[BUILD] Add build system module makefiles, add README how to use it.
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Frantisek Burian
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-------------------------------------------------------------------------------
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README
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-------------------------------------------------------------------------------
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This directory contains makefile modular support files, that can be used in
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your project.
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Each module is packaged with two inclusion makefiles, <module>-config.mk and
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<module>-rules.mk. The first one defines some new variables for the make, or
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appends values to the existing variables for the make. The second defines rules
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for support building.
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So in your project, the <module>-config.mk should be included at some place,
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where you are defining variables (near the beginning of the file), and file
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<module>-rules.mk should be included in the rules part of makefile (somewhere
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near to the end of file).
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Example makefile using gcc compiler module:
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>>>>>>
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OBJS += foo.o bar.o
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CFLAGS += -O0 -g
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CPPFLAGS += -MD -MP $(@F).d
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CPPFLAGS += $(DEFS)
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CPPFLAGS += $(INCS)
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LDFLAGS += --static --nostartfiles
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LDLIBS += -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
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# parameters for gcc module
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PREFIX = arm-elf
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include $(OPENCM3_DIR)/mk/gcc-config.mk
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.PHONY: clean all
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all: binary.images
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%.images: %.elf %.hex
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include $(OPENCM3_DIR)/mk/gcc-rules.mk
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clean:
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$(Q)$(RM) -rf binary.* *.o *.d
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-include $(OBJS:.o=.d)
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<<<<<<
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MODULES
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=======
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-------------------------------------------------------------------------------
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gcc
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-------------------------------------------------------------------------------
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This module adds an extended support for GCC toolchain. This adds rules,
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neccessary for compiling C and C++ files into elf binary, and rules for
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generation of bin, hex, or srec output files for flashing.
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Variables to control the build process (should be set in your makefile):
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------------------------------------------------------------------------
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CFLAGS C compiler flags
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CXXFLAGS C++ compiler flags
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CPPFLAGS C preprocessor flags (used for C and for C++ compiler)
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LDFLAGS Linker flags
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ARCH_FLAGS Architecture specification flags (-mcpu, -march etc )
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Variables to tell gcc about project dependencies and input files
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----------------------------------------------------------------
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LDSCRIPT Linker script file name (can be generated or fixed)
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LIBDEPS Array of library filenames that shoud be rebuilt if needed
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LDLIBS Array of libraries to be linked with (array of -l<libname>)
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OBJS Array of object files to be built
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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2014 Frantisek Burian <BuFran@seznam.cz>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This library is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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###############################################################################
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# The support makefile for GCC compiler toolchain, the rules part.
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#
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# please read mk/README for specification how to use this file in your project
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PREFIX ?= arm-none-eabi
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#PREFIX ?= arm-elf
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CC := $(PREFIX)-gcc
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CXX := $(PREFIX)-g++
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LD := $(PREFIX)-gcc
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AR := $(PREFIX)-ar
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AS := $(PREFIX)-as
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OBJCOPY := $(PREFIX)-objcopy
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OBJDUMP := $(PREFIX)-objdump
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GDB := $(PREFIX)-gdb
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SIZE := $(PREFIX)-size
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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2014 Frantisek Burian <BuFran@seznam.cz>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This library is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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###############################################################################
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# The support makefile for GCC compiler toolchain, the rules part.
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#
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# please read mk/README for specification how to use this file in your project
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#
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%.bin: %.elf
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@printf " OBJCOPY $@\n"
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$(Q)$(OBJCOPY) -Obinary $< $@
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%.hex: %.elf
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@printf " OBJCOPY $@\n"
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$(Q)$(OBJCOPY) -Oihex $< $@
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%.srec: %.elf
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@printf " OBJCOPY $@\n"
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$(Q)$(OBJCOPY) -Osrec $< $@
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%.list: %.elf
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@printf " OBJDUMP $@\n"
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$(Q)$(OBJDUMP) -S $< > $@
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%.elf: $(OBJS) $(LDSCRIPT) $(LIBDEPS)
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@printf " LD $(*).elf\n"
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$(Q)$(LD) $(OBJS) $(LDLIBS) $(LDFLAGS) -T$(LDSCRIPT) $(ARCH_FLAGS) -o $@
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%.o: %.c
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@printf " CC $<\n"
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$(Q)$(CC) $(CFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) -o $@ -c $<
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%.o: %.cxx
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@printf " CXX $<\n"
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$(Q)$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) -o $@ -c $<
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%.o: %.cpp
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@printf " CXX $(*).cpp\n"
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$(Q)$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) -o $@ -c $<
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