自动头依赖用gmake命令 [英] Automatic header dependencies with gmake

问题描述

EDITED

我想有源文件重新编译，而无需在Makefile中指定文件头CPP。

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

我到：

#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   

但修改的头文件不会触发源文件，包括它重新编译。

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

注意：其实，它的工作原理，如果我的.o，.D和.cpp都在同一个文件夹中。但如果我的.D和的.o是在OBJ /文件夹，它不会引发重新编译。

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

您不必依赖文件为prerequisite编译规则。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)

最后一个字符串将依赖于头。

The last string adds dependency on headers.

修改

我看你有没有

-include $(DEPS)

但 $检查（警告DEPS = $（DEPS））你是否真的有存在的文件，以其他方式只是默默地忽略这些。

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

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