Re: [X-POST] Alignas broken when used with constexpr array data member for structure

[Jonathan Wakely <jwakely.gcc@gmail.com>]

And I've now told you both on IRC and in reply to your original email,
the directory is gcc/cp

On 9 January 2018 at 13:39, Alec Teal <a.teal@warwick.ac.uk> wrote:
> Per recommendation asking on GCC help
>
>
>
> -------- Forwarded Message --------
> Subject:        Alignas broken when used with constexpr array data member
> for structure
> Date:   Tue, 9 Jan 2018 13:15:37 +0000
> From:   Alec Teal <a.teal@warwick.ac.uk>
> To:     gcc@gcc.gnu.org <gcc@gcc.gnu.org>
>
>
>
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>
>
> Hi there,
>
> In GCC 4.8.4 I have something like the following:
>
> constexpr int x = 5;
>
> constexpr int y = 4;
>
> struct alignas(y) my_data_block {
>
>    char data[x];
>
> };
>
>
> And it causes some weird errors to the tune of "size of array ‘data’ is
> not an integral constant-expression" in the presence of the alignas
>
> This is a pretty nasty bug and means it's not implemented as I thought.
> I don't know the front-ends (but I do actually know GIMPLE-low and below
> quite well, love the pattern matching) and I'd like to dig more, it's
> almost certainly fixed - this is just for personal curiosity.
>
> Where would I look? A 1 line reply with a directory would be a great
> start; even if it's just a guess.
>
> I did ask in #gcc on freenode - it didn't go so well, sorry to ping you
> all for this.
>
>
> Alec
>