Makefile目标依赖关系取决于目标名称 [英] makefile target dependencies dependent on target name

问题描述

我有以下规则:

SPECIAL = file1 file2

%.o : %.cpp a.h
    $(CC) -c $(CFLAGS) $< -o $@

我想如果%在$(SPECIAL)中，则将b.h添加到依赖项列表中.

I would like that if % is in $(SPECIAL), then b.h is added to the list of dependencies.

有没有一种方法，而无需重复规则?

Is there a way to do it, without repeating the rule?

推荐答案

您可以单独分配其他依赖项.只需在最后添加一行:

You can assign additional dependencies separately. Just add a line at the end:

$(addsuffix .o,${SPECIAL}): b.h

不必处理依赖关系顺序，可以将规则中的$<替换为$(filter %.cpp,$^).这样%.cpp不必是第一个依赖项.

To not have to deal with dependency order, replace $< in the rule with $(filter %.cpp,$^). This way %.cpp does not have to be the first dependency.

理想情况下，您希望自动生成标头依赖项，以避免手动指定它们.

Ideally, you want the header dependencies to be generated automatically to avoid specifying them manually.

最简单的自动依赖项生成:

The most simple automatic dependency generation:

%.o : %.cpp 
    $(CXX) -c -o $@ -MD -MP $(CXXFLAGS) $(filter %.cpp,$^)

ifneq ($(MAKECMDGOALS),clean)
-include $(wildcard *.d)
endif   

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