I have different controller configurations and want to handle them with same source code. Is there a possibility to enable/disable code parts alla #ifdef in C?

If you use

if x

and

x

is a constant then the compiler will optimize it away.

Thank you for your lightning fast answer.

You can just leave the import.

aha, no overhead generated ?

Completely removed

But how can I switch between different hw configuration files?

what's your exact scenario?

I have different controllers ESP32 - prototype and ESP32-D1mini. The second one has different gpio, no display, no button, ...

Not completely clear what the best approach is. I see some scenarios: - have a different entry file that sets up the constants and then calls a more generic entry-point in a different file. Depending on how this is done, it could still use tree-shaking. - stay generic in code and use assets to figure out which configuration is currently running. In that case the code would be the same for all configurations and therefore no tree-shaking could happen. You could also use the

main

arguments (instead of assets).

What are assets ?