我的造文件有这样一行的线
CFLAGS = -c -g -D OPT1 -D OPT2
我想通过这样的命令行来通过这些争论
make ARG1= OPT1 ARG2 =OPT2
如果我不通过命令行通过这些参数, 我要使用文件来使用在文件文件中定义的默认值。 我该怎么做?
只是做这样的事情 在文件:
OPT1 = MY_OPT_1 # defaults
OPT2 = MY_OPT_2
CFLAGS = -c -g -D $(OPT1) -D $(OPT2)
然后在命令线上:
$ make -e OPT1=SOME_OTHER_OPT1 OPT2=SOME_OTHER_OPT2
在命令行指定 OPT1 和/或 OPT2 的 flues时,这些功能将超越 makefile 中的默认值。
请注意,您可能希望大多数情况下都使用 -e 选项,使用 make 来强制重新构建所有新 OPT1 , OPT2 。
另一种方式是使用 ? {{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{> 指派运算运算符}}。只有在没有在运行时定义该值时,它才指定该值。
OPT1?=opt1_default
OPT2?=opt2_default
你们在召唤的时候,
make OPT1=a OPT2=b
# OR
make # to use default values
"https://www.gnu.org/ software/ make/manual/html_node/Setting.html" rel="没有跟随 noreferrer"> more info
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