英文:
Parameterize CMake target at build stage and not at configuration stage
问题
CMake是否有一种方法可以创建一个目标，并在构建时允许用户手动提供参数？
我想要的是像平常一样运行CMake，然后在调用make时能够提供一个参数，例如：
make mytarget MYPARAMETER=123
MYPARAMETER的值将成为gcc调用中的预处理器定义，如 gcc -DMYPARAMETER=123。
"mytarget"目标应该以这样一种方式设置，以便如果MYPARAMETER的值发生更改，目标将被重新构建。
我考虑使用环境变量来实现这一点，但实际上任何构建时参数的方案都适用于我的用例。我想避免的是每次更改MYPARAMETER的值时都必须重新配置整个项目，因为它几乎在每次构建时都会更改。
英文:
Is there any facility in CMake to create a target with an explicit parameter to be provided manually by the user at build-time?
What I would like is to run CMake like normal, and then to be able to provide a parameter at the time that I invoke make, as in:
make mytarget MYPARAMETER=123
The value of MYPARAMETER will become a preprocessor definition in the invokation of gcc, as in gcc -DMYPARAMETER=123.
The target "mytarget" should be set up in such a way that if the value of MYPARAMETER changes, then the target will be re-built.
I was thinking of doing this with environment variables but really any scheme for build-time parameters would work for my use case. What I want to avoid is having to reconfigure my whole project each time I change the value of MYPARAMETER, since it changes on almost every build.
答案1
得分: 1
There is no facility in CMake to create a target with an explicit parameter to be provided manually by the user at build-time. 没有CMake中的任何功能来创建一个目标，用户需要在构建时手动提供显式参数。
You have to rerun CMake configuration stage. 您需要重新运行CMake配置阶段。
You can create your own compiler. Write the following shell script /tmp/cc with executable permissions:
您可以创建自己的编译器。编写以下具有可执行权限的shell脚本/tmp/cc：
#!/bin/sh
gcc -DMYPARAMETER="$MYPARAMETER" "$@"
Configure your cmake with cmake -DCMAKE_C_COMPILER=/tmp/cc ... and compile by exporting the variable first into env MYPARAMETER=123 cmake --build .... That way you can "inject" the value of MYPARAMETER into the compiler invocation.
使用cmake -DCMAKE_C_COMPILER=/tmp/cc ...配置您的cmake，并通过首先将变量导出到环境中来编译MYPARAMETER=123 cmake --build ...。这样，您可以将MYPARAMETER的值“注入”到编译器调用中。
英文:
> Is there any facility in CMake to create a target with an explicit parameter to be provided manually by the user at build-time?
No. You have to rerun CMake configuration stage.
You can create your own compiler. Write the following shell script /tmp/cc with executable permissions:
#!/bin/sh
gcc -DMYPARAMETER="$MYPARAMETER" "$@"
Configure your cmake with cmake -DCMAKE_C_COMPILER=/tmp/cc ... and compile by exporting the variable first into env MYPARAMTER=123 cmake --build .... That way you can "inject" the value of MYPARAMETER into the compiler invocation.
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