1# Component wrapper makefile 2# 3# This makefile gets called recursively from the project make, once for each component. 4# COMPONENT_MAKEFILE is set to point at the component.mk file for the component itself, 5# which is included as part of this process (after default variables are defined). 6# 7# This makefile comprises multiple stages, marked in blocked comments below. 8# 9# CWD is the build directory of the component. 10 11ifndef PROJECT_PATH 12$(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.) 13endif 14 15 16################################################################################ 17# 1) Set default variables for the component build (including configuration 18# loaded from sdkconfig.) 19################################################################################ 20 21# Find the path to the component 22COMPONENT_PATH := $(abspath $(dir $(COMPONENT_MAKEFILE))) 23export COMPONENT_PATH 24 25# COMPONENT_BUILD_DIR is otherwise known as CWD for the build 26COMPONENT_BUILD_DIR := $(abspath .) 27 28# include elements common to both project & component makefiles 29# (includes project configuration set via menuconfig) 30include $(IDF_PATH)/make/common.mk 31 32# Some of the following defaults may be overriden by the component's component.mk makefile, 33# during the next step: 34 35# Absolute path of the .a file 36COMPONENT_LIBRARY = lib$(COMPONENT_NAME).a 37 38# Source dirs a component has. Default to root directory of component. 39COMPONENT_SRCDIRS = . 40 41#Names of binary & text files to embed as raw content in the component library 42COMPONENT_EMBED_FILES ?= 43COMPONENT_EMBED_TXTFILES ?= 44 45# By default, include only the include/ dir. 46COMPONENT_ADD_INCLUDEDIRS = include 47COMPONENT_ADD_LDFLAGS = -l$(COMPONENT_NAME) 48 49# Name of the linker fragment files this component presents to the Linker 50# script generator 51COMPONENT_ADD_LDFRAGMENTS ?= 52 53# Define optional compiling macros 54define compile_exclude 55COMPONENT_OBJEXCLUDE += $(1) 56endef 57 58define compile_include 59COMPONENT_OBJINCLUDE += $(1) 60endef 61 62define compile_only_if 63$(eval $(if $(1), $(call compile_include, $(2)), $(call compile_exclude, $(2)))) 64endef 65 66define compile_only_if_not 67$(eval $(if $(1), $(call compile_exclude, $(2)), $(call compile_include, $(2)))) 68endef 69 70COMPONENT_ADD_LINKER_DEPS ?= 71COMPONENT_DEPENDS ?= 72COMPONENT_EXTRA_CLEAN ?= 73COMPONENT_EXTRA_INCLUDES ?= 74COMPONENT_OBJEXCLUDE ?= 75COMPONENT_OBJINCLUDE ?= 76COMPONENT_SUBMODULES ?= 77 78################################################################################ 79# 2) Include the component.mk for the specific component (COMPONENT_MAKEFILE) to 80# override variables & optionally define custom targets. Also include global 81# component makefiles. 82################################################################################ 83 84 85# Include any Makefile.componentbuild file letting components add 86# configuration at the global component level 87 88# Save component_path; we pass it to the called Makefile.componentbuild 89# as COMPILING_COMPONENT_PATH, and we use it to restore the current 90# COMPONENT_PATH later. 91COMPILING_COMPONENT_PATH := $(COMPONENT_PATH) 92 93define includeCompBuildMakefile 94ifeq ("$(V)","1") 95$$(info including $(1)/Makefile.componentbuild...) 96endif 97COMPONENT_PATH := $(1) 98include $(1)/Makefile.componentbuild 99endef 100$(foreach componentpath,$(COMPONENT_PATHS), \ 101 $(if $(wildcard $(componentpath)/Makefile.componentbuild), \ 102 $(eval $(call includeCompBuildMakefile,$(componentpath))))) 103 104#Restore COMPONENT_PATH to what it was 105COMPONENT_PATH := $(COMPILING_COMPONENT_PATH) 106 107 108# Include component.mk for this component. 109include $(COMPONENT_MAKEFILE) 110 111 112################################################################################ 113# 3) Set variables that depend on values that may changed by component.mk 114################################################################################ 115 116ifndef COMPONENT_CONFIG_ONLY # Skip steps 3-5 if COMPONENT_CONFIG_ONLY is set 117 118# Object files which need to be linked into the library 119# By default we take all .c, .cpp, .cc & .S files in COMPONENT_SRCDIRS. 120ifndef COMPONENT_OBJS 121# Find all source files in all COMPONENT_SRCDIRS 122COMPONENT_OBJS := $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.c,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.c))) 123COMPONENT_OBJS += $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.cpp,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.cpp))) 124COMPONENT_OBJS += $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.cc,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.cc))) 125COMPONENT_OBJS += $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.S,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.S))) 126# Make relative by removing COMPONENT_PATH from all found object paths 127COMPONENT_OBJS := $(patsubst $(COMPONENT_PATH)/%,%,$(COMPONENT_OBJS)) 128else 129# Add in components defined by conditional compiling macros 130COMPONENT_OBJS += $(COMPONENT_OBJINCLUDE) 131endif 132# Remove any leading ../ from paths, so everything builds inside build dir 133COMPONENT_OBJS := $(call stripLeadingParentDirs,$(COMPONENT_OBJS)) 134 135# Do the same for COMPONENT_OBJEXCLUDE (used below) 136COMPONENT_OBJEXCLUDE := $(call stripLeadingParentDirs,$(COMPONENT_OBJEXCLUDE)) 137 138# COMPONENT_OBJDIRS is COMPONENT_SRCDIRS with the same transform applied 139COMPONENT_OBJDIRS := $(call stripLeadingParentDirs,$(COMPONENT_SRCDIRS)) 140 141# Remove items disabled by optional compilation 142COMPONENT_OBJS := $(foreach obj,$(COMPONENT_OBJS),$(if $(filter $(abspath $(obj)),$(abspath $(COMPONENT_OBJEXCLUDE))), ,$(obj))) 143 144# Remove duplicates 145COMPONENT_OBJS := $(call uniq,$(COMPONENT_OBJS)) 146 147# Object files with embedded binaries to add to the component library 148# Correspond to the files named in COMPONENT_EMBED_FILES & COMPONENT_EMBED_TXTFILES 149COMPONENT_EMBED_OBJS ?= $(addsuffix .bin.o,$(notdir $(COMPONENT_EMBED_FILES))) $(addsuffix .txt.o,$(notdir $(COMPONENT_EMBED_TXTFILES))) 150 151# If we're called to compile something, we'll get passed the COMPONENT_INCLUDES 152# variable with all the include dirs from all the components in random order. This 153# means we can accidentally grab a header from another component before grabbing our own. 154# To make sure that does not happen, re-order the includes so ours come first. 155COMPONENT_PRIV_INCLUDEDIRS ?= 156OWN_INCLUDES:=$(abspath $(addprefix $(COMPONENT_PATH)/,$(COMPONENT_PRIV_INCLUDEDIRS) $(COMPONENT_ADD_INCLUDEDIRS))) 157COMPONENT_INCLUDES := $(OWN_INCLUDES) $(filter-out $(OWN_INCLUDES),$(COMPONENT_INCLUDES)) 158 159 160################################################################################ 161# 4) Define a target to generate component_project_vars.mk Makefile which 162# contains common per-component settings which are included directly in the 163# top-level project make 164# 165# (Skipped if COMPONENT_CONFIG_ONLY is set.) 166################################################################################ 167 168# macro to generate variable-relative paths inside component_project_vars.mk, whenever possible 169# ie put literal $(IDF_PATH), $(PROJECT_PATH) and $(BUILD_DIR_BASE) into the generated 170# makefiles where possible. 171# 172# This means if directories move (breaking absolute paths), don't need to 'make clean' 173define MakeVariablePath 174$(subst $(IDF_PATH),$$(IDF_PATH),$(subst $(PROJECT_PATH),$$(PROJECT_PATH),$(subst $(BUILD_DIR_BASE),$$(BUILD_DIR_BASE),$(1)))) 175endef 176 177# component_project_vars.mk target for the component. This is used to 178# take component.mk variables COMPONENT_ADD_INCLUDEDIRS, 179# COMPONENT_ADD_LDFLAGS, COMPONENT_DEPENDS and COMPONENT_SUBMODULES 180# and inject those into the project make pass. 181# 182# The target here has no dependencies, as the parent target in 183# project.mk evaluates dependencies before calling down to here. See 184# GenerateComponentTargets macro in project.mk. 185# 186# If you are thinking of editing the output of this target for a 187# component-specific feature, please don't! What you want is a 188# Makefile.projbuild for your component (see docs/build-system.rst for 189# more.) 190# 191# Note: The :: target here is not a mistake. This target should always be 192# executed, as dependencies are checked by the parent project-level make target. 193# See https://www.gnu.org/software/make/manual/make.html#index-_003a_003a-rules-_0028double_002dcolon_0029 194component_project_vars.mk:: 195 $(details) "Building component project variables list $(abspath $@)" 196 @echo '# Automatically generated build file. Do not edit.' > $@ 197 @echo 'COMPONENT_INCLUDES += $(call MakeVariablePath,$(abspath $(addprefix $(COMPONENT_PATH)/,$(COMPONENT_ADD_INCLUDEDIRS))))' >> $@ 198 @echo 'COMPONENT_LDFLAGS += $(call MakeVariablePath,-L$(COMPONENT_BUILD_DIR) $(COMPONENT_ADD_LDFLAGS))' >> $@ 199 @echo 'COMPONENT_LINKER_DEPS += $(call MakeVariablePath,$(call resolvepath,$(COMPONENT_ADD_LINKER_DEPS),$(COMPONENT_PATH)))' >> $@ 200 @echo 'COMPONENT_SUBMODULES += $(call MakeVariablePath,$(abspath $(addprefix $(COMPONENT_PATH)/,$(COMPONENT_SUBMODULES))))' >> $@ 201 @echo 'COMPONENT_LIBRARIES += $(COMPONENT_NAME)' >> $@ 202 @echo 'COMPONENT_LDFRAGMENTS += $(call MakeVariablePath,$(abspath $(addprefix $(COMPONENT_PATH)/,$(COMPONENT_ADD_LDFRAGMENTS))))' >> $@ 203 @echo 'component-$(COMPONENT_NAME)-build: $(addprefix component-,$(addsuffix -build,$(COMPONENT_DEPENDS)))' >> $@ 204################################################################################ 205# 5) Where COMPONENT_OWNBUILDTARGET / COMPONENT_OWNCLEANTARGET 206# is not set by component.mk, define default build, clean, etc. targets 207# 208# (Skipped if COMPONENT_CONFIG_ONLY is set.) 209################################################################################ 210 211# Default build behaviour: define a phony build target and a COMPONENT_LIBRARY link target. 212ifndef COMPONENT_OWNBUILDTARGET 213.PHONY: build 214build: $(COMPONENT_LIBRARY) 215 216# Build the archive. We remove the archive first, otherwise ar will get confused if we update 217# an archive when multiple filenames have the same name (src1/test.o and src2/test.o) 218$(COMPONENT_LIBRARY): $(COMPONENT_OBJS) $(COMPONENT_EMBED_OBJS) 219 $(summary) AR $(patsubst $(PWD)/%,%,$(CURDIR))/$@ 220 rm -f $@ 221 $(AR) $(ARFLAGS) $@ $(COMPONENT_OBJS) $(COMPONENT_EMBED_OBJS) 222endif 223 224# If COMPONENT_OWNCLEANTARGET is not set, define a phony clean target 225ifndef COMPONENT_OWNCLEANTARGET 226CLEAN_FILES := $(COMPONENT_LIBRARY) $(COMPONENT_OBJS) $(COMPONENT_OBJS:.o=.d) $(COMPONENT_OBJEXCLUDE) $(COMPONENT_OBJEXCLUDE:.o=.d) $(COMPONENT_EMBED_OBJS) $(COMPONENT_EXTRA_CLEAN) component_project_vars.mk 227.PHONY: clean 228clean: 229 $(summary) RM $(CLEAN_FILES) 230 rm -f $(CLEAN_FILES) 231endif 232 233DEBUG_FLAGS ?= -ggdb 234 235# Include all dependency files already generated 236-include $(COMPONENT_OBJS:.o=.d) 237 238# This is a fix for situation where the project or IDF dir moves, and instead 239# of rebuilding the target the build fails until make clean is run 240# 241# It adds an empty dependency rule for the (possibly non-existent) source file itself, 242# which prevents it not being found from failing the build 243# 244# $1 == Source File, $2 == .o file used for .d file name 245define AppendSourceToDependencies 246echo "$1:" >> $$(patsubst %.o,%.d,$2) 247endef 248 249 250# This pattern is generated for each COMPONENT_SRCDIR to compile the files in it. 251define GenerateCompileTargets 252# $(1) - directory containing source files, relative to $(COMPONENT_PATH) - one of $(COMPONENT_SRCDIRS) 253# $(2) - output build directory, which is $(1) with any leading ".."s converted to "."s to ensure output is always under build/ 254# 255 256$(2)/%.o: $$(COMPONENT_PATH)/$(1)/%.c $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(COMPONENT_OBJDIRS) 257 $$(summary) CC $$(patsubst $$(PWD)/%,%,$$(CURDIR))/$$@ 258 $$(CC) $$(CFLAGS) $$(CPPFLAGS) $$(addprefix -I ,$$(COMPONENT_INCLUDES)) $$(addprefix -I ,$$(COMPONENT_EXTRA_INCLUDES)) -I $(1) -c $$(abspath $$<) -o $$@ 259 $(call AppendSourceToDependencies,$$<,$$@) 260 261$(2)/%.o: $$(COMPONENT_PATH)/$(1)/%.cpp $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(COMPONENT_OBJDIRS) 262 $$(summary) CXX $$(patsubst $$(PWD)/%,%,$$(CURDIR))/$$@ 263 $$(CXX) $$(CXXFLAGS) $$(CPPFLAGS) $$(addprefix -I ,$$(COMPONENT_INCLUDES)) $$(addprefix -I ,$$(COMPONENT_EXTRA_INCLUDES)) -I $(1) -c $$(abspath $$<) -o $$@ 264 $(call AppendSourceToDependencies,$$<,$$@) 265 266$(2)/%.o: $$(COMPONENT_PATH)/$(1)/%.cc $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(COMPONENT_OBJDIRS) 267 $$(summary) CXX $$(patsubst $$(PWD)/%,%,$$(CURDIR))/$$@ 268 $$(CXX) $$(CXXFLAGS) $$(CPPFLAGS) $$(addprefix -I ,$$(COMPONENT_INCLUDES)) $$(addprefix -I ,$$(COMPONENT_EXTRA_INCLUDES)) -I $(1) -c $$(abspath $$<) -o $$@ 269 $(call AppendSourceToDependencies,$$<,$$@) 270 271$(2)/%.o: $$(COMPONENT_PATH)/$(1)/%.S $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(COMPONENT_OBJDIRS) 272 $$(summary) AS $$(patsubst $$(PWD)/%,%,$$(CURDIR))/$$@ 273 $$(CC) $$(CPPFLAGS) $$(DEBUG_FLAGS) $$(addprefix -I ,$$(COMPONENT_INCLUDES)) $$(addprefix -I ,$$(COMPONENT_EXTRA_INCLUDES)) -I $(1) -c $$(abspath $$<) -o $$@ 274 $(call AppendSourceToDependencies,$$<,$$@) 275 276# CWD is build dir, create the build subdirectory if it doesn't exist 277# 278# (NB: Each .o file depends on all relative component build dirs $(COMPONENT_OBJDIRS), including $(2), to work 279# around a behaviour make 3.81 where the first pattern (randomly) seems to be matched rather than the best fit. ie if 280# you have objects a/y.o and a/b/c.o then c.o can be matched with $(1)=a & %=b/c, meaning that subdir 'a/b' needs to be 281# created but wouldn't be created if $(2)=a. Make 4.x doesn't have this problem, it seems to preferentially 282# choose the better match ie $(2)=a/b and %=c ) 283# 284# Note: This may cause some issues for out-of-tree source files and make 3.81 :/ 285# 286$(2): 287 mkdir -p $(2) 288endef 289 290# Generate all the compile target patterns 291$(foreach srcdir,$(COMPONENT_SRCDIRS), $(eval $(call GenerateCompileTargets,$(srcdir),$(call stripLeadingParentDirs,$(srcdir))))) 292 293## Support for embedding binary files into the ELF as symbols 294 295OBJCOPY_EMBED_ARGS := --input-target binary --output-target elf32-xtensa-le --binary-architecture xtensa --rename-section .data=.rodata.embedded 296 297# Generate pattern for embedding text or binary files into the app 298# $(1) is name of file (as relative path inside component) 299# $(2) is txt or bin depending on file contents 300# 301# txt files are null-terminated before being embedded (otherwise 302# identical behaviour.) 303# 304define GenerateEmbedTarget 305 306# copy the input file into the build dir (using a subdirectory 307# in case the file already exists elsewhere in the build dir) 308embed_bin/$$(notdir $(1)): $(call resolvepath,$(1),$(COMPONENT_PATH)) | embed_bin 309 cp $$< $$@ 310 311embed_txt/$$(notdir $(1)): $(call resolvepath,$(1),$(COMPONENT_PATH)) | embed_txt 312 cp $$< $$@ 313 printf '\0' >> $$@ # null-terminate text files 314 315# messing about with the embed_X subdirectory then using 'cd' for objcopy is because the 316# full path passed to OBJCOPY makes it into the name of the symbols in the .o file 317$$(notdir $(1)).$(2).o: embed_$(2)/$$(notdir $(1)) 318 $(summary) EMBED $$(patsubst $$(PWD)/%,%,$$(CURDIR))/$$@ 319 cd embed_$(2); $(OBJCOPY) $(OBJCOPY_EMBED_ARGS) $$(notdir $$<) ../$$@ 320 321CLEAN_FILES += embed_$(2)/$$(notdir $(1)) 322endef 323 324embed_txt embed_bin: 325 mkdir -p $@ 326 327# generate targets to embed binary & text files 328$(foreach binfile,$(COMPONENT_EMBED_FILES), $(eval $(call GenerateEmbedTarget,$(binfile),bin))) 329 330$(foreach txtfile,$(COMPONENT_EMBED_TXTFILES), $(eval $(call GenerateEmbedTarget,$(txtfile),txt))) 331 332else # COMPONENT_CONFIG_ONLY is set 333 334build: 335 $(details) "No build needed for $(COMPONENT_NAME) (COMPONENT_CONFIG_ONLY)" 336 337clean: 338 $(summary) RM component_project_vars.mk 339 rm -f component_project_vars.mk 340 341component_project_vars.mk:: # no need to add variables via component.mk 342 @echo '# COMPONENT_CONFIG_ONLY target sets no variables here' > $@ 343 344endif # COMPONENT_CONFIG_ONLY 345
