blob.inc.mk

 
 
# use "blobs/blob" so the headers can be included as "blob/foo.h", but
# we don't have to add $(BINDIR)/$(MODULE) to the include path.
BLOB_HDR_DIR ?= $(BINDIR)/$(MODULE)/blobs/blob
BLOB_H := $(BLOBS:%=$(BLOB_HDR_DIR)/%.h)
 
ifneq (, $(BLOB_H))
  # add $(BINDIR)/$(MODULE)/blobs to include path
  CFLAGS += -I$(dir $(BLOB_HDR_DIR))
endif
 
# In order to allow automatic folder creation in subtrees,
# this Makefile makes use SECONDEXPANSION, PRECIOUS and
# order only prerequisites.
# Folder targets are "tagged" by appending "/."
# The final recipe uses "| $$(@D)/." to create necessary trees.
#
# Inspiration from:
# http://ismail.badawi.io/blog/2017/03/28/automatic-directory-creation-in-make/
#
.PRECIOUS: $(BLOB_HDR_DIR)/. $(BLOB_HDR_DIR)%/.
 
$(BLOB_HDR_DIR)/.:
    @mkdir -p $@
 
$(BLOB_HDR_DIR)%/.:
    @mkdir -p $@
 
XXD ?= xxd
 
$(BLOB_H): $(BLOB_HDR_DIR)/%.h: % $(BLOBS) | $$(@D)/.
    @command -v $(XXD) > /dev/null 2>&1 || ( \
      echo "error: xxd binary '$(XXD)' not found! (Maybe install vim package?)"; exit 1)
 
    ${Q}cd $(dir $<); xxd -i $(notdir $<) | sed 's/^unsigned/const unsigned/g'> $@
 
# make C and C++ objects of this module depend on generated headers, so they
# get re-build on changes to the blob files.
$(OBJC) $(OBJCXX): $(BLOB_H)