This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: Alignas broken when used with constexpr array data member for structure
- From: Jonathan Wakely <jwakely dot gcc at gmail dot com>
- To: Alec Teal <a dot teal at warwick dot ac dot uk>
- Cc: "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
- Date: Tue, 9 Jan 2018 13:18:44 +0000
- Subject: Re: Alignas broken when used with constexpr array data member for structure
- Authentication-results: sourceware.org; auth=none
- References: <2182301d-14b8-287d-bf6b-d9ed22e34726@warwick.ac.uk>
On 9 January 2018 at 13:15, Alec Teal <a.teal@warwick.ac.uk> wrote:
> 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 told you on IRC, C++ support is implemented in gcc/cp
Why do you keep demanding help and then ignore the answer?
> I did ask in #gcc on freenode - it didn't go so well, sorry to ping you all
> for this.
This belongs on gcc-help not this list.