CMake build multiple targets in different build directories

Question

I have the following CMake structure:

CMakelists.txt toolchain.cmake folder1 ----CMakelists.txt folder2 ----CMakelists.txt etc..

My first-level CMakelists.txt file includes the other subdirectories. Now I want to build my code for a different target.

The manual way is:

1. mkdir hostBuild cd hostBuild cmake .. make 2. mkdir crossBuild cd crossBuild cmake .. --DCMAKE_TOOLCHAIN_FILE=toolchain.cmake make

Is it possible that this process can run automatically?

For example, I just have to run cmake . at my first level.

Is something like this is possible?

Community · Accepted Answer · 2017-05-23 12:31:27Z

No. The recommendation would be to just put your manual steps into a shell script.

CMake can only handle one compiler/make environment at a time (if you switch the compiler you need a different binary output directory).

Especially a toolchain file that does contain SET(CMAKE_SYSTEM_NAME ...) does change the whole outcome of the configuration/generation process.

And you could make use of some CMake command line options in your shell script:

if [ ! -d hostBuild ]; then cmake -E make_directory hostBuild cmake -E chdir hostBuild cmake .. fi cmake --build hostBuild ...

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