[GSoC] Header Generation for C/C++
edi33416 at gmail.com
Thu Sep 5 11:25:47 UTC 2019
On Friday, 2 August 2019 at 13:17:46 UTC, Gregor Mückl wrote:
> On Tuesday, 30 July 2019 at 14:50:15 UTC, Eduard Staniloiu
>> Another question is how should `align(n)` be generated. See
>> the following two:
>> 1) __attribute__((packed, aligned(n)))
>> 2) __attribute__((aligned(n)))
>> Note the missing `packed` between 1) and 2)
>> Currently (on GH) the entire generated output looks like this
>> #if defined(__GNUC__) || defined(__clang__)
>> __attribute__((packed, aligned(8)))
>> #elif defined(_MSC_VER)
>> #elif defined(__DMC__)
>> #pragma pack(push, 8)
>> /* fields */
>> #if defined(__DMC__)
>> #pragma pack(pop)
> This only covers structure packing rules, right? So alignment
> of the aggregate as a whole (equivalent to C++ alignas(n)
> statement) is out of scope?
> If so,
> #pragma pack(push,n)
> #pragma pack(pop,n)
> work on MSVC, GCC and clang in my experience. DMC is documented
> to have the same behavior. So you should be able to dispense
> with the #ifdef's completely.
I missed your reply. Sorry about that.
`#pragma pack(push/pop, n)` was initially used, but when testing
it didn't have the same behaviour as `__attribute__((packed,
aligned(n)))` so I ended up with the entire `#ifdef` tree above.
I could generate `alignas(n)` when the user compiles with
`-extern-std=c++11` and above, but I'm currently working on
correctly generating the ctors and dtors declarations.
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