英文:
How do I create object files into a different directory than Makefile's one?
问题
I'm new on using Makefiles because I've been programming with VS2019 on Windows, solving all my compilation and linking problems.
This is the result:
BUILD_DIR:= ./buildSRC_DIRS := ./srcINCL_DIR := ./includesCC := /usr/bin/g++ #Compiler usedLVERSION := -std=c++17 #Language VersionCXXFLAGS := -g #Cpp flagsCFLAGS := -Wall #Compiler FlagsLFLAGS := -lstdc++fs #Linker FlagsSRCS := Audio.cpp Song.cpp Visual.cpp VisualSong.cppLIBS :=INCLUDES := $(SRCS:%.cpp=$(INCL_DIR)/%.h)OBJS := $(SRCS:%.cpp=$(BUILD_DIR)/%.o)PROG := progName.exeprogName: $(OBJS)$(CC) $(CFLAGS) $(CXXFLAGS) -o $(INCLUDES) $(PROG) $(OBJS)$(BUILD_DIR)/%.o: $(INCL_DIR)/%.h $(SRC_DIRS)/%.cpp$(CC) ${CFLAGS} $(CXXFLAGS) $(LVERSION) ${LFLAGS} -c $^.PHONY: progNameclean:/bin/rm -rf build/*.o $(PROG) includes/*.gch
This makefile works until is trying to look on objects file, supposedly created on build directory but, in the end, they're created in Makefile's directory, which is an inconvenient since all what i want is to have separated files for organization purposes.
I know that somehow using implicit rules that are using the dst's directory should do the trick, but i think that I'm missing something on the way...
I'm on a Windows 10 machine with WSL for Ubuntu, but this shouldn't be a problem at all for this problem.
Could anyone explain to me what am I missing?
英文:
I'm new on using Makefiles because I've been programming with VS2019 on Windows, solving all my compilation and linking problems.
This is the result:
BUILD_DIR:= ./buildSRC_DIRS := ./srcINCL_DIR := ./includesCC := /usr/bin/g++ #Compiler usedLVERSION := -std=c++17 #Language VersionCXXFLAGS := -g #Cpp flagsCFLAGS := -Wall #Compiler FlagsLFLAGS := -lstdc++fs #Linker FlagsSRCS := Audio.cpp Song.cpp Visual.cpp VisualSong.cppLIBS :=INCLUDES := $(SRCS:%.cpp=$(INCL_DIR)/%.h)OBJS := $(SRCS:%.cpp=$(BUILD_DIR)/%.o)PROG := progName.exeprogName: $(OBJS)$(CC) $(CFLAGS) $(CXXFLAGS) -o $(INCLUDES) $(PROG) $(OBJS)$(BUILD_DIR)/%.o: $(INCL_DIR)/%.h $(SRC_DIRS)/%.cpp$(CC) ${CFLAGS} $(CXXFLAGS) $(LVERSION) ${LFLAGS} -c $^.PHONY: progNameclean:/bin/rm -rf build/*.o $(PROG) includes/*.gch
This makefile works until is trying to look on objects file, supposedly created on build directory but, in the end, they're created in Makefile's directory, which is an inconvenient since all what i want is to have separated files for organization purposes.
I know that somehow using implicit rules that are using the dst's directory should do the trick, but i think that I'm missing something on the way...
I'm on a Windows 10 machine with WSL for Ubuntu, but this shouldn't be a problem at all for this problem.
Could anyone explain to me what am I missing?
答案1
得分: 2
看这个规则：
$(BUILD_DIR)/%.o: $(INCL_DIR)/%.h $(SRC_DIRS)/%.cpp$(CC) ${CFLAGS} $(CXXFLAGS) $(LVERSION) ${LFLAGS} -c $^
表面上它是用来构建build/foo.o的规则，但是配方($(CC)…)实际上构建了foo.o。有一个简单的修复方法：
$(BUILD_DIR)/%.o: $(INCL_DIR)/%.h $(SRC_DIRS)/%.cpp$(CC) ${CFLAGS} $(CXXFLAGS) $(LVERSION) ${LFLAGS} -c $^ -o $@
一旦这样工作了，我建议您再做一个更改：
$(BUILD_DIR)/%.o: $(SRC_DIRS)/%.cpp $(INCL_DIR)/%.h$(CC) ${CFLAGS} $(CXXFLAGS) $(LVERSION) ${LFLAGS} -c $< -o $@
如果您需要进一步的帮助，请告诉我。
英文:
Look at this rule:
$(BUILD_DIR)/%.o: $(INCL_DIR)/%.h $(SRC_DIRS)/%.cpp$(CC) ${CFLAGS} $(CXXFLAGS) $(LVERSION) ${LFLAGS} -c $^
Ostensibly it is the rule to build build/foo.o, but the recipe ($(CC)...) actually builds foo.o. There is an easy fix:
$(BUILD_DIR)/%.o: $(INCL_DIR)/%.h $(SRC_DIRS)/%.cpp$(CC) ${CFLAGS} $(CXXFLAGS) $(LVERSION) ${LFLAGS} -c $^ -o $@
Once that works I suggest you make one further change:
$(BUILD_DIR)/%.o: $(SRC_DIRS)/%.cpp $(INCL_DIR)/%.h$(CC) ${CFLAGS} $(CXXFLAGS) $(LVERSION) ${LFLAGS} -c $< -o $@
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
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