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

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More specific please, there's a lot in here.

For example I had a look in constexpr - seems like a good place to start! 7k lines; things may have moved.

It seems I might have been wrong, I need more than a directory!

I'm currently trying to set a breakpoint where errors are emitted (and hopefully find something on the stack, even if it's a function doing the passes!) - it's hard to find!

Usually I'd take more of a guess but this bug means I'm very far off the mark with the implementation.

Alec


On 09/01/18 13:40, Jonathan Wakely wrote:
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@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
To:     gcc@xxxxxxxxxxx <gcc@xxxxxxxxxxx>



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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





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