[Issue 9766] align(n) with n compile-time constant

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=9766

Leandro Lucarella <leandro.lucarella at sociomantic.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|rejects-valid               |industry, spec
                 CC|                            |leandro.lucarella at sociomant
                   |                            |ic.com

--- Comment #2 from Leandro Lucarella <leandro.lucarella at sociomantic.com> ---
Removed reject-invalid keyword as the specification indicates the syntax is:

align ( IntegerLiteral )

In Sociomantic, being able to specify a compile-time calculated value to align
would be useful to overcome alignment issues with structs with static arrays in
them. For example:

---
struct E1
{
    byte key;
    ubyte[(char[]).sizeof] val;
}
---

E1.key offset: 0LU, E1.val offset: 1LU

This is very impolite to the GC. Trying the same in C, it works the same, and
since D defines his alignment specification in terms of the host C compiler,
this is technically not a bug but a feature. But a better way to overcome this
than manually adding padding bytes between both members would be appreciated
(using align(8) is not portable, and starting a version() madness because of
this doesn't seem like a good option).

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