Question

Is there a way to get the gcc preprocessor to replace a type with what defined by the typedef, i.e.

something like this:

typedef unsigned char Uint8

int main(void)
{
    Uint8 a = 1;
    Uint8 b = 2;
    Uint8 c;

    c = a + b;

    return 0;
}

Would get preprocessed into something like this:

int main(void)
{
    unsigned char a = 1;
    unsigned char b = 2;
    unsigned char c;

    c = a + b;

    return 0;
}

Answer 1

No, there isn’t, because type aliasing is part of compilation stage and not a pre-processing stage. Therefore pre-processor cannot know anything about types by design and cannot perform any operations on those types. Also, you forgot to put ; at the end of typedef statement.