[PATCH xserver] squash! sync: Convert from "CARD64" to int64_t.

Keith Packard keithp at keithp.com
Fri Aug 25 01:21:15 UTC 2017

Michel Dänzer <michel at daenzer.net> writes:

> Is assigning an unsigned value with the MSB set to a signed variable
> well-defined in C?

I have no idea. And I just spent a few hours wading through the N1570
draft of the C standard on a related issue. In particular, this is

3   Otherwise, the new type is signed and the value cannot be represented
    in it; either the result is implementation-defined or an
    implementation-defined signal is raised.

I don't think the absence of a cast matters.

Surely some better language lawyer can tell us the answer...

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