Makefile 在数组中查找

Question

如果我有这样的事情:

PROJECTS += path/to/first
PROJECTS += path/to/second
PROJECTS += path/to/third

和

LIBS += lib_output/first.lib
LIBS += lib_output/second.lib
LIBS += lib_output/third.lib

我如何从 PROJECTS += path/to/first 关联项目与 LIBS += lib_output/first.lib ?生成文件中是否有类似哈希图的东西？或者可以在数组中搜索？

Answer 1

您可以使用 computed variable names 模拟查找表而 make 变量名的事实可以包括 some special characters像点和正斜杠:

PROJECTS += path/to/first
PROJECTS += path/to/second
PROJECTS += path/to/third

LIBS += lib_output/first.lib
LIBS += lib_output/second.lib
LIBS += lib_output/third.lib

lookup.path/to/first  := lib_output/first.lib
lookup.path/to/second := lib_output/second.lib
lookup.path/to/third  := lib_output/third.lib

path := path/to/first
$(info ${path} -> ${lookup.${path}})
path := path/to/second
$(info ${path} -> ${lookup.${path}})
path := path/to/third
$(info ${path} -> ${lookup.${path}})

输出:

$ make
path/to/first -> lib_output/first.lib
path/to/second -> lib_output/second.lib
path/to/third -> lib_output/third.lib