Re: not computable at load time

[Richard Biener <richard.guenther@gmail.com>]

On Fri, May 25, 2018 at 8:05 PM Paul Koning <paulkoning@comcast.net> wrote:

> One of my testsuite failures for the pdp11 back end is
gcc.c-torture/compile/930326-1.c which is:

> struct
> {
>    char a, b, f[3];
> } s;

> long i = s.f-&s.b;

> It fails with "error: initializer element is not computable at load time".
> I don't understand why because it seems to be a perfectly reasonable
> compile time constant; "load time" doesn't enter into the picture that
> I can see.

It means there's no relocation that can express the result of 's.f - &s.b'
and the frontend doesn't consider this a constant expression (likely because
of the conversion).

> If I replace "long" by "short" it works correctly.  So presumably it has
> something to do with the fact that Pmode == HImode.  But how that
translates
> into this failure I don't know.

>          paul