makefiles: use 'BOARDSDIR' for the boards directory in compilation

Replace uses of 'RIOTBOARD' by 'BOARDSDIR' during the compilation.

Makefile.dep

@@ -6,7 +6,7 @@ OLD_USEPKG := $(sort $(USEPKG))
 -include $(APPDIR)/Makefile.board.dep
 
 # include board dependencies
--include $(RIOTBOARD)/$(BOARD)/Makefile.dep
+-include $(BOARDSDIR)/$(BOARD)/Makefile.dep
 
 # include cpu dependencies
 -include $(RIOTCPU)/$(CPU)/Makefile.dep

Makefile.features

@@ -5,7 +5,11 @@
 # This makes them available when setting features based on CPU_MODEL in the cpu
 # Makefile.features and also during dependency resolution.
 
-include $(RIOTBOARD)/$(BOARD)/Makefile.features
+# Transition:
+#   Moving 'CPU/CPU_MODEL' to Makefile.features is an ongoing work and may not
+#   reflect the state of all boards for the moment.
+
+include $(BOARDSDIR)/$(BOARD)/Makefile.features
 
 # Sanity check
 ifeq (,$(CPU))

Makefile.include

@@ -259,7 +259,7 @@ LAZYSPONGE_FLAGS ?= $(if $(filter 1,$(QUIET)),,--verbose)
 ifeq (, $(APPLICATION))
     $(error An application name must be specified as APPLICATION.)
 endif
-ifneq (0,$(shell test -d $(RIOTBOARD)/$(BOARD); echo $$?))
+ifneq (0,$(shell test -d $(BOARDSDIR)/$(BOARD); echo $$?))
     $(error The specified board $(BOARD) does not exist.)
 endif
 
@@ -317,8 +317,8 @@ include $(RIOTMAKE)/pseudomodules.inc.mk
 include $(RIOTMAKE)/defaultmodules.inc.mk
 
 # Include Board and CPU configuration
-INCLUDES += $(addprefix -I,$(wildcard $(RIOTBOARD)/$(BOARD)/include))
-include $(RIOTBOARD)/$(BOARD)/Makefile.include
+INCLUDES += $(addprefix -I,$(wildcard $(BOARDSDIR)/$(BOARD)/include))
+include $(BOARDSDIR)/$(BOARD)/Makefile.include
 INCLUDES += -I$(RIOTCPU)/$(CPU)/include
 include $(RIOTCPU)/$(CPU)/Makefile.include
 

makefiles/application.inc.mk

@@ -1,6 +1,6 @@
 MODULE = $(APPLICATION_MODULE)
 
-DIRS += $(RIOTCPU)/$(CPU) $(RIOTBOARD)/$(BOARD)
+DIRS += $(RIOTCPU)/$(CPU) $(BOARDSDIR)/$(BOARD)
 DIRS += $(RIOTBASE)/core $(RIOTBASE)/drivers $(RIOTBASE)/sys
 
 # For regular modules, adding files to BLOBS to their Makefile is sufficient to

makefiles/boards.inc.mk

@@ -1,10 +1,10 @@
 # Default when RIOTBASE is not set and is executed from the RIOT directory
-RIOTBOARD ?= $(or $(RIOTBASE),$(CURDIR))/boards
+BOARDSDIR ?= $(or $(RIOTBASE),$(CURDIR))/boards
 
 # List all boards.
-# By default, all directories in RIOTBOARD except 'common'
+# By default, all directories in BOARDSDIR except 'common'
 #   use 'wildcard */.' to only list directories
-ALLBOARDS ?= $(sort $(filter-out common,$(patsubst $(RIOTBOARD)/%/.,%,$(wildcard $(RIOTBOARD)/*/.))))
+ALLBOARDS ?= $(sort $(filter-out common,$(patsubst $(BOARDSDIR)/%/.,%,$(wildcard $(BOARDSDIR)/*/.))))
 
 # Set the default value from `BOARDS`
 BOARDS ?= $(ALLBOARDS)

makefiles/info.inc.mk

@@ -36,6 +36,7 @@ info-build:
 	@echo ''
 	@echo 'RIOTBASE:  $(RIOTBASE)'
 	@echo 'RIOTBOARD: $(RIOTBOARD)'
+	@echo 'BOARDSDIR: $(BOARDSDIR)'
 	@echo 'RIOTCPU:   $(RIOTCPU)'
 	@echo 'RIOTPKG:   $(RIOTPKG)'
 	@echo ''

makefiles/scan-build.inc.mk

@@ -7,6 +7,7 @@ SCANBUILD_ENV_VARS := \
   BINDIR \
   BINDIRBASE \
   BOARD \
+  BOARDSDIR \
   BUILD_DIR \
   BUILDRELPATH \
   CC \