如何将宏定义作为make的参数传递? [英] How can a macro definition be passed as an argument to make?

问题描述

我希望通过将C宏作为参数传递给make来定义C宏，该宏从命令行调用.

I wish to define a C macro by passing it as an argument to make, which is called from the command-line.

背景:我想指令要包括在我的C源代码被选择特定构建选项时.因此，我希望通过make命令行完成此操作，而不是修改源代码或 makefile.

Background: I want the directive #define ENABLE_OPT 1 to be included in my C source code when a certain build option is chosen. Thus, I want this to be done via the make command-line instead of modifying the source code or the makefile.

如何实现?我发现make -DENABLE_OPT=1 -f Makefile会抛出错误，指出"E"，"N"等是要使之无效的参数.

How can this be achieved? I find that make -DENABLE_OPT=1 -f Makefile throws errors that 'E', 'N' etc. are invalid arguments to make.

推荐答案

您可以使用--eval，它将把字符串作为makefile语句求值:

You can use --eval, which will evaluate the string as a makefile statement:

make --eval="FLAGS+= -D ENABLE_OPT=1"

然后，将make变量FLAGS用作编译器参数来编译代码.

The make variable FLAGS is then used as a compiler argument to compile the code.

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