project/unit_tests/Makefile

# Standard variables
CC = gcc
CXX = g++

# Directories: SRC_DIR - root of all sources, BUILD_DIR - temporary build files, OUTPUT_DIR - final binaries dir
SRC_DIR = ../..
BUILD_DIR = build
OUTPUT_DIR = dist
# Output file
EXECUTABLE = $(OUTPUT_DIR)/unit_tests

# Includes
INCLUDE_DIRS = -I $(SRC_DIR)/src -I$(SRC_DIR)/ext/cvshared/cpp/include -I$(SRC_DIR)/ext/boost

# Additional library search paths
LIB_DIRS =

# Additional libraries
LDLIBS = -lcurl -lcrypto -lpthread

# C and C++ flags
CXXFLAGS = -g -MMD -MP $(INCLUDE_DIRS)
CFLAGS = $(CXXFLAGS)

# Linker flags
LDFLAGS = $(LIB_DIRS)

# Utility functions, used later in build
# rfind
define rfind
$(shell find $(1) -name '$(2)')
endef
# add_src_dir
define add_src_dir
$(sort $(call rfind,$(SRC_DIR)/$(strip $(1)),*.c) $(call rfind,$(SRC_DIR)/$(strip $(1)),*.cpp))
endef
# filter_src
define filter_src
$(call $(1),$(3),$(call add_src_dir,$(2)))
endef
# add_src_dir_excluding
define add_src_dir_excluding
$(call filter_src,filter-out,$(1),$(2))
endef
# add_src_dir_including
define add_src_dir_including
$(call filter_src,filter,$(1),$(2))
endef
# c_to_obj
define c_to_obj
$(patsubst $(SRC_DIR)/%.c, $(BUILD_DIR)/%.o, $(1))
endef
# cpp_to_obj
define cpp_to_obj
$(patsubst $(SRC_DIR)/%.cpp, $(BUILD_DIR)/%.o, $(1))
endef
# generate_c_rule
define generate_c_rule
$(2): $(1)
	$$(shell mkdir -p $(dir $(2)))
	$$(CC) $$(CPPFLAGS) $$(CFLAGS) -c $$< -o $$@
endef
# generate_cpp_rule
define generate_cpp_rule
$(2): $(1)
	$$(shell mkdir -p $(dir $(2)))
	$$(CXX) $$(CPPFLAGS) $$(CXXFLAGS) -c $$< -o $$@
endef

# Source files - modify this part if you want to add new source files (*.c *.cpp).
# To recursively add all files in a directory, use:
# $(call add_src_dir, <a directory>)
# To recursively add all files in a directory, except some files, use:
# $(call add_src_dir_excluding, <a directory>, <exclude pattern>)
# To recursively add only some files in a directory, use:
# $(call add_src_dir_including, <a directory>, <include pattern>)
# All directories are specified relatively to $(SRC_DIR).
# The patterns must contain the % character to match a portion of the full file pathname.
SRC = $(call add_src_dir, src)
SRC += $(call add_src_dir_including, ext/cvshared/cpp, \
		%linux/CvHttpRequest.cpp %linux/CvThread.cpp %linux/CvLogger.cpp %linux/CvMutex.cpp %CvString.cpp %CvTime.cpp %CvXcode.cpp)
SRC += $(call add_src_dir_including, tests, \
        %auto_context.cpp %access_number_thread.cpp %memory_storage.cpp %http_request.cpp %unit_tests.cpp)

# Generate a list of object files
OBJ = $(call cpp_to_obj, $(call c_to_obj, $(SRC)))

# Separate .c and .cpp files
C_SRC = $(filter %.c, $(SRC))
CPP_SRC = $(filter %.cpp, $(SRC))

# The default target
all: $(EXECUTABLE)

# Rule for building the executable - depends on all object files
$(EXECUTABLE): $(OBJ)
	$(shell mkdir -p $(dir $(EXECUTABLE)))
	$(CXX) -o $@ $(OBJ) $(LDFLAGS) $(LDLIBS)

# Generate rules for each object file that depends on the corresponding .c file
$(foreach cfile, $(C_SRC), $(eval $(call generate_c_rule, $(cfile), $(call c_to_obj, $(cfile)))))

# Generate rules for each object file that depends on the corresponding .cpp file
$(foreach cppfile, $(CPP_SRC), $(eval $(call generate_cpp_rule, $(cppfile), $(call cpp_to_obj, $(cppfile)))))

# Clean target
clean:
	rm -f -R build/** $(EXECUTABLE)

# Include all the .d files (generated by the -MMD -MP option) corresponding to each of the object files
# This adds to each object target a dependency on all the header files, included in the corresponding c/cpp file
-include $(OBJ:%.o=%.d)