make/component_wrapper.mk

   1 # Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
   2 # Copyright 2018 apeos contributors
   3 #
   4 # Component wrapper makefile
   5 #
   6 # This makefile gets called recursively from the project make, once for each component.
   7 # COMPONENT_MAKEFILE is set to point at the component.mk file for the component itself,
   8 # which is included as part of this process (after default variables are defined).
   9 #
  10 # This makefile comprises multiple stages, marked in blocked comments below.
  11 #
  12 # CWD is the build directory of the component.
  13 #
  14 # Licensed under the Apache License, Version 2.0 (the "License");
  15 # you may not use this file except in compliance with the License.
  16 # You may obtain a copy of the License at
  17 #
  18 #     http://www.apache.org/licenses/LICENSE-2.0
  19 #
  20 # Unless required by applicable law or agreed to in writing, software
  21 # distributed under the License is distributed on an "AS IS" BASIS,
  22 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  23 # See the License for the specific language governing permissions and
  24 # limitations under the License.
  25
  26 ifndef PROJECT_PATH
  27 $(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.)
  28 endif
  29
  30
  31 ################################################################################
  32 # 1) Set default variables for the component build (including configuration
  33 #       loaded from sdkconfig.)
  34 ################################################################################
  35
  36 # Find the path to the component
  37 COMPONENT_PATH := $(abspath $(dir $(COMPONENT_MAKEFILE)))
  38 export COMPONENT_PATH
  39
  40 # COMPONENT_BUILD_DIR is otherwise known as CWD for the build
  41 COMPONENT_BUILD_DIR := $(abspath .)
  42
  43 # include elements common to both project & component makefiles
  44 # (includes project configuration set via menuconfig)
  45 include $(IDF_PATH)/make/common.mk
  46
  47 # Some of the following defaults may be overriden by the component's component.mk makefile,
  48 # during the next step:
  49
  50 # Absolute path of the .a file
  51 COMPONENT_LIBRARY = lib$(COMPONENT_NAME).a
  52
  53 # Source dirs a component has. Default to root directory of component.
  54 COMPONENT_SRCDIRS = .
  55
  56 #Names of binary & text files to embed as raw content in the component library
  57 COMPONENT_EMBED_FILES ?=
  58 COMPONENT_EMBED_TXTFILES ?=
  59
  60 # By default, include only the include/ dir.
  61 COMPONENT_ADD_INCLUDEDIRS = include
  62 COMPONENT_ADD_LDFLAGS = -l$(COMPONENT_NAME)
  63
  64 # Define optional compiling macros
  65 define compile_exclude
  66 COMPONENT_OBJEXCLUDE += $(1)
  67 endef
  68
  69 define compile_include
  70 COMPONENT_OBJINCLUDE += $(1)
  71 endef
  72
  73 define compile_only_if
  74 $(eval $(if $(1), $(call compile_include, $(2)), $(call compile_exclude, $(2))))
  75 endef
  76
  77 define compile_only_if_not
  78 $(eval $(if $(1), $(call compile_exclude, $(2)), $(call compile_include, $(2))))
  79 endef
  80
  81 COMPONENT_ADD_LINKER_DEPS ?=
  82 COMPONENT_DEPENDS ?=
  83 COMPONENT_EXTRA_CLEAN ?=
  84 COMPONENT_EXTRA_INCLUDES ?=
  85 COMPONENT_OBJEXCLUDE ?=
  86 COMPONENT_OBJINCLUDE ?=
  87 COMPONENT_SUBMODULES ?=
  88
  89 ################################################################################
  90 # 2) Include the component.mk for the specific component (COMPONENT_MAKEFILE) to
  91 #     override variables & optionally define custom targets. Also include global
  92 #     component makefiles.
  93 ################################################################################
  94
  95
  96 # Include any Makefile.componentbuild file letting components add
  97 # configuration at the global component level
  98
  99 # Save component_path; we pass it to the called Makefile.componentbuild
 100 # as COMPILING_COMPONENT_PATH, and we use it to restore the current
 101 # COMPONENT_PATH later.
 102 COMPILING_COMPONENT_PATH := $(COMPONENT_PATH)
 103
 104 define includeCompBuildMakefile
 105 $(if $(V),$(info including $(1)/Makefile.componentbuild...))
 106 COMPONENT_PATH := $(1)
 107 include $(1)/Makefile.componentbuild
 108 endef
 109 $(foreach componentpath,$(COMPONENT_PATHS), \
 110         $(if $(wildcard $(componentpath)/Makefile.componentbuild), \
 111                 $(eval $(call includeCompBuildMakefile,$(componentpath)))))
 112
 113 #Restore COMPONENT_PATH to what it was
 114 COMPONENT_PATH := $(COMPILING_COMPONENT_PATH)
 115
 116
 117 # Include component.mk for this component.
 118 include $(COMPONENT_MAKEFILE)
 119
 120
 121 ################################################################################
 122 # 3) Set variables that depend on values that may changed by component.mk
 123 ################################################################################
 124
 125 ifndef COMPONENT_CONFIG_ONLY  # Skip steps 3-5 if COMPONENT_CONFIG_ONLY is set
 126
 127 # Object files which need to be linked into the library
 128 # By default we take all .c, .cpp, .cc & .S files in COMPONENT_SRCDIRS.
 129 ifndef COMPONENT_OBJS
 130 # Find all source files in all COMPONENT_SRCDIRS
 131 COMPONENT_OBJS := $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.c,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.c)))
 132 COMPONENT_OBJS += $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.cpp,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.cpp)))
 133 COMPONENT_OBJS += $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.cc,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.cc)))
 134 COMPONENT_OBJS += $(foreach compsrcdir,$(COMPONENT_SRCDIRS),$(patsubst %.S,%.o,$(wildcard $(COMPONENT_PATH)/$(compsrcdir)/*.S)))
 135 # Make relative by removing COMPONENT_PATH from all found object paths
 136 COMPONENT_OBJS := $(patsubst $(COMPONENT_PATH)/%,%,$(COMPONENT_OBJS))
 137 else
 138 # Add in components defined by conditional compiling macros
 139 COMPONENT_OBJS += $(COMPONENT_OBJINCLUDE)
 140 endif
 141 # Remove items disabled by optional compilation
 142 COMPONENT_OBJS := $(foreach obj,$(COMPONENT_OBJS),$(if $(filter $(realpath $(obj)),$(realpath $(COMPONENT_OBJEXCLUDE))), ,$(obj)))
 143
 144 # Remove duplicates
 145 COMPONENT_OBJS := $(call uniq,$(COMPONENT_OBJS))
 146
 147
 148 # Object files with embedded binaries to add to the component library
 149 # Correspond to the files named in COMPONENT_EMBED_FILES & COMPONENT_EMBED_TXTFILES
 150 COMPONENT_EMBED_OBJS ?= $(addsuffix .bin.o,$(notdir $(COMPONENT_EMBED_FILES))) $(addsuffix .txt.o,$(notdir $(COMPONENT_EMBED_TXTFILES)))
 151
 152 # If we're called to compile something, we'll get passed the COMPONENT_INCLUDES
 153 # variable with all the include dirs from all the components in random order. This
 154 # means we can accidentally grab a header from another component before grabbing our own.
 155 # To make sure that does not happen, re-order the includes so ours come first.
 156 COMPONENT_PRIV_INCLUDEDIRS ?=
 157 OWN_INCLUDES:=$(abspath $(addprefix $(COMPONENT_PATH)/,$(COMPONENT_PRIV_INCLUDEDIRS) $(COMPONENT_ADD_INCLUDEDIRS)))
 158 COMPONENT_INCLUDES := $(OWN_INCLUDES) $(filter-out $(OWN_INCLUDES),$(COMPONENT_INCLUDES))
 159
 160
 161 ################################################################################
 162 # 4) Define a target to generate component_project_vars.mk Makefile which
 163 # contains common per-component settings which are included directly in the
 164 # top-level project make
 165 #
 166 # (Skipped if COMPONENT_CONFIG_ONLY is set.)
 167 ################################################################################
 168
 169 # macro to generate variable-relative paths inside component_project_vars.mk, whenever possible
 170 # ie put literal $(IDF_PATH), $(PROJECT_PATH) and $(BUILD_DIR_BASE) into the generated
 171 # makefiles where possible.
 172 #
 173 # This means if directories move (breaking absolute paths), don't need to 'make clean'
 174 define MakeVariablePath
 175 $(subst $(IDF_PATH),$$(IDF_PATH),$(subst $(PROJECT_PATH),$$(PROJECT_PATH),$(subst $(BUILD_DIR_BASE),$$(BUILD_DIR_BASE),$(1))))
 176 endef
 177
 178 # component_project_vars.mk target for the component. This is used to
 179 # take component.mk variables COMPONENT_ADD_INCLUDEDIRS,
 180 # COMPONENT_ADD_LDFLAGS, COMPONENT_DEPENDS and COMPONENT_SUBMODULES
 181 # and inject those into the project make pass.
 182 #
 183 # The target here has no dependencies, as the parent target in
 184 # project.mk evaluates dependencies before calling down to here. See
 185 # GenerateComponentTargets macro in project.mk.
 186 #
 187 # If you are thinking of editing the output of this target for a
 188 # component-specific feature, please don't! What you want is a
 189 # Makefile.projbuild for your component (see docs/build-system.rst for
 190 # more.)
 191 #
 192 # Note: The :: target here is not a mistake. This target should always be
 193 # executed, as dependencies are checked by the parent project-level make target.
 194 # See https://www.gnu.org/software/make/manual/make.html#index-_003a_003a-rules-_0028double_002dcolon_0029
 195 component_project_vars.mk::
 196         $(details) "Building component project variables list $(abspath $@)"
 197         @echo '# Automatically generated build file. Do not edit.' > $@
 198         @echo 'COMPONENT_INCLUDES += $(call MakeVariablePath,$(addprefix $(COMPONENT_PATH)/,$(COMPONENT_ADD_INCLUDEDIRS)))' >> $@
 199         @echo 'COMPONENT_LDFLAGS += $(call MakeVariablePath,-L$(COMPONENT_BUILD_DIR) $(COMPONENT_ADD_LDFLAGS))' >> $@
 200         @echo 'COMPONENT_LINKER_DEPS += $(call MakeVariablePath,$(call resolvepath,$(COMPONENT_ADD_LINKER_DEPS),$(COMPONENT_PATH)))' >> $@
 201         @echo 'COMPONENT_SUBMODULES += $(call MakeVariablePath,$(addprefix $(COMPONENT_PATH)/,$(COMPONENT_SUBMODULES)))' >> $@
 202         @echo 'COMPONENT_LIBRARIES += $(COMPONENT_NAME)' >> $@
 203         @echo 'component-$(COMPONENT_NAME)-build: $(addprefix component-,$(addsuffix -build,$(COMPONENT_DEPENDS)))' >> $@
 204
 205 ################################################################################
 206 # 5) Where COMPONENT_OWNBUILDTARGET / COMPONENT_OWNCLEANTARGET
 207 # is not set by component.mk, define default build, clean, etc. targets
 208 #
 209 # (Skipped if COMPONENT_CONFIG_ONLY is set.)
 210 ################################################################################
 211
 212 # Default build behaviour: define a phony build target and a COMPONENT_LIBRARY link target.
 213 ifndef COMPONENT_OWNBUILDTARGET
 214 .PHONY: build
 215 build: $(COMPONENT_LIBRARY)
 216
 217 # Build the archive. We remove the archive first, otherwise ar will get confused if we update
 218 # an archive when multiple filenames have the same name (src1/test.o and src2/test.o)
 219 $(COMPONENT_LIBRARY): $(COMPONENT_OBJS) $(COMPONENT_EMBED_OBJS)
 220         $(summary) AR $(patsubst $(PWD)/%,%,$(CURDIR))/$@
 221         rm -f $@
 222         $(AR) cru $@ $^
 223 endif
 224
 225 # If COMPONENT_OWNCLEANTARGET is not set, define a phony clean target
 226 ifndef COMPONENT_OWNCLEANTARGET
 227 CLEAN_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
 228 .PHONY: clean
 229 clean:
 230         $(summary) RM $(CLEAN_FILES)
 231         rm -f $(CLEAN_FILES)
 232 endif
 233
 234 DEBUG_FLAGS ?= -ggdb
 235
 236 # Include all dependency files already generated
 237 -include $(COMPONENT_OBJS:.o=.d)
 238
 239 # This is a fix for situation where the project or IDF dir moves, and instead
 240 # of rebuilding the target the build fails until make clean is run
 241 #
 242 # It adds an empty dependency rule for the (possibly non-existent) source file itself,
 243 # which prevents it not being found from failing the build
 244 #
 245 # $1 == Source File, $2 == .o file used for .d file name
 246 define AppendSourceToDependencies
 247 echo "$1:" >> $$(patsubst %.o,%.d,$2)
 248 endef
 249
 250
 251 # This pattern is generated for each COMPONENT_SRCDIR to compile the files in it.
 252 define GenerateCompileTargets
 253 # $(1) - directory containing source files, relative to $(COMPONENT_PATH) - one of $(COMPONENT_SRCDIRS)
 254 #
 255 $(1)/%.o: $$(COMPONENT_PATH)/$(1)/%.c $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(COMPONENT_SRCDIRS)
 256         $$(summary) CC $$(patsubst $$(PWD)/%,%,$$(CURDIR))/$$@
 257         $$(CC) $$(CFLAGS) $$(CPPFLAGS) $$(addprefix -I ,$$(COMPONENT_INCLUDES)) $$(addprefix -I ,$$(COMPONENT_EXTRA_INCLUDES)) -I$(1) -c $$< -o $$@
 258         $(call AppendSourceToDependencies,$$<,$$@)
 259
 260 $(1)/%.o: $$(COMPONENT_PATH)/$(1)/%.cpp $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(COMPONENT_SRCDIRS)
 261         $$(summary) CXX $$(patsubst $$(PWD)/%,%,$$(CURDIR))/$$@
 262         $$(CXX) $$(CXXFLAGS) $$(CPPFLAGS) $$(addprefix -I,$$(COMPONENT_INCLUDES)) $$(addprefix -I,$$(COMPONENT_EXTRA_INCLUDES)) -I$(1) -c $$< -o $$@
 263         $(call AppendSourceToDependencies,$$<,$$@)
 264
 265 $(1)/%.o: $$(COMPONENT_PATH)/$(1)/%.cc $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(COMPONENT_SRCDIRS)
 266         $$(summary) CXX $$(patsubst $$(PWD)/%,%,$$(CURDIR))/$$@
 267         $$(CXX) $$(CXXFLAGS) $$(CPPFLAGS) $$(addprefix -I,$$(COMPONENT_INCLUDES)) $$(addprefix -I,$$(COMPONENT_EXTRA_INCLUDES)) -I$(1) -c $$< -o $$@
 268         $(call AppendSourceToDependencies,$$<,$$@)
 269
 270 $(1)/%.o: $$(COMPONENT_PATH)/$(1)/%.S $(COMMON_MAKEFILES) $(COMPONENT_MAKEFILE) | $(COMPONENT_SRCDIRS)
 271         $$(summary) AS $$(patsubst $$(PWD)/%,%,$$(CURDIR))/$$@
 272         $$(CC) $$(CPPFLAGS) $$(DEBUG_FLAGS) $$(addprefix -I ,$$(COMPONENT_INCLUDES)) $$(addprefix -I ,$$(COMPONENT_EXTRA_INCLUDES)) -I$(1) -c $$< -o $$@
 273         $(call AppendSourceToDependencies,$$<,$$@)
 274
 275 # CWD is build dir, create the build subdirectory if it doesn't exist
 276 #
 277 # (NB: Each .o file depends on all relative component build dirs $(COMPONENT_SRCDIRS), rather than just $(1), to work
 278 # around a behaviour make 3.81 where the first pattern (randomly) seems to be matched rather than the best fit. ie if
 279 # 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
 280 # created but wouldn't be created if $(1)=a. Make 4.x doesn't have this problem, it seems to preferentially
 281 # choose the better match ie $(1)=a/b and %=c )
 282 #
 283 $(1):
 284         mkdir -p $(1)
 285 endef
 286
 287 # Generate all the compile target patterns
 288 $(foreach srcdir,$(COMPONENT_SRCDIRS), $(eval $(call GenerateCompileTargets,$(srcdir))))
 289
 290 ## Support for embedding binary files into the ELF as symbols
 291
 292 OBJCOPY_EMBED_ARGS := --input-target binary --output-target elf32-xtensa-le --binary-architecture xtensa --rename-section .data=.rodata.embedded
 293
 294 # Generate pattern for embedding text or binary files into the app
 295 # $(1) is name of file (as relative path inside component)
 296 # $(2) is txt or bin depending on file contents
 297 #
 298 # txt files are null-terminated before being embedded (otherwise
 299 # identical behaviour.)
 300 #
 301 define GenerateEmbedTarget
 302
 303 # copy the input file into the build dir (using a subdirectory
 304 # in case the file already exists elsewhere in the build dir)
 305 embed_bin/$$(notdir $(1)): $(call resolvepath,$(1),$(COMPONENT_PATH)) | embed_bin
 306         cp $$< $$@
 307
 308 embed_txt/$$(notdir $(1)): $(call resolvepath,$(1),$(COMPONENT_PATH)) | embed_txt
 309         cp $$< $$@
 310         printf '\0' >> $$@  # null-terminate text files
 311
 312 # messing about with the embed_X subdirectory then using 'cd' for objcopy is because the
 313 # full path passed to OBJCOPY makes it into the name of the symbols in the .o file
 314 $$(notdir $(1)).$(2).o: embed_$(2)/$$(notdir $(1))
 315         $(summary) EMBED $$(patsubst $$(PWD)/%,%,$$(CURDIR))/$$@
 316         cd embed_$(2); $(OBJCOPY) $(OBJCOPY_EMBED_ARGS) $$(notdir $$<) ../$$@
 317
 318 CLEAN_FILES += embed_$(2)/$$(notdir $(1))
 319 endef
 320
 321 embed_txt embed_bin:
 322         mkdir -p $@
 323
 324 # generate targets to embed binary & text files
 325 $(foreach binfile,$(COMPONENT_EMBED_FILES), $(eval $(call GenerateEmbedTarget,$(binfile),bin)))
 326
 327 $(foreach txtfile,$(COMPONENT_EMBED_TXTFILES), $(eval $(call GenerateEmbedTarget,$(txtfile),txt)))
 328
 329 else   # COMPONENT_CONFIG_ONLY is set
 330
 331 build:
 332         $(details) "No build needed for $(COMPONENT_NAME) (COMPONENT_CONFIG_ONLY)"
 333
 334 clean:
 335         $(summary) RM component_project_vars.mk
 336         rm -f component_project_vars.mk
 337
 338 component_project_vars.mk::  # no need to add variables via component.mk
 339         @echo '# COMPONENT_CONFIG_ONLY target sets no variables here' > $@
 340
 341 endif  # COMPONENT_CONFIG_ONLY
 342