compiler errors - How does gcc know that an integer value is too large?

Question

When running the simple C program

int main()
{
    int x = 123123123123;
    return 0;
}

gcc warns: warning: overflow in implicit constant conversion [-Woverflow].

I'm curous at what point in the compilation of the source code (eg. lexing, parsing, ...) is the compiler able to understand that a constant is too large for its type? I've had a look through the gcc source code but the only reference to "implicit constant conversion" that I can find exists in two test cases that don't detail the implementation.

question from:https://stackoverflow.com/questions/65929455/how-does-gcc-know-that-an-integer-value-is-too-large

Answer 1

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