218 lines
9.9 KiB
Makefile
218 lines
9.9 KiB
Makefile
# Component wrapper makefile
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#
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# This makefile gets called recursively from the project make, once for each component.
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# COMPONENT_MAKEFILE is set to point at the component.mk file for the component itself,
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# which is included as part of this process (after default variables are defined).
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#
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# This makefile comprises multiple stages, marked in blocked comments below.
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#
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# CWD is the build directory of the component.
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ifndef PROJECT_PATH
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$(error Make was invoked from $(CURDIR). However please do not run make from the sdk or a component directory; invoke make from the project directory. See the ESP-IDF README for details.)
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endif
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################################################################################
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# 1) Set default variables for the component build (including configuration
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# loaded from sdkconfig.)
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################################################################################
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# Find the path to the component
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COMPONENT_PATH := $(abspath $(dir $(COMPONENT_MAKEFILE)))
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export COMPONENT_PATH
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# COMPONENT_BUILD_DIR is otherwise known as CWD for the build
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COMPONENT_BUILD_DIR := $(abspath .)
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# include elements common to both project & component makefiles
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# (includes project configuration set via menuconfig)
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include $(IDF_PATH)/make/common.mk
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# Some of the following defaults may be overriden by the component's component.mk makefile,
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# during the next step:
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# Absolute path of the .a file
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COMPONENT_LIBRARY = lib$(COMPONENT_NAME).a
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# Source dirs a component has. Default to root directory of component.
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COMPONENT_SRCDIRS = .
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#Names of binary & text files to embed as raw content in the component library
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COMPONENT_EMBED_FILES ?=
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COMPONENT_EMBED_TXTFILES ?=
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# By default, include only the include/ dir.
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COMPONENT_ADD_INCLUDEDIRS = include
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COMPONENT_ADD_LDFLAGS = -l$(COMPONENT_NAME)
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################################################################################
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# 2) Include the component.mk for the specific component (COMPONENT_MAKEFILE) to
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# override variables & optionally define custom targets.
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################################################################################
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include $(COMPONENT_MAKEFILE)
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################################################################################
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# 3) Set variables that depend on values that may changed by component.mk
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################################################################################
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# Object files which need to be linked into the library
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# By default we take all .c, .cpp & .S files in COMPONENT_SRCDIRS.
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ifndef COMPONENT_OBJS
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# Find all source files in all COMPONENT_SRCDIRS
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COMPONENT_OBJS := $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.c,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.c)))
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COMPONENT_OBJS += $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.cpp,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.cpp)))
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COMPONENT_OBJS += $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.S,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.S)))
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# Make relative by removing COMPONENT_PATH from all found object paths
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COMPONENT_OBJS := $(patsubst $(COMPONENT_PATH)/%,%,$(COMPONENT_OBJS))
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endif
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# Object files with embedded binaries to add to the component library
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# Correspond to the files named in COMPONENT_EMBED_FILES & COMPONENT_EMBED_TXTFILES
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COMPONENT_EMBED_OBJS ?= $(addsuffix .bin.o,$(notdir $(COMPONENT_EMBED_FILES))) $(addsuffix .txt.o,$(notdir $(COMPONENT_EMBED_TXTFILES)))
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# If we're called to compile something, we'll get passed the COMPONENT_INCLUDES
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# variable with all the include dirs from all the components in random order. This
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# means we can accidentally grab a header from another component before grabbing our own.
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# To make sure that does not happen, re-order the includes so ours come first.
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OWN_INCLUDES:=$(abspath $(addprefix $(COMPONENT_PATH)/,$(COMPONENT_ADD_INCLUDEDIRS) $(COMPONENT_PRIV_INCLUDEDIRS)))
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COMPONENT_INCLUDES := $(OWN_INCLUDES) $(filter-out $(OWN_INCLUDES),$(COMPONENT_INCLUDES))
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################################################################################
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# 4) Define a target to generate component_project_vars.mk Makefile which
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# contains common per-component settings which are included directly in the
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# top-level project make
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################################################################################
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# macro to generate variable-relative paths inside component_project_vars.mk, whenever possible
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# ie put literal $(IDF_PATH), $(PROJECT_PATH) and $(BUILD_DIR_BASE) into the generated
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# makefiles where possible.
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#
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# This means if directories move (breaking absolute paths), don't need to 'make clean'
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define MakeVariablePath
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$(subst $(IDF_PATH),$$(IDF_PATH),$(subst $(PROJECT_PATH),$$(PROJECT_PATH),$(subst $(BUILD_DIR_BASE),$$(BUILD_DIR_BASE),$(1))))
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endef
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# component_project_vars.mk target for the component. This is used to
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# take component.mk variables COMPONENT_ADD_INCLUDEDIRS,
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# COMPONENT_ADD_LDFLAGS, COMPONENT_DEPENDS and COMPONENT_SUBMODULES
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# and inject those into the project make pass.
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#
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# The target here has no dependencies, as the parent target in
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# project.mk evaluates dependencies before calling down to here. See
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# GenerateComponentTargets macro in project.mk.
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#
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# If you are thinking of editing the output of this target for a
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# component-specific feature, please don't! What you want is a
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# Makefile.projbuild for your component (see docs/build-system.rst for
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# more.)
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component_project_vars.mk::
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$(details) "Building component project variables list $(abspath $@)"
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@echo '# Automatically generated build file. Do not edit.' > $@
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@echo 'COMPONENT_INCLUDES += $(call MakeVariablePath,$(addprefix $(COMPONENT_PATH)/,$(COMPONENT_ADD_INCLUDEDIRS)))' >> $@
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@echo 'COMPONENT_LDFLAGS += $(call MakeVariablePath,$(COMPONENT_ADD_LDFLAGS))' >> $@
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@echo 'COMPONENT_LINKER_DEPS += $(call MakeVariablePath,$(call resolvepath,$(COMPONENT_ADD_LINKER_DEPS),$(COMPONENT_PATH)))' >> $@
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@echo 'COMPONENT_SUBMODULES += $(call MakeVariablePath,$(addprefix $(COMPONENT_PATH)/,$(COMPONENT_SUBMODULES)))' >> $@
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@echo '$(COMPONENT_NAME)-build: $(addsuffix -build,$(COMPONENT_DEPENDS))' >> $@
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################################################################################
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# 5) If COMPONENT_OWNBUILDTARGET / COMPONENT_OWNCLEANTARGET is not set by component.mk,
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# define default build, clean, etc. targets
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################################################################################
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# If COMPONENT_OWNBUILDTARGET is not set, define a phony build target and
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# a COMPONENT_LIBRARY link target.
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ifndef COMPONENT_OWNBUILDTARGET
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.PHONY: build
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build: $(COMPONENT_LIBRARY)
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@mkdir -p $(COMPONENT_SRCDIRS)
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# Build the archive. We remove the archive first, otherwise ar will get confused if we update
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# an archive when multiple filenames have the same name (src1/test.o and src2/test.o)
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$(COMPONENT_LIBRARY): $(COMPONENT_OBJS) $(COMPONENT_EMBED_OBJS)
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$(summary) AR $@
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rm -f $@
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$(AR) cru $@ $^
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endif
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# If COMPONENT_OWNCLEANTARGET is not set, define a phony clean target
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ifndef COMPONENT_OWNCLEANTARGET
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CLEAN_FILES = $(COMPONENT_LIBRARY) $(COMPONENT_OBJS) $(COMPONENT_OBJS:.o=.d) $(COMPONENT_EMBED_OBJS) $(COMPONENT_EXTRA_CLEAN) component_project_vars.mk
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.PHONY: clean
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clean:
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$(summary) RM $(CLEAN_FILES)
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rm -f $(CLEAN_FILES)
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endif
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# Include all dependency files already generated
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-include $(COMPONENT_OBJS:.o=.d)
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# This pattern is generated for each COMPONENT_SRCDIR to compile the files in it.
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define GenerateCompileTargets
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# $(1) - directory containing source files, relative to $(COMPONENT_PATH)
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$(1)/%.o: $$(COMPONENT_PATH)/$(1)/%.c $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(1)
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$$(summary) CC $$@
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$$(CC) $$(CFLAGS) $$(CPPFLAGS) $$(addprefix -I ,$$(COMPONENT_INCLUDES)) $$(addprefix -I ,$$(COMPONENT_EXTRA_INCLUDES)) -I$(1) -c $$< -o $$@
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$(1)/%.o: $$(COMPONENT_PATH)/$(1)/%.cpp $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(1)
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$$(summary) CXX $$@
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$$(CXX) $$(CXXFLAGS) $$(CPPFLAGS) $$(addprefix -I,$$(COMPONENT_INCLUDES)) $$(addprefix -I,$$(COMPONENT_EXTRA_INCLUDES)) -I$(1) -c $$< -o $$@
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$(1)/%.o: $$(COMPONENT_PATH)/$(1)/%.S $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(1)
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$$(summary) AS $$@
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$$(CC) $$(CPPFLAGS) $$(addprefix -I ,$$(COMPONENT_INCLUDES)) $$(addprefix -I ,$$(COMPONENT_EXTRA_INCLUDES)) -I$(1) -c $$< -o $$@
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# CWD is build dir, create the build subdirectory if it doesn't exist
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$(1):
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@mkdir -p $(1)
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endef
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# Generate all the compile target patterns
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$(foreach srcdir,$(COMPONENT_SRCDIRS), $(eval $(call GenerateCompileTargets,$(srcdir))))
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## Support for embedding binary files into the ELF as symbols
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OBJCOPY_EMBED_ARGS := --input-target binary --output-target elf32-xtensa-le --binary-architecture xtensa --rename-section .data=.rodata.embedded
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# Generate pattern for embedding text or binary files into the app
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# $(1) is name of file (as relative path inside component)
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# $(2) is txt or bin depending on file contents
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#
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# txt files are null-terminated before being embedded (otherwise
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# identical behaviour.)
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#
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define GenerateEmbedTarget
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# copy the input file into the build dir (using a subdirectory
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# in case the file already exists elsewhere in the build dir)
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embed_bin/$$(notdir $(1)): $(call resolvepath,$(1),$(COMPONENT_PATH)) | embed_bin
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cp $$< $$@
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embed_txt/$$(notdir $(1)): $(call resolvepath,$(1),$(COMPONENT_PATH)) | embed_txt
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cp $$< $$@
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printf '\0' >> $$@ # null-terminate text files
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# messing about with the embed_X subdirectory then using 'cd' for objcopy is because the
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# full path passed to OBJCOPY makes it into the name of the symbols in the .o file
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$$(notdir $(1)).$(2).o: embed_$(2)/$$(notdir $(1))
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$(summary) EMBED $$@
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cd embed_$(2); $(OBJCOPY) $(OBJCOPY_EMBED_ARGS) $$(notdir $$<) ../$$@
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CLEAN_FILES += embed_$(2)/$$(notdir $(1))
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endef
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embed_txt embed_bin:
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mkdir -p $@
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# generate targets to embed binary & text files
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$(foreach binfile,$(COMPONENT_EMBED_FILES), $(eval $(call GenerateEmbedTarget,$(binfile),bin)))
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$(foreach txtfile,$(COMPONENT_EMBED_TXTFILES), $(eval $(call GenerateEmbedTarget,$(txtfile),txt)))
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# generate targets to create binary embed directories
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$(foreach bindir,$(sort $(dir $(COMPONENT_EMBED_FILES))), $(eval $(call GenerateBuildDirTarget,$(bindir))))
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