How can I perform pre-main initialization in C/C++ with avr-gcc?

Question

In order to ensure that some initialization code runs before main (using Arduino/avr-gcc) I have code such as the following:

class Init {
public         


        

Answer 1

If you are using the Arduino environment, is there any reason you can't place it in the setup method?

Of course, this is after the Arduino-specific hardware setup, so if you have such low-level stuff that it really has to go before main, then you need some constructor magic.

UPDATE:

Ok, if it has to be done before the main I think the only way is to use a constructor like you already do.

You can always make a preprocessor macro of it:

#define RUN_EARLY(code) \
namespace { \
    class Init { \
        Init() { code; } \
    }; \
    Init init; \
}

Now this should work:

RUN_EARLY(initialize())

But it's not really making things shorter, just moving the verbose code around.