 'RIOTCPU:   $(RIOTCPU)'
+	@echo 'RIOTPKG:   $(RIOTPKG)'
 	@echo ''
 	@echo 'DEFAULT_MODULE: $(sort $(filter-out $(DISABLE_MODULE), $(DEFAULT_MODULE)))'
 	@echo 'DISABLE_MODULE: $(sort $(DISABLE_MODULE))'
@@ -296,5 +301,5 @@ info-files:
 	    echo "$$CPPSRC" | xargs dirname -- | sort | uniq | xargs -I{} find {} -name "Makefile*"; \
 	    echo "$$CPPSRC" | xargs $(CXX) $(CXXFLAGS) $(INCLUDES) -MM 2> /dev/null | grep -o "[^ ]\+\.h"; \
 	  fi; \
-	  $(foreach pkg,$(USEPKG),find $(RIOTBASE)/pkg/$(pkg) -type f;) \
+	  $(foreach pkg,$(USEPKG),find $(RIOTPKG)/$(pkg) -type f;) \
 	) | sort | uniq | sed 's#$(RIOTBASE)/##'

Makefile.include

@@ -15,6 +15,8 @@ RIOTCPU := $(abspath $(RIOTCPU))
 RIOTBOARD ?= $(RIOTBASE)/boards
 RIOTBOARD := $(abspath $(RIOTBOARD))
 
+RIOTPKG ?= $(RIOTBASE)/pkg
+
 RIOTPROJECT ?= $(shell git rev-parse --show-toplevel 2>/dev/null || pwd)
 RIOTPROJECT := $(abspath $(RIOTPROJECT))
 
@@ -247,33 +249,33 @@ INCLUDES += $(USEMODULE_INCLUDES_:%=-I%)
 
 # The `clean` needs to be serialized before everything else.
 ifneq (, $(filter clean, $(MAKECMDGOALS)))
-    all $(BASELIBS) $(USEPKG:%=$(RIOTBASE)/pkg/%/Makefile.include): clean
+    all $(BASELIBS) $(USEPKG:%=$(RIOTPKG)/%/Makefile.include): clean
 endif
 
 # include Makefile.includes for packages in $(USEPKG)
-$(RIOTBASE)/pkg/%/Makefile.include::
-	$(AD)"$(MAKE)" -C $(RIOTBASE)/pkg/$* Makefile.include
+$(RIOTPKG)/%/Makefile.include::
+	$(AD)"$(MAKE)" -C $(RIOTPKG)/$* Makefile.include
 
-.PHONY: $(USEPKG:%=$(RIOTBASE)/pkg/%/Makefile.include)
--include $(USEPKG:%=$(RIOTBASE)/pkg/%/Makefile.include)
+.PHONY: $(USEPKG:%=$(RIOTPKG)/%/Makefile.include)
+-include $(USEPKG:%=$(RIOTPKG)/%/Makefile.include)
 
 .PHONY: $(USEPKG:%=${BINDIR}%.a)
 $(USEPKG:%=${BINDIR}%.a):
 	@mkdir -p ${BINDIR}
-	"$(MAKE)" -C $(RIOTBASE)/pkg/$(patsubst ${BINDIR}%.a,%,$@)
+	"$(MAKE)" -C $(RIOTPKG)/$(patsubst ${BINDIR}%.a,%,$@)
 
 clean:
-	-@for i in $(USEPKG) ; do "$(MAKE)" -C $(RIOTBASE)/pkg/$$i clean ; done
+	-@for i in $(USEPKG) ; do "$(MAKE)" -C $(RIOTPKG)/$$i clean ; done
 	-@rm -rf $(BINDIR)
 	-@rm -rf $(SCANBUILD_OUTPUTDIR)
 
 # Remove intermediates, but keep the .elf, .hex and .map etc.
 clean-intermediates:
-	-@for i in $(USEPKG) ; do "$(MAKE)" -C $(RIOTBASE)/pkg/$$i clean ; done
+	-@for i in $(USEPKG) ; do "$(MAKE)" -C $(RIOTPKG)/$$i clean ; done
 	-@rm -rf $(BINDIR)/*.a $(BINDIR)/*/
 
 distclean:
-	-@for i in $(USEPKG) ; do "$(MAKE)" -C $(RIOTBASE)/pkg/$$i distclean ; done
+	-@for i in $(USEPKG) ; do "$(MAKE)" -C $(RIOTPKG)/$$i distclean ; done
 	-@rm -rf $(BINDIRBASE)
 
 flash: all

Makefile.vars

@@ -16,6 +16,7 @@ export APPDEPS               # Files / Makefile targets that need to be created
 export RIOTBASE              # The root folder of RIOT. The folder where this very file lives in.
 export RIOTCPU               # For third party CPUs this folder is the base of the CPUs.
 export RIOTBOARD             # For third party BOARDs this folder is the base of the BOARDs.
+export RIOTPKG               # For overriding RIOT's pkg directory
 export RIOTPROJECT           # Top level git root of the project being built, or PWD if not a git repository
 export BINDIRBASE            # This is the folder where the application should be built in. For each BOARD a different subfolder is used.
 export BINDIR                # This is the folder where the application should be built in.