#
# LUFA Library
-# Copyright (C) Dean Camera, 2012.
+# Copyright (C) Dean Camera, 2015.
#
# dean [at] fourwalledcubicle [dot] com
# www.lufa-lib.org
#
LUFA_BUILD_MODULES += BUILD
-LUFA_BUILD_TARGETS += size check-source symbol-sizes all lib elf hex lss clean mostlyclean
+LUFA_BUILD_TARGETS += size symbol-sizes all lib elf bin hex lss clean mostlyclean
LUFA_BUILD_MANDATORY_VARS += TARGET ARCH MCU SRC F_USB LUFA_PATH
-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
-LUFA_BUILD_PROVIDED_VARS +=
-LUFA_BUILD_PROVIDED_MACROS +=
+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 LINKER_RELAXATIONS COMPILER_PATH
+LUFA_BUILD_PROVIDED_VARS +=
+LUFA_BUILD_PROVIDED_MACROS +=
# -----------------------------------------------------------------------------
# LUFA GCC Compiler Buildsystem Makefile Module.
# size - List built application size
# symbol-sizes - Print application symbols from the binary ELF
# file as a list sorted by size in bytes
-# check-source - Print a list of SRC source files that cannot
-# be found
# all - Build application and list size
# lib - Build and archive source files into a library
# elf - Build application ELF debug object file
-# hex - Build application HEX object files
+# bin - Build application BIN binary object file
+# hex - Build application HEX object file
# lss - Build application LSS assembly listing file
-# clean - Remove all project intermediatary and binary
+# clean - Remove all project intermediary and binary
# output files
-# mostlyclean - Remove intermediatary output files, but
+# mostlyclean - Remove intermediary output files, but
# preserve binaries
+# <filename>.s - Compile C/C++ source file into an assembly file
+# for manual code inspection
#
# MANDATORY PARAMETERS:
#
# CC_FLAGS - Common flags to pass to the C/C++ compiler and
# assembler
# LD_FLAGS - Flags to pass to the linker
+# LINKER_RELAXATIONS - Enable or disable linker relaxations to
+# decrease binary size (note: can cause link
+# failures on systems with an unpatched binutils)
# 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
# generate in the compiled object files
# DEBUG_LEVEL - Level the debugging information to generate in
# the compiled object files
+# COMPILER_PATH - Location of the GCC toolchain to use
#
# PROVIDED VARIABLES:
#
ERROR_IF_NONBOOL ?= $(if $(filter Y N, $($(strip $(1)))), , $(error Makefile $(strip $(1)) option must be Y or N))
# 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 ?=
-OBJDIR ?= .
-OBJECT_FILES ?=
-DEBUG_FORMAT ?= dwarf-2
-DEBUG_LEVEL ?= 2
+COMPILER_PATH ?=
+BOARD ?= NONE
+OPTIMIZATION ?= s
+F_CPU ?=
+C_STANDARD ?= gnu99
+CPP_STANDARD ?= gnu++98
+C_FLAGS ?=
+CPP_FLAGS ?=
+ASM_FLAGS ?=
+CC_FLAGS ?=
+OBJDIR ?= .
+OBJECT_FILES ?=
+DEBUG_FORMAT ?= dwarf-2
+DEBUG_LEVEL ?= 2
+LINKER_RELAXATIONS ?= Y
# Sanity check user supplied values
$(foreach MANDATORY_VAR, $(LUFA_BUILD_MANDATORY_VARS), $(call ERROR_IF_UNSET, $(MANDATORY_VAR)))
$(call ERROR_IF_EMPTY, OBJDIR)
$(call ERROR_IF_EMPTY, DEBUG_FORMAT)
$(call ERROR_IF_EMPTY, DEBUG_LEVEL)
+$(call ERROR_IF_NONBOOL, LINKER_RELAXATIONS)
# Determine the utility prefix to use for the selected architecture
ifeq ($(ARCH), AVR8)
- CROSS := avr
+ CROSS := $(COMPILER_PATH)avr
else ifeq ($(ARCH), XMEGA)
- CROSS := avr
+ CROSS := $(COMPILER_PATH)avr
$(warning The XMEGA device support is currently EXPERIMENTAL (incomplete and/or non-functional), and is included for preview purposes only.)
else ifeq ($(ARCH), UC3)
- CROSS := avr32
+ CROSS := $(COMPILER_PATH)avr32
$(warning The UC3 device support is currently EXPERIMENTAL (incomplete and/or non-functional), and is included for preview purposes only.)
else
$(error Unsupported architecture "$(ARCH)")
ifneq ($(OBJDIR),.)
# Prefix all the object filenames with the output object file directory path
OBJECT_FILES := $(addprefix $(patsubst %/,%,$(OBJDIR))/, $(notdir $(OBJECT_FILES)))
-
+
# Check if any object file (without path) appears more than once in the object file list
ifneq ($(words $(sort $(OBJECT_FILES))), $(words $(OBJECT_FILES)))
$(error Cannot build with OBJDIR parameter set - one or more object file name is not unique)
endif
# 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)
+ $(shell mkdir $(OBJDIR) 2> /dev/null)
VPATH += $(dir $(SRC))
endif
ifneq ($(F_CPU),)
BASE_CC_FLAGS += -DF_CPU=$(F_CPU)UL
endif
+ifeq ($(LINKER_RELAXATIONS), Y)
+BASE_CC_FLAGS += -mrelax
+endif
+
+# This flag is required for bootloaders as GCC will emit invalid jump table
+# assembly code for devices with large amounts of flash; the jump table target
+# is extracted from FLASH without using the correct ELPM instruction, resulting
+# in a pseudo-random jump target.
+BASE_CC_FLAGS += -fno-jump-tables
# Additional language specific compiler flags
BASE_C_FLAGS := -x c -O$(OPTIMIZATION) -std=$(C_STANDARD) -Wstrict-prototypes
BASE_ASM_FLAGS := -x assembler-with-cpp
# Create a list of flags to pass to the linker
-BASE_LD_FLAGS := -lm -Wl,-Map=$(TARGET).map,--cref -Wl,--gc-sections -Wl,--relax
+BASE_LD_FLAGS := -lm -Wl,-Map=$(TARGET).map,--cref -Wl,--gc-sections
+ifeq ($(LINKER_RELAXATIONS), Y)
+ BASE_LD_FLAGS += -Wl,--relax
+endif
ifeq ($(ARCH), AVR8)
BASE_LD_FLAGS += -mmcu=$(MCU)
else ifeq ($(ARCH), XMEGA)
endif
# Determine flags to pass to the size utility based on its reported features (only invoke if size target required)
+# and on an architecture where this non-standard patch is available
+ifneq ($(ARCH), UC3)
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 )
+endif
+# Pre-build informational target, to give compiler and project name information when building
build_begin:
@echo $(MSG_INFO_MESSAGE) Begin compilation of project \"$(TARGET)\"...
@echo ""
@$(CROSS)-gcc --version
-
+
+# Post-build informational target, to project name information when building has completed
build_end:
@echo $(MSG_INFO_MESSAGE) Finished building project \"$(TARGET)\".
-check-source:
- @for f in $(SRC); do \
- if [ ! -f $$f ]; then \
- echo "Error: Source file not found: $$f"; \
- exit 1; \
- fi; \
- done
-
+# Prints size information of a compiled application (FLASH, RAM and EEPROM usages)
size: $(TARGET).elf
@echo $(MSG_SIZE_CMD) Determining size of \"$<\"
@echo ""
- $(CROSS)-size $(SIZE_MCU_FLAG) $(SIZE_FORMAT_FLAG) $< ; 2>/dev/null;
+ $(CROSS)-size $(SIZE_MCU_FLAG) $(SIZE_FORMAT_FLAG) $<
+# Prints size information on the symbols within a compiled application in decimal bytes
symbol-sizes: $(TARGET).elf
@echo $(MSG_NM_CMD) Extracting \"$<\" symbols with decimal byte sizes
$(CROSS)-nm --size-sort --demangle --radix=d $<
+# Cleans intermediary build files, leaving only the compiled application files
mostlyclean:
@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)
+# Cleans all build files, leaving only the original source code
clean: mostlyclean
@echo $(MSG_REMOVE_CMD) Removing output files of \"$(TARGET)\"
- rm -f $(TARGET).elf $(TARGET).hex $(TARGET).eep $(TARGET).map $(TARGET).lss $(TARGET).sym $(TARGET).a
+ rm -f $(TARGET).elf $(TARGET).hex $(TARGET).bin $(TARGET).eep $(TARGET).map $(TARGET).lss $(TARGET).sym lib$(TARGET).a
-all: build_begin check-source elf hex lss sym size build_end
+# Performs a complete build of the user application and prints size information afterwards
+all: build_begin elf hex bin lss sym size build_end
+# Helper targets, to build a specific type of output file without having to know the project target name
lib: lib$(TARGET).a
elf: $(TARGET).elf
hex: $(TARGET).hex $(TARGET).eep
+bin: $(TARGET).bin
lss: $(TARGET).lss
sym: $(TARGET).sym
+# Default target to *create* the user application's specified source files; if this rule is executed by
+# make, the input source file doesn't exist and an error needs to be presented to the user
+$(SRC):
+ $(error Source file does not exist: $@)
+
+# Compiles an input C source file and generates an assembly listing for it
%.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 $@
+# Compiles an input C++ source file and generates an assembly listing for it
%.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 $@
+# Compiles an input C source file and generates a linkable object file for it
$(OBJDIR)/%.o: %.c $(MAKEFILE_LIST)
@echo $(MSG_COMPILE_CMD) Compiling C file \"$(notdir $<)\"
$(CROSS)-gcc -c $(BASE_CC_FLAGS) $(BASE_C_FLAGS) $(CC_FLAGS) $(C_FLAGS) -MMD -MP -MF $(@:%.o=%.d) $< -o $@
+# Compiles an input C++ source file and generates a linkable object file for it
$(OBJDIR)/%.o: %.cpp $(MAKEFILE_LIST)
@echo $(MSG_COMPILE_CMD) Compiling C++ file \"$(notdir $<)\"
$(CROSS)-gcc -c $(BASE_CC_FLAGS) $(BASE_CPP_FLAGS) $(CC_FLAGS) $(CPP_FLAGS) -MMD -MP -MF $(@:%.o=%.d) $< -o $@
-
+
+# Assembles an input ASM source file and generates a linkable object file for it
$(OBJDIR)/%.o: %.S $(MAKEFILE_LIST)
@echo $(MSG_ASSEMBLE_CMD) Assembling \"$(notdir $<)\"
$(CROSS)-gcc -c $(BASE_CC_FLAGS) $(BASE_ASM_FLAGS) $(CC_FLAGS) $(ASM_FLAGS) -MMD -MP -MF $(@:%.o=%.d) $< -o $@
+# Generates a library archive file from the user application, which can be linked into other applications
.PRECIOUS : $(OBJECT_FILES)
.SECONDARY : %.a
%.a: $(OBJECT_FILES)
@echo $(MSG_ARCHIVE_CMD) Archiving object files into \"$@\"
$(CROSS)-ar rcs $@ $(OBJECT_FILES)
+# 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
.PRECIOUS : $(OBJECT_FILES)
.SECONDARY : %.elf
%.elf: $(OBJECT_FILES)
@echo $(MSG_LINK_CMD) Linking object files into \"$@\"
- $(CROSS)-gcc $(BASE_LD_FLAGS) $(LD_FLAGS) $^ -o $@
+ $(CROSS)-gcc $^ -o $@ $(BASE_LD_FLAGS) $(LD_FLAGS)
+# Extracts out the loadable FLASH memory data from the project ELF file, and creates an Intel HEX format file of it
%.hex: %.elf
@echo $(MSG_OBJCPY_CMD) Extracting HEX file data from \"$<\"
$(CROSS)-objcopy -O ihex -R .eeprom -R .fuse -R .lock -R .signature $< $@
+# Extracts out the loadable FLASH memory data from the project ELF file, and creates an Binary format file of it
+%.bin: %.elf
+ @echo $(MSG_OBJCPY_CMD) Extracting BIN file data from \"$<\"
+ $(CROSS)-objcopy -O binary -R .eeprom -R .fuse -R .lock -R .signature $< $@
+
+# Extracts out the loadable EEPROM memory data from the project ELF file, and creates an Intel HEX format file of it
%.eep: %.elf
@echo $(MSG_OBJCPY_CMD) Extracting EEP file data from \"$<\"
- $(CROSS)-objcopy -j .eeprom --set-section-flags=.eeprom="alloc,load" --change-section-lma .eeprom=0 --no-change-warnings -O ihex $< $@ || exit 0
+ $(CROSS)-objcopy -O ihex -j .eeprom --set-section-flags=.eeprom="alloc,load" --change-section-lma .eeprom=0 --no-change-warnings $< $@ || exit 0
+# Creates an assembly listing file from an input project ELF file, containing interleaved assembly and source data
%.lss: %.elf
@echo $(MSG_OBJDMP_CMD) Extracting LSS file data from \"$<\"
- $(CROSS)-objdump -h -S -z $< > $@
+ $(CROSS)-objdump -h -d -S -z $< > $@
+# Creates a symbol file listing the loadable and discarded symbols from an input project ELF file
%.sym: %.elf
@echo $(MSG_NM_CMD) Extracting SYM file data from \"$<\"
$(CROSS)-nm -n $< > $@
-include $(DEPENDENCY_FILES)
# Phony build targets for this module
-.PHONY: build_begin build_end check-source size symbol-sizes lib elf hex lss clean mostlyclean
+.PHONY: build_begin build_end size symbol-sizes lib elf hex lss clean mostlyclean
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