How to make GCC evaluate functions at compile time?

Question

I am thinking about the following problem: I want to program a microcontroller (let\'s say an AVR mega type) with a program that uses some sort of look-up tables.

Th

Answer 1

What you are trying is not part of the C language. In situations like this, I have written code following this pattern:

#if GENERATE_SOURCECODE
int main (void)
{
    ... Code that uses printf to write C code to stdout
}
#else
    // Source code generated by the code above
    ... Here I paste in what the code above generated

    // The rest of the program
#endif

Every time you need to change it, you run the code with GENERATE_SOURCECODE defined, and paste in the output. Works well if your code is self contained and the generated output only ever changes if the code generating it changes.