CODEWITHSUNDEEP
cmake
Bart
Bart

Reputation: 1653

Is it possible to build binaries for different targets using CMake?

I'm considering to use CMake for projects targeting a microcontroller. I found out how to create a toolchain file and invoke cmake -DCMAKE_TOOLCHAIN_FILE=Path/To/Toolchain.cmake to make CMake do cross-compiling.

However most projects that I work on have also code that must be compiled for the host platform. These are often unit tests or other test tools, which share most part of their code with the binary that will run on the microcontroller. A rare case might be a project that even has two processors having a different instruction architectures, thus needing a host compiler and two different cross compilers.

I'd like to have one build that rules them all. Is it possible to have a construction that I only need to call cmake /path/to/source && make, or is the only solution having multiple 'root' CMakeList.txt files, each for every target?

Upvotes: 2

Views: 1483

Answers (1)

ComicSansMS
ComicSansMS

Reputation: 54589

Each cmake run will target one specific generator and thus one platform.

What you want can be achieved by having one hierarchy of CMakeLists files for each platform. You need to get to a point where doing a succession of cmake .. && make calls will build the whole project.

Then write a master CMakeLists that executes all of those separate build steps for you, e.g. through ExternalProject_Add or by using custom commands. Depending on the structure of your project it might make sense to have only the tools required for building being processed this way and add the sources for the actual project directly to the master CMakeLists instead.

Upvotes: 2

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