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122 lines
4.0 KiB
122 lines
4.0 KiB
4 months ago
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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 the gcc compiler module together with the linker script
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generator module:
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>>>>>>
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DEVICE =
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OPENCM3_DIR =
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OBJS += foo.o
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CFLAGS += -Os -ggdb3
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CPPFLAGS += -MD
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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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include $(OPENCM3_DIR)/mk/genlink-config.mk
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include $(OPENCM3_DIR)/mk/gcc-config.mk
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.PHONY: clean all
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all: binary.elf binary.hex
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clean:
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$(Q)$(RM) -rf binary.* *.o
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include $(OPENCM3_DIR)/mk/genlink-rules.mk
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include $(OPENCM3_DIR)/mk/gcc-rules.mk
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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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necessary 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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genlink
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-------------------------------------------------------------------------------
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This module adds an support for the user to the linker script generator. The
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linker script will be generated as the file $(DEVICE).ld in the project folder,
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and automatically be used for the linking process.
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Additionally the matching library is added to the LDLIBS variable.
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Variables to control the build process (should be set in your makefile):
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------------------------------------------------------------------------
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DEVICE The full device part name used for the compilation process.
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OPENCM3_DIR The root path of libopencm3 library.
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Output variables from this module:
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----------------------------------
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CPPFLAGS (appended)
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- Appends the chip family to the CPPFLAGS. For example -DSTM32F1
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- Appends the include path for libopencm3
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ARCH_FLAGS (replaced)
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- Architecture build flags for specified chip.
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* No needed to handle this variable if you use module <gcc> too.
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LDSCRIPT (replaced)
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- Linker script generated file.
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* No needed to handle this variable if you use module <gcc> too.
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LDLIBS (appended)
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- LDLIBS += -lopencm3_$(family) is appended to link against the
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matching library.
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LDFLAGS (appended)
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- LDFLAGS += -L$(OPENCM3_DIR)/lib is appended to make sure the
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matching library can be found.
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family,cpu,fpu (replaced)
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- these are used internally to create the above variables
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Temporary variables that you should not use in your makefile:
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-------------------------------------------------------------
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GENLINK_DEFS
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GENLINK_ARCH
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GENLINK_LIB
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