# # Makefile # # Copyright (C) 2020 Christos Choutouridis # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Lesser General Public License as # published by the Free Software Foundation, either version 3 # of the License, or (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public License # along with this program. If not, see . # # ========== Project settings ========== TARGET := matmul SRC_DIR := src INC_DIR := EXC_FILE := # build directories BUILD_DIR := bin OBJ_DIR := $(BUILD_DIR)/obj DEP_DIR := $(BUILD_DIR)/.dep # ========== Compiler settings ========== CXX := gcc CPP := gcc -E CSIZE := size CFLAGS := -std=gnu99 -Wall -Wextra DEB_FLAGS := -DDEBUG -g3 REL_FLAGS := -O3 LDFLAGS := -lm PRE_DEFS := # # =========== Main body and Patterns =========== # INC := $(foreach dir,$(INC_DIR),-I$(dir)) DEF := $(foreach def,$(PRE_DEFS),-D$(def)) # source files # recursive search into current and source directories SRC := $(wildcard *.c) SRC += $(foreach dir,$(SRC_DIR),$(wildcard $(dir)/*.c)) SRC += $(foreach dir,$(SRC_DIR),$(wildcard $(dir)/**/*.c)) # exclude every file from the exclude file list SRC := $(filter-out $(wildcard $(EXC_FILE)),$(SRC)) OBJ := $(foreach file,$(SRC:%.c=%.o),$(OBJ_DIR)/$(file)) DEP := $(foreach file,$(SRC:%.c=%.d),$(DEP_DIR)/$(file)) # Make Dependencies pattern. # This little trick enables recompilation only when dependencies change # and it does so for changes both in source AND header files ;) # # It is based on Tom Tromey's method. # # Invoke cpp to create makefile rules with dependencies for each source file $(DEP_DIR)/%.d: %.c @mkdir -p $(@D) @$(CPP) $(CFLAGS) $(INC) $(DEF) -MM -MT $(OBJ_DIR)/$(<:.c=.o) -MF $@ $< # objects depent on .c AND dependency files, which have an empty recipe $(OBJ_DIR)/%.o: %.c $(DEP_DIR)/%.d @mkdir -p $(@D) $(CXX) -c $(CFLAGS) $(INC) $(DEF) -o $@ $< # empty recipe for dependency files. This prevents make errors $(DEP): # now include all dependencies # After all they are makefile dependency rules ;) include $(wildcard $(DEP)) # main target rule $(BUILD_DIR)/$(TARGET): $(OBJ) @mkdir -p $(@D) @echo Linking to target: $(TARGET) @echo $(CXX) $(LDFLAGS) -o $(@D)/$(TARGET) '$$(OBJ)' @$(CXX) $(LDFLAGS) -o $(@D)/$(TARGET) $(OBJ) @echo @echo Print size information @$(CSIZE) $(@D)/$(TARGET) @echo Done .PHONY: clean clean: @echo Cleaning build directories @rm -rf $(OBJ_DIR) @rm -rf $(DEP_DIR) @rm -rf $(BUILD_DIR) # # ============ User Rules ============= # .PHONY: debug debug: CFLAGS += $(DEB_FLAGS) debug: $(BUILD_DIR)/$(TARGET) .PHONY: release release: CFLAGS += $(REL_FLAGS) release: $(BUILD_DIR)/$(TARGET) .PHONY: all all: clean release