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# Makefile for C++ |
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# Copyright (C) 2019-2020 Christos Choutouridis <christos@choutouridis.net> |
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# |
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# This program 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 |
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# published by the Free Software Foundation, either version 3 |
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# of the License, or (at your option) any later version. |
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# |
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# This program 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 program. If not, see <http://www.gnu.org/licenses/>. |
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# |
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# ============== Project settings ============== |
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# Project's name |
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PROJECT := kNN |
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# Excecutable's name |
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TARGET := knn |
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# Source directories list(space seperated). Makefile-relative path, UNDER current directory. |
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# Note: To support parent relative paths uncomment abspath line in main body below |
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SRC_DIR_LIST := src |
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# Include directories list(space seperated). Makefile-relative path. |
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INC_DIR_LIST := inc |
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# Exclude files list(space seperated). Filenames only. |
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# EXC_FILE_LIST := bad.cpp old.cpp |
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# Build directories |
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BUILD_DIR := bin |
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OBJ_DIR := $(BUILD_DIR)/obj |
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DEP_DIR := $(BUILD_DIR)/.dep |
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# ========== Compiler settings ========== |
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# Compiler flags for debug and release |
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DEB_CFLAGS := -DDEBUG -g3 -Wall -Wextra |
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REL_CFLAGS := -Wall -Wextra -O2 |
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# Pre-defines |
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# PRE_DEFS := MYCAB=1729 SUPER_MODE |
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# ============== Linker settings ============== |
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# Linker flags (example: -pthread -lm) |
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LDFLAGS := |
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# Map output file |
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MAP_FILE := output.map |
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MAP_FLAG := -Xlinker -Map=$(BUILD_DIR)/$(MAP_FILE) |
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# ============== Docker settings ============== |
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# We need: |
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# - Bind the entire project directory(the dir that icludes all the code) as volume. |
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# - In docker instance, change to working directory(where the makefile is). |
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DOCKER_VOL_DIR := $${PWD} |
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DOCKER_WRK_DIR := |
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DOCKER_RUN := docker run |
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DOCKER_FLAGS := --rm -v $(DOCKER_VOL_DIR):/usr/src/$(PROJECT) -w /usr/src/$(PROJECT)/$(DOCKER_WRK_DIR) |
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# docker invoke mechanism (edit with care) |
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# note: |
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# Here, `DOCKER` variable is empty. Rules can assign `DOCKER := DOCKER_CMD` when docker |
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# functionality is needed. |
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DOCKER_CMD = $(DOCKER_RUN) $(DOCKER_FLAGS) $(IMAGE) |
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DOCKER := |
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# ============== Tool selection ============== |
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# compiler and compiler flags. |
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CSIZE := size |
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CFLAGS := $(DEB_CFLAGS) |
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CXX := g++ |
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# |
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# =========== Main body and Patterns =========== |
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# |
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# Uncomment to support Win file extension for local builds |
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#ifeq ($(OS), Windows_NT) |
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# TARGET := $(TARGET).exe |
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#endif |
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INC := $(foreach dir,$(INC_DIR_LIST),-I$(dir)) |
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DEF := $(foreach def,$(PRE_DEFS),-D$(def)) |
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EXC := $(foreach fil,$(EXC_FILE_LIST), \ |
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$(foreach dir,$(SRC_DIR_LIST),$(wildcard $(dir)/$(fil))) \ |
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) |
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# source files. object and dependencies list |
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# recursive search into current and source directories |
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SRC := $(wildcard *.cpp) |
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SRC += $(foreach dir,$(SRC_DIR_LIST),$(wildcard $(dir)/*.cpp)) |
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SRC += $(foreach dir,$(SRC_DIR_LIST),$(wildcard $(dir)/**/*.cpp)) |
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SRC := $(filter-out $(EXC),$(SRC)) |
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# Uncomment to support parent relative source paths |
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#SRC := $(abspath $(SRC)) |
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OBJ := $(foreach file,$(SRC:%.cpp=%.o),$(OBJ_DIR)/$(file)) |
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DEP := $(foreach file,$(SRC:%.cpp=%.d),$(DEP_DIR)/$(file)) |
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# Make Dependencies pattern. |
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# This little trick enables recompilation only when dependencies change |
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# and it does so for changes both in source AND header files ;) |
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# |
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# It is based on Tom Tromey's method. |
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# |
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# Invoke cpp to create makefile rules with dependencies for each source file |
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$(DEP_DIR)/%.d: %.cpp |
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@mkdir -p $(@D) |
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@$(DOCKER) $(CXX) -E $(CFLAGS) $(INC) $(DEF) -MM -MT $(OBJ_DIR)/$(<:.cpp=.o) -MF $@ $< |
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# objects depent on .cpp AND dependency files, which have an empty recipe |
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$(OBJ_DIR)/%.o: %.cpp $(DEP_DIR)/%.d |
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@mkdir -p $(@D) |
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$(DOCKER) $(CXX) -c $(CFLAGS) $(INC) $(DEF) -o $@ $< |
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# empty recipe for dependency files. This prevents make errors |
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$(DEP): |
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# now include all dependencies, after all they are makefile dependency rules ;) |
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include $(wildcard $(DEP)) |
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# main target rule |
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$(BUILD_DIR)/$(TARGET): $(OBJ) |
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@mkdir -p $(@D) |
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@echo Linking to target: $(TARGET) |
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@echo $(DOCKER) $(CXX) $(LDFLAGS) $(MAP_FLAG) -o $(@D)/$(TARGET) '$$(OBJ)' |
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@$(DOCKER) $(CXX) $(LDFLAGS) $(MAP_FLAG) -o $(@D)/$(TARGET) $(OBJ) |
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@echo |
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@echo Print size information |
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@$(CSIZE) $(@D)/$(TARGET) |
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@echo Done |
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.PHONY: clean |
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clean: |
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@echo Cleaning build directories |
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@rm -rf $(OBJ_DIR) |
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@rm -rf $(DEP_DIR) |
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@rm -rf $(BUILD_DIR) |
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# |
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# ================ Local build rules ================= |
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# Use cases: |
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# - local builds in terminal |
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# example: |
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# make debug |
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# - build inside container |
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# example in a yml: |
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# image: gcc:8 |
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# build: |
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# stage: build |
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# - make release |
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# ... etc |
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# test: |
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# stage: test |
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# - bin/out |
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# ... etc |
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# |
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debug: CFLAGS += $(DEB_FLAGS) |
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debug: $(BUILD_DIR)/$(TARGET) |
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release: CFLAGS += $(REL_FLAGS) |
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release: $(BUILD_DIR)/$(TARGET) |
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.PHONY: all |
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all: release |
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# |
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# ================ Docker based rules ================ |
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# Use case: |
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# - build localy using via terminal or script in order |
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# to compile for various compilers, versions, etc... |
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# example in bash: |
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# #!/bin/bash |
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# for im in gcc:8 gcc:9 myImage; do |
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# make IMAGE="$im" dock |
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# done |
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# |
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dock: DOCKER := $(DOCKER_CMD) |
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dock: $(BUILD_DIR)/$(TARGET) |