lufa_build.mk 14.1 KB
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#
#             LUFA Library
#     Copyright (C) Dean Camera, 2012.
#
#  dean [at] fourwalledcubicle [dot] com
#           www.lufa-lib.org
#

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LUFA_BUILD_MODULES         += BUILD
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LUFA_BUILD_TARGETS         += size symbol-sizes all lib elf hex lss clean mostlyclean
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LUFA_BUILD_MANDATORY_VARS  += TARGET ARCH MCU SRC F_USB LUFA_PATH
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LUFA_BUILD_OPTIONAL_VARS   += BOARD OPTIMIZATION C_STANDARD CPP_STANDARD F_CPU C_FLAGS CPP_FLAGS ASM_FLAGS CC_FLAGS LD_FLAGS OBJDIR OBJECT_FILES DEBUG_TYPE DEBUG_LEVEL
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LUFA_BUILD_PROVIDED_VARS   += 
LUFA_BUILD_PROVIDED_MACROS += 
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# -----------------------------------------------------------------------------
#               LUFA GCC Compiler Buildsystem Makefile Module.
# -----------------------------------------------------------------------------
# DESCRIPTION:
#   Provides a set of targets to build a C, C++ and/or Assembly application
#   via the AVR-GCC compiler.
# -----------------------------------------------------------------------------
# TARGETS:
#
#    size                      - List built application size
#    symbol-sizes              - Print application symbols from the binary ELF
#                                file as a list sorted by size in bytes
#    all                       - Build application and list size
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#    lib                       - Build and archive source files into a library
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#    elf                       - Build application ELF debug object file
#    hex                       - Build application HEX object files
#    lss                       - Build application LSS assembly listing file
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#    clean                     - Remove all project intermediatary and binary
#                                output files
#    mostlyclean               - Remove intermediatary output files, but
#                                preserve binaries
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#    <filename>.s              - Compile C/C++ source file into an assembly file
#                                for manual code inspection
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#
# MANDATORY PARAMETERS:
#
#    TARGET                    - Application name
#    ARCH                      - Device architecture name
#    MCU                       - Microcontroller device model name
#    SRC                       - List of input source files (*.c, *.cpp, *.S)
#    F_USB                     - Speed of the input clock of the USB controller
#                                in Hz
#    LUFA_PATH                 - Path to the LUFA library core
#
# OPTIONAL PARAMETERS:
#
#    BOARD                     - LUFA board hardware
#    OPTIMIZATION              - Optimization level
#    C_STANDARD                - C Language Standard to use
#    CPP_STANDARD              - C++ Language Standard to use
#    F_CPU                     - Speed of the CPU, in Hz
#    C_FLAGS                   - Flags to pass to the C compiler only
#    CPP_FLAGS                 - Flags to pass to the C++ compiler only
#    ASM_FLAGS                 - Flags to pass to the assembler only
#    CC_FLAGS                  - Common flags to pass to the C/C++ compiler and
#                                assembler
#    LD_FLAGS                  - Flags to pass to the linker
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#    OBJDIR                    - Directory for the output object and dependency
#                                files; if equal to ".", the output files will
#                                be generated in the same folder as the sources
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#    OBJECT_FILES              - Extra object files to link in to the binaries
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#    DEBUG_FORMAT              - Format of the debugging information to
#                                generate in the compiled object files
#    DEBUG_LEVEL               - Level the debugging information to generate in
#                                the compiled object files
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#
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# PROVIDED VARIABLES:
#
#    (None)
#
# PROVIDED MACROS:
#
#    (None)
#
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# -----------------------------------------------------------------------------

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SHELL = /bin/sh

ERROR_IF_UNSET   ?= $(if $(filter undefined, $(origin $(strip $(1)))), $(error Makefile $(strip $(1)) value not set))
ERROR_IF_EMPTY   ?= $(if $(strip $($(strip $(1)))), , $(error Makefile $(strip $(1)) option cannot be blank))
ERROR_IF_NONBOOL ?= $(if $(filter Y N, $($(strip $(1)))), , $(error Makefile $(strip $(1)) option must be Y or N))
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# Default values of optionally user-supplied variables
BOARD           ?= NONE
OPTIMIZATION    ?= s
F_CPU           ?=
C_STANDARD      ?= gnu99
CPP_STANDARD    ?= gnu++98
C_FLAGS         ?=
CPP_FLAGS       ?=
ASM_FLAGS       ?=
CC_FLAGS        ?=
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OBJDIR          ?= .
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OBJECT_FILES    ?=
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DEBUG_FORMAT    ?= dwarf-2
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DEBUG_LEVEL     ?= 2
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# Sanity check user supplied values
$(foreach MANDATORY_VAR, $(LUFA_BUILD_MANDATORY_VARS), $(call ERROR_IF_UNSET, $(MANDATORY_VAR)))
$(call ERROR_IF_EMPTY, MCU)
$(call ERROR_IF_EMPTY, TARGET)
$(call ERROR_IF_EMPTY, ARCH)
$(call ERROR_IF_EMPTY, F_USB)
$(call ERROR_IF_EMPTY, LUFA_PATH)
$(call ERROR_IF_EMPTY, BOARD)
$(call ERROR_IF_EMPTY, OPTIMIZATION)
$(call ERROR_IF_EMPTY, C_STANDARD)
$(call ERROR_IF_EMPTY, CPP_STANDARD)
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$(call ERROR_IF_EMPTY, OBJDIR)
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$(call ERROR_IF_EMPTY, DEBUG_FORMAT)
$(call ERROR_IF_EMPTY, DEBUG_LEVEL)
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# Determine the utility prefix to use for the selected architecture
ifeq ($(ARCH), AVR8)
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   CROSS        := avr
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else ifeq ($(ARCH), XMEGA)
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   CROSS        := avr
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   $(warning The XMEGA device support is currently EXPERIMENTAL (incomplete and/or non-functional), and is included for preview purposes only.)
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else ifeq ($(ARCH), UC3)
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   CROSS        := avr32
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   $(warning The UC3 device support is currently EXPERIMENTAL (incomplete and/or non-functional), and is included for preview purposes only.)
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else
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   $(error Unsupported architecture "$(ARCH)")
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endif

# Output Messages
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MSG_INFO_MESSAGE := ' [INFO]    :'
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MSG_COMPILE_CMD  := ' [GCC]     :'
MSG_ASSEMBLE_CMD := ' [GAS]     :'
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MSG_NM_CMD       := ' [NM]      :'
MSG_REMOVE_CMD   := ' [RM]      :'
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MSG_LINK_CMD     := ' [LNK]     :'
MSG_ARCHIVE_CMD  := ' [AR]      :'
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MSG_SIZE_CMD     := ' [SIZE]    :'
MSG_OBJCPY_CMD   := ' [OBJCPY]  :'
MSG_OBJDMP_CMD   := ' [OBJDMP]  :'

# Convert input source file list to differentiate them by type
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C_SOURCE   := $(filter %.c, $(SRC))
CPP_SOURCE := $(filter %.cpp, $(SRC))
ASM_SOURCE := $(filter %.S, $(SRC))
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# Create a list of unknown source file types, if any are found throw an error
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UNKNOWN_SOURCE := $(filter-out $(C_SOURCE) $(CPP_SOURCE) $(ASM_SOURCE), $(SRC))
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ifneq ($(UNKNOWN_SOURCE),)
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   $(error Unknown input source file formats: $(UNKNOWN_SOURCE))
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endif

# Convert input source filenames into a list of required output object files
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OBJECT_FILES += $(addsuffix .o, $(basename $(SRC)))
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# Check if an output object file directory was specified instead of the input file location
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ifneq ($(OBJDIR),.)
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   # Prefix all the object filenames with the output object file directory path
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   OBJECT_FILES    := $(addprefix $(patsubst %/,%,$(OBJDIR))/, $(notdir $(OBJECT_FILES)))
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   # Check if any object file (without path) appears more than once in the object file list
   ifneq ($(words $(sort $(OBJECT_FILES))), $(words $(OBJECT_FILES)))
       $(error Cannot build with OBJDIR parameter set - one or more object file name is not unique)
   endif
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   # Create the output object file directory if it does not exist and add it to the virtual path list
   $(shell mkdir $(OBJDIR) 2> /dev/null)   
   VPATH           += $(dir $(SRC))
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endif

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# Create a list of dependency files from the list of object files
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DEPENDENCY_FILES := $(OBJECT_FILES:%.o=%.d)
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# Create a list of common flags to pass to the compiler/linker/assembler
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BASE_CC_FLAGS    := -pipe -g$(DEBUG_FORMAT) -g$(DEBUG_LEVEL)
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ifeq ($(ARCH), AVR8)
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   BASE_CC_FLAGS += -mmcu=$(MCU) -fshort-enums -fno-inline-small-functions -fpack-struct
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else ifeq ($(ARCH), XMEGA)
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   BASE_CC_FLAGS += -mmcu=$(MCU) -fshort-enums -fno-inline-small-functions -fpack-struct
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else ifeq ($(ARCH), UC3)
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   BASE_CC_FLAGS += -mpart=$(MCU:at32%=%) -masm-addr-pseudos
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endif
BASE_CC_FLAGS += -Wall -fno-strict-aliasing -funsigned-char -funsigned-bitfields -ffunction-sections
BASE_CC_FLAGS += -I. -I$(patsubst %/,%,$(LUFA_PATH))/..
BASE_CC_FLAGS += -DARCH=ARCH_$(ARCH) -DBOARD=BOARD_$(BOARD) -DF_USB=$(F_USB)UL
ifneq ($(F_CPU),)
   BASE_CC_FLAGS += -DF_CPU=$(F_CPU)UL
endif

# Additional language specific compiler flags
BASE_C_FLAGS   := -x c -O$(OPTIMIZATION) -std=$(C_STANDARD) -Wstrict-prototypes
BASE_CPP_FLAGS := -x c++ -O$(OPTIMIZATION) -std=$(CPP_STANDARD)
BASE_ASM_FLAGS := -x assembler-with-cpp

# Create a list of flags to pass to the linker
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BASE_LD_FLAGS := -lm -Wl,-Map=$(TARGET).map,--cref -Wl,--gc-sections -Wl,--relax 
ifeq ($(ARCH), AVR8)
   BASE_LD_FLAGS += -mmcu=$(MCU)
else ifeq ($(ARCH), XMEGA)
   BASE_LD_FLAGS += -mmcu=$(MCU)
else ifeq ($(ARCH), UC3)
   BASE_LD_FLAGS += -mpart=$(MCU:at32%=%) --rodata-writable --direct-data
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endif

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# Determine flags to pass to the size utility based on its reported features (only invoke if size target required)
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# and on an architecture where this non-standard patch is available
ifneq ($(ARCH), UC3)
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size: SIZE_MCU_FLAG    := $(shell $(CROSS)-size --help | grep -- --mcu > /dev/null && echo --mcu=$(MCU) )
size: SIZE_FORMAT_FLAG := $(shell $(CROSS)-size --help | grep -- --format=.*avr > /dev/null && echo --format=avr )
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endif
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# Pre-build informational target, to give compiler and project name information when building
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build_begin:
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	@echo $(MSG_INFO_MESSAGE) Begin compilation of project \"$(TARGET)\"...
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	@echo ""
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	@$(CROSS)-gcc --version
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# Post-build informational target, to project name information when building has completed
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build_end:
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	@echo $(MSG_INFO_MESSAGE) Finished building project \"$(TARGET)\".
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# Prints size information of a compiled application (FLASH, RAM and EEPROM usages)
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size: $(TARGET).elf
	@echo $(MSG_SIZE_CMD) Determining size of \"$<\"
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	@echo ""
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	$(CROSS)-size $(SIZE_MCU_FLAG) $(SIZE_FORMAT_FLAG) $<
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# Prints size information on the symbols within a compiled application in decimal bytes
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symbol-sizes: $(TARGET).elf
	@echo $(MSG_NM_CMD) Extracting \"$<\" symbols with decimal byte sizes
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	$(CROSS)-nm --size-sort --demangle --radix=d $<
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# Cleans intermediatary build files, leaving only the compiled application files
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mostlyclean:
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	@echo $(MSG_REMOVE_CMD) Removing object files of \"$(TARGET)\"
	rm -f $(OBJECT_FILES)
	@echo $(MSG_REMOVE_CMD) Removing dependency files of \"$(TARGET)\"
	rm -f $(DEPENDENCY_FILES)
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# Cleans all build files, leaving only the original source code
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clean: mostlyclean
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	@echo $(MSG_REMOVE_CMD) Removing output files of \"$(TARGET)\"
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	rm -f $(TARGET).elf $(TARGET).hex $(TARGET).eep $(TARGET).map $(TARGET).lss $(TARGET).sym $(TARGET).a
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# Performs a complete build of the user application and prints size information afterwards
all: build_begin elf hex lss sym size build_end
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# Helper targets, to build a specific type of output file without having to know the project target name
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lib: lib$(TARGET).a
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elf: $(TARGET).elf
hex: $(TARGET).hex $(TARGET).eep
lss: $(TARGET).lss
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sym: $(TARGET).sym
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# Default target to *create* the user application's specified source files; if this rule is executed by
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# make, the input source file doesn't exist and an error needs to be presented to the user
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$(SRC):
	$(error Source file does not exist: $@)

# Compiles an input C source file and generates an assembly listing for it
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%.s: %.c $(MAKEFILE_LIST)
	@echo $(MSG_COMPILE_CMD) Generating assembly from C file \"$(notdir $<)\"
	$(CROSS)-gcc -S $(BASE_CC_FLAGS) $(BASE_C_FLAGS) $(CC_FLAGS) $(C_FLAGS) $< -o $@

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# Compiles an input C++ source file and generates an assembly listing for it
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%.s: %.cpp $(MAKEFILE_LIST)
	@echo $(MSG_COMPILE_CMD) Generating assembly from C++ file \"$(notdir $<)\"
	$(CROSS)-gcc -S $(BASE_CC_FLAGS) $(BASE_CPP_FLAGS) $(CC_FLAGS) $(CPP_FLAGS) $< -o $@

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# Compiles an input C source file and generates a linkable object file for it
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$(OBJDIR)/%.o: %.c $(MAKEFILE_LIST)
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	@echo $(MSG_COMPILE_CMD) Compiling C file \"$(notdir $<)\"
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	$(CROSS)-gcc -c $(BASE_CC_FLAGS) $(BASE_C_FLAGS) $(CC_FLAGS) $(C_FLAGS) -MMD -MP -MF $(@:%.o=%.d) $< -o $@
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# Compiles an input C++ source file and generates a linkable object file for it
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$(OBJDIR)/%.o: %.cpp $(MAKEFILE_LIST)
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	@echo $(MSG_COMPILE_CMD) Compiling C++ file \"$(notdir $<)\"
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	$(CROSS)-gcc -c $(BASE_CC_FLAGS) $(BASE_CPP_FLAGS) $(CC_FLAGS) $(CPP_FLAGS) -MMD -MP -MF $(@:%.o=%.d) $< -o $@
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# Assembles an input ASM source file and generates a linkable object file for it
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$(OBJDIR)/%.o: %.S $(MAKEFILE_LIST)
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	@echo $(MSG_ASSEMBLE_CMD) Assembling \"$(notdir $<)\"
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	$(CROSS)-gcc -c $(BASE_CC_FLAGS) $(BASE_ASM_FLAGS) $(CC_FLAGS) $(ASM_FLAGS) -MMD -MP -MF $(@:%.o=%.d) $< -o $@
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# Generates a library archive file from the user application, which can be linked into other applications
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.PRECIOUS  : $(OBJECT_FILES)
.SECONDARY : %.a
%.a: $(OBJECT_FILES)
	@echo $(MSG_ARCHIVE_CMD) Archiving object files into \"$@\"
	$(CROSS)-ar rcs $@ $(OBJECT_FILES)

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# Generates an ELF debug file from the user application, which can be further processed for FLASH and EEPROM data
# files, or used for programming and debugging directly
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.PRECIOUS  : $(OBJECT_FILES)
.SECONDARY : %.elf
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%.elf: $(OBJECT_FILES)
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	@echo $(MSG_LINK_CMD) Linking object files into \"$@\"
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	$(CROSS)-gcc $(BASE_LD_FLAGS) $(LD_FLAGS) $^ -o $@
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# Extracts out the loadable FLASH memory data from the project ELF file, and creates an Intel HEX format file of it
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%.hex: %.elf
	@echo $(MSG_OBJCPY_CMD) Extracting HEX file data from \"$<\"
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	$(CROSS)-objcopy -O ihex -R .eeprom -R .fuse -R .lock -R .signature $< $@
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# Extracts out the loadable EEPROM memory data from the project ELF file, and creates an Intel HEX format file of it
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%.eep: %.elf
	@echo $(MSG_OBJCPY_CMD) Extracting EEP file data from \"$<\"
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	$(CROSS)-objcopy -j .eeprom --set-section-flags=.eeprom="alloc,load" --change-section-lma .eeprom=0 --no-change-warnings -O ihex $< $@ || exit 0
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# Creates an assembly listing file from an input project ELF file, containing interleaved assembly and source data
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%.lss: %.elf
	@echo $(MSG_OBJDMP_CMD) Extracting LSS file data from \"$<\"
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	$(CROSS)-objdump -h -d -S -z $< > $@
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# Creates a symbol file listing the loadable and discarded symbols from an input project ELF file
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%.sym: %.elf
	@echo $(MSG_NM_CMD) Extracting SYM file data from \"$<\"
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	$(CROSS)-nm -n $< > $@
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# Include build dependency files
-include $(DEPENDENCY_FILES)

# Phony build targets for this module
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.PHONY: build_begin build_end size symbol-sizes lib elf hex lss clean mostlyclean