We are currently working on some products that have multiple different microcontrollers (with different compilers as well).
We always use CMake together with ninja, for which a multi-config generator exists.
In our current workflow, we have a CMakePresets.json that specifies configuration presets for the different microcontrollers (using different toolchain files).
The multi-config aspect got me thinking: would it be possible to have use multiple toolchains alongside each other using a multi-config generator as well?
No, this wouldn’t work because there is still only one configure-time CMAKE_CXX_COMPILER_ID and the like. It would only work if we banned configure-time requests of things like that and instead all such logic had to be baked into generator expressions. Of particular interest for your use case would be CMAKE_SYSTEM_PROCESSOR for which I don’t think we even have generator expressions.
