250 lines
10 KiB
Makefile
250 lines
10 KiB
Makefile
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#-------------------------------------------------------------------------------
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# Copyright (c) 2012 Freescale Semiconductor, Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification,
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# are permitted provided that the following conditions are met:
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#
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# o Redistributions of source code must retain the above copyright notice, this list
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# of conditions and the following disclaimer.
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#
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# o Redistributions in binary form must reproduce the above copyright notice, this
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# list of conditions and the following disclaimer in the documentation and/or
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# other materials provided with the distribution.
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#
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# o Neither the name of Freescale Semiconductor, Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from this
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# software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#-------------------------------------------------------------------------------
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#-------------------------------------------------------------------------------
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# Sources and objects
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#-------------------------------------------------------------------------------
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# Select our object root depending on whether we're building an app or lib.
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ifneq "$(APP_NAME)" ""
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OBJS_ROOT = $(APP_OBJS_ROOT)
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else
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OBJS_ROOT = $(LIB_OBJS_ROOT)
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endif
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# Strip sources.
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SOURCES := $(strip $(SOURCES))
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# Convert sources list to absolute paths and root-relative paths.
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SOURCES_ABS := $(foreach s,$(SOURCES),$(abspath $(s)))
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SOURCES_REL := $(subst $(SDK_ROOT)/,,$(SOURCES_ABS))
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# Get a list of unique directories containing the source files.
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SOURCE_DIRS_ABS := $(sort $(foreach f,$(SOURCES_ABS),$(dir $(f))))
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SOURCE_DIRS_REL := $(subst $(SDK_ROOT)/,,$(SOURCE_DIRS_ABS))
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OBJECTS_DIRS := $(addprefix $(OBJS_ROOT)/,$(SOURCE_DIRS_REL))
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# Filter source files list into separate source types.
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C_SOURCES = $(filter %.c,$(SOURCES_REL))
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CXX_SOURCES = $(filter %.cpp,$(SOURCES_REL))
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ASM_s_SOURCES = $(filter %.s,$(SOURCES_REL))
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ASM_S_SOURCES = $(filter %.S,$(SOURCES_REL))
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# Convert sources to objects.
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OBJECTS_C := $(addprefix $(OBJS_ROOT)/,$(C_SOURCES:.c=.o))
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OBJECTS_CXX := $(addprefix $(OBJS_ROOT)/,$(CXX_SOURCES:.cpp=.o))
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OBJECTS_ASM := $(addprefix $(OBJS_ROOT)/,$(ASM_s_SOURCES:.s=.o))
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OBJECTS_ASM_S := $(addprefix $(OBJS_ROOT)/,$(ASM_S_SOURCES:.S=.o))
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PREBUILT_OBJECTS = $(addprefix $(SDK_ROOT)/,$(filter %.o,$(SOURCES_REL)))
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# Complete list of all object files.
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OBJECTS_ALL := $(sort $(OBJECTS_C) $(OBJECTS_CXX) $(OBJECTS_ASM) $(OBJECTS_ASM_S) $(PREBUILT_OBJECTS))
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#-------------------------------------------------------------------------------
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# Target library
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#-------------------------------------------------------------------------------
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# Library where app objects are archived, if used.
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LIBAPP = $(APP_OUTPUT_ROOT)/lib$(APP_NAME).a
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# Build the target lib path from the lib name.
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ifneq "$(TARGET_LIB_NAME)" ""
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TARGET_LIB ?= $(LIBS_ROOT)/lib$(TARGET_LIB_NAME).a
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else ifeq "$(ARCHIVE_APP_OBJECTS)" "1"
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TARGET_LIB ?= $(LIBAPP)
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endif
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# Construct full path name to application output ELF file.
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ifneq "$(APP_NAME)" ""
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APP_ELF ?= $(APP_OUTPUT_ROOT)/$(APP_NAME).elf
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endif
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# Select the output target.
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ifneq "$(TARGET_LIB)" ""
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# Only use the target lib if there are actually objects to put into it.
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ifneq "$(strip $(OBJECTS_ALL))" ""
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archive_or_objs = $(TARGET_LIB)($(OBJECTS_ALL))
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endif
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else
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archive_or_objs = $(OBJECTS_ALL)
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endif
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#-------------------------------------------------------------------------------
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# Default target
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#-------------------------------------------------------------------------------
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# Note that prerequisite order is important here. The subdirectories must be built first, or you
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# may end up with files in the current directory not getting added to libraries. This would happen
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# if subdirs modified the library file after local files were compiled but before they were added
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# to the library.
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.PHONY: all
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all : $(SUBDIRS) $(archive_or_objs) $(APP_ELF)
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# Recipe to create the output object file directories.
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$(OBJECTS_DIRS) :
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$(at)mkdir -p $@
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# Everything depends upon the current makefile.
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$(OBJECTS_ALL) $(APP_ELF): $(this_makefile)
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# Object files depend on the directories where they will be created.
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#
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# The dirs are made order-only prerequisites (by being listed after the '|') so they won't cause
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# the objects to be rebuilt, as the modification date on a directory changes whenver its contents
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# change. This would cause the objects to always be rebuilt if the dirs were normal prerequisites.
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$(OBJECTS_ALL): | $(OBJECTS_DIRS)
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#-------------------------------------------------------------------------------
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# Pattern rules for compilation
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#-------------------------------------------------------------------------------
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# We cd into the source directory before calling the appropriate compiler. This must be done
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# on a single command line since make calls individual recipe lines in separate shells, so
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# '&&' is used to chain the commands.
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#
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# Generate make dependencies while compiling using the -MMD option, which excludes system headers.
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# If system headers are included, there are path problems on cygwin. The -MP option creates empty
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# targets for each header file so that a rebuild will be forced if the file goes missing, but
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# no error will occur.
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# Compile C sources.
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$(OBJS_ROOT)/%.o: $(SDK_ROOT)/%.c
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@$(call printmessage,c,Compiling, $(subst $(SDK_ROOT)/,,$<))
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$(at)cd $(dir $<) && $(CC) $(CFLAGS) $(SYSTEM_INC) $(INCLUDES) $(DEFINES) -MMD -MF $(basename $@).d -MP -o $@ -c $<
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# Compile C++ sources.
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$(OBJS_ROOT)/%.o: $(SDK_ROOT)/%.cpp
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@$(call printmessage,cxx,Compiling, $(subst $(SDK_ROOT)/,,$<))
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$(at)cd $(dir $<) && $(CXX) $(CXXFLAGS) $(SYSTEM_INC) $(INCLUDES) $(DEFINES) -MMD -MF $(basename $@).d -MP -o $@ -c $<
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# For .S assembly files, first run through the C preprocessor then assemble.
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$(OBJS_ROOT)/%.o: $(SDK_ROOT)/%.S
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@$(call printmessage,asm,Assembling, $(subst $(SDK_ROOT)/,,$<))
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$(at)cd $(dir $<) \
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&& $(CPP) -D__LANGUAGE_ASM__ $(INCLUDES) $(DEFINES) -o $(basename $@).s $< \
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&& $(AS) $(ASFLAGS) $(INCLUDES) -MD $(OBJS_ROOT)/$*.d -o $@ $(basename $@).s
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# Assembler sources.
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$(OBJS_ROOT)/%.o: $(SDK_ROOT)/%.s
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@$(call printmessage,asm,Assembling, $(subst $(SDK_ROOT)/,,$<))
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$(at)cd $(dir $<) && $(AS) $(ASFLAGS) $(INCLUDES) -MD $(basename $@).d -o $@ $<
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# Add objects to the target library.
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#
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# We use mkdir to explicitly ensure that the archive's directory exists before calling
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# the ar tool. The dir can't be made a dependancy because make will try to add it to the
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# archive.
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#
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# flock is used to protect the archive file from multiple processes trying to write to it
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# simultaneously, in case we're using parallel processes.
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#
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# The log message is disabled in order to reduce clutter in the build log, since you will get
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# one message for every file that is archived.
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$(TARGET_LIB)(%): %
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# @$(call printmessage,ar,Archiving, $(?F) in $(@F))
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$(at)mkdir -p $(dir $(@))
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$(at)flock $(@).lock $(AR) -rucs $@ $?
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#-------------------------------------------------------------------------------
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# Subdirs
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#-------------------------------------------------------------------------------
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# Recursively execute make in each of the subdirectories.
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# Subdirs are double-colon rules to allow additional recipes to be added to them.
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# This is used by the top-level makefile to print a message when starting to build
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# the sdk library.
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.PHONY: $(SUBDIRS)
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$(SUBDIRS)::
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@$(MAKE) $(silent_make) -r -C $@
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#-------------------------------------------------------------------------------
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# Linking
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#-------------------------------------------------------------------------------
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# Only link the application if LINK_APP is defined.
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ifeq "$(LINK_APP)" "1"
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# If app objects are being archived into a library, we don't need to specify the
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# actual .o files on the linker command line.
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ifeq "$(ARCHIVE_APP_OBJECTS)" "1"
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app_objs = $(TARGET_LIB)
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else
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app_objs = $(OBJECTS_ALL) $(TARGET_LIB)
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endif
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app_bin = $(basename $(APP_ELF)).bin
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app_map = $(basename $(APP_ELF)).map
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# Preprocess the linker script if it has an ".S" extension.
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ifeq "$(filter %.S,$(LD_FILE))" ""
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the_ld_file = $(LD_FILE)
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else
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rel_ld_file = $(basename $(subst $(SDK_ROOT)/,,$(abspath $(LD_FILE))))
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the_ld_file = $(addprefix $(OBJS_ROOT)/,$(rel_ld_file))
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the_ld_file_dir = $(dir $(the_ld_file))
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# Rule to preprocess the ld file. The ld file's parent directory is made an order-only
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# prerequisite so it cannot by itself cause this recipe to be invoked.
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$(the_ld_file): $(LD_FILE) | $(the_ld_file_dir)
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@$(call printmessage,cpp,Preprocessing, $(subst $(SDK_ROOT)/,,$<))
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$(at)cd $(dir $<) && $(CC) -E -P $(INCLUDES) $(DEFINES) -o $@ $<
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endif
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# Link the application.
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# Wrap the link objects in start/end group so that ld re-checks each
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# file for dependencies. Otherwise linking static libs can be a pain
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# since order matters.
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$(APP_ELF): $(SUBDIRS) $(app_objs) $(the_ld_file) $(LIBRARIES) $(APP_LIBS)
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@$(call printmessage,link,Linking, $(APP_NAME))
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$(at)$(LD) -Bstatic -nostartfiles -nostdlib $(LDFLAGS) \
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-T $(the_ld_file) \
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$(LDINC) \
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--start-group \
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$(app_objs) \
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$(LIBRARIES) \
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$(APP_LIBS) \
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$(LDADD) \
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--end-group \
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-o $@ \
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-Map $(app_map) --cref
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$(at)$(OBJCOPY) --gap-fill 0x00 -I elf32-little -O binary $@ $(app_bin)
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@echo "Output ELF:" ; echo " $(APP_ELF)"
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@echo "Output binary:" ; echo " $(app_bin)"
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else
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# Empty target to prevent an error. Needed because $(APP_ELF) is a prereq for the 'all' target.
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$(APP_ELF): ;
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endif
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# Include dependency files.
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-include $(OBJECTS_ALL:.o=.d)
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