与 gmake 的自动头依赖关系 [英] Automatic header dependencies with gmake

问题描述

已编辑

我正在尝试重新编译源文件，而不必为 makefile 中的每个 CPP 指定头文件.

I'm trying to have source files recompiled without having to specify header files for each CPP in the makefile.

我想:

#CoreObj1.cpp(and .h)
#CoreObj2.cpp(and .h)

#This is the makefile.

CORE_COMPONENT_OBJECTS = 
  obj/CoreObj1.o 
  obj/CoreObj2.o 

# Objects
obj/%.o: %.cpp obj/%.d
        @mkdir -p obj
        $(CXX) $(CXX_CFLAGS) -c $*.cpp -o $@

# Dependencies
obj/%.d: %.cpp
        @mkdir -p obj
        $(CXX) $(CXX_CFLAGS) -MM -MF $@ $<

DEPS = $(CORE_COMPONENT_OBJECTS:.o=.d)

ifneq ($(MAKECMDGOALS),clean)
-include $(DEPS)
endif   

但是修改一个头文件不会触发包含它的源文件被重新编译.

But modifying a header files does not trigger the source files including it to be recompiled.

注意: 事实上，如果我的 .o、.d 和 .cpp 在同一个文件夹中，它就可以工作.但是如果我的 .d 和 .o 在 obj/文件夹中，它不会触发重新编译.

NOTE: In fact, it works if my .o, .d and .cpp are in the same folder. But if my .d and .o are in a obj/ folder, it doesn't trigger the recompile.

推荐答案

您没有将依赖文件作为编译规则的先决条件.应该是这样的:

You don't have dependency file as a prerequisite for compilation rule. Should be something like this:

#This is the rule for creating the dependency files
src/%.d: src/%.cpp
    $(CXX) $(CXX_CFLAGS) -MM -MF $(patsubst obj/%.o,obj/%.d,$@) -o $@ $<

obj/%.o: %.cpp %.d
    $(CXX) $(CXXFLAGS) -o $@ -c $<

-include $(SRC:%.cpp=%.d)

最后一个字符串增加了对标题的依赖.

The last string adds dependency on headers.

编辑

我看你有

-include $(DEPS)

但检查 $(warning DEPS = $(DEPS)) 是否真的包含现有文件，否则只需默默忽略这些.

but check with $(warning DEPS = $(DEPS)) whether you really include existing files, otherwise make just silently ignore these.

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