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Makefile
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### common goals ###
# make test # runs unittests and memory checks
# make debug # runs GDB on unittest
# make run # actually runs experiment
# make all # makes all executables
# # (based on source files like %.main.c containing int main())
# The object files depend only on those headers which their source include
### directory layout ###
BUILD_DIR = build
SRC_DIR = src
INC_DIR = ./include
### variables containing lists of files ###
# reactants
C_SRCS := $(shell find $(SRC_DIR) -name *.c -printf '%P\n')
CC_SRCS := $(shell find $(SRC_DIR) -name *.cc -printf '%P\n')
MAIN_C_SRCS := $(filter %.main.c,$(C_SRCS))
MAIN_CC_SRCS := $(filter %.main.cc,$(CC_SRCS))
# products
OBJS := $(C_SRCS:%.c=$(BUILD_DIR)/%.o) $(CC_SRCS:%.cc=$(BUILD_DIR)/%.o)
DEPS := $(OBJS:.o=.d)
MAIN_OBJS := $(MAIN_C_SRCS:%.c=$(BUILD_DIR)/%.o) $(MAIN_CC_SRCS:%.cc=$(BUILD_DIR)/%.o)
OTHER_OBJS := $(filter-out $(MAIN_OBJS),$(OBJS))
MAIN_EXES := $(MAIN_OBJS:.main.o=.out)
### commandline flags/vairbales ###
MKDIR_P ?= mkdir -p
CC := clang
CPP := clang++
INC_FLAGS := -I$(INC_DIR)
WFLAGS := -Wall -Wextra -Wno-unused-parameter
CFLAGS := $(INC_FLAGS) $(WFLAGS)
CPPFLAGS := $(INC_FLAGS) $(WFLAGS) -std=c++11
DBG_FLAGS := -Og -g
OPT_FLAGS := -O2 -DNDEBUG
### compile executables ###
all: $(MAIN_EXES) $(addsuffix dbg,$(MAIN_EXES))
distclean:
$(RM) -r $(BUILD_DIR)
.PHONY: clean
clean:
$(RM) -r $(BUILD_DIR)
# make dependent makefiles before continuing
make depends
.PHONY: clean
$(BUILD_DIR)/%.out: $(BUILD_DIR)/%.main.o $(OTHER_OBJS)
$(CPP) $^ -o $@ $(CPPFLAGS)
# same executables, but linked with debug objects
$(BUILD_DIR)/%.outdbg: $(BUILD_DIR)/%.main.odbg $(addsuffix dbg,$(OTHER_OBJS))
$(CPP) $^ -o $@ $(CPPFLAGS)
### compile object files ###
$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c
$(CC) $(CFLAGS) $(OPT_FLAGS) -c $< -o $@
$(BUILD_DIR)/%.o: $(SRC_DIR)/%.cc
$(CPP) $(CPPFLAGS) $(OPT_FLAGS) -c $< -o $@
# same objects, but compiled with debug flags
$(BUILD_DIR)/%.odbg: $(SRC_DIR)/%.c
$(CC) $(CFLAGS) $(DBG_FLAGS) -c $< -o $@
$(BUILD_DIR)/%.odbg: $(SRC_DIR)/%.cc
$(CPP) $(CPPFLAGS) $(DBG_FLAGS) -c $< -o $@
### generates Makefile rules which add dependencies from #include's ##
# $(DEPS)
$(BUILD_DIR)/%.d: $(SRC_DIR)/%.c
$(MKDIR_P) $(dir $@)
$(CC) $(CFLAGS) -MM -MF $@ -MT $(BUILD_DIR)/$(<:.c=.o) $<
$(BUILD_DIR)/%.d: $(SRC_DIR)/%.cc
$(MKDIR_P) $(dir $@)
$(CPP) $(CPPFLAGS) -MM -MF $@ -MT $(BUILD_DIR)/$(<:.c=.o) $<
depends: $(DEPS)
-include $(DEPS)
### project specific targets ###
# TEST_EXE := $(BUILD_DIR)/src/task_engine/test.outdbg
# EXPERIMENT_EXE := $(BUILD_DIR)/src/task_engine/experiment.out
# run: $(EXPERIMENT_EXE)
# ./$(EXPERIMENT_EXE)
# debug: $(TEST_EXE)
# gdb "$(TEST_EXE)" -q -ex run -ex backtrace
# .PHONY: debug
# test: $(TEST_EXE)
# valgrind -q $(TEST_EXE)
# # --track-origins=yes --leak-check=full
# .PHONY: test
### references ###
# see https://spin.atomicobject.com/2016/08/26/makefile-c-projects/
# see "Recursive Make Considered Harmful" Peter Miller