bitfields support in jextract

[John Rose]

Thanks for the useful links, Samuel.

> On Jun 30, 2018, at 12:26 AM, Samuel Audet <samuel.audet at gmail.com> wrote:
> 
> Hi,
> 
> Looks like the packing of bit fields is implementation dependent:
> https://stackoverflow.com/questions/1490092/c-c-force-bit-field-order-and-alignment
> 
> Clang is probably using GCC's extensions by default, but you should be thinking about supporting at least MSVC! GCC seems to have support for that with TARGET_MS_BITFIELD_LAYOUT_P:
> https://gcc.gnu.org/onlinedocs/gccint/Storage-Layout.html
> 
> Not sure about Clang though, nothing mentioned here:
> https://clang.llvm.org/docs/MSVCCompatibility.html
> 
> So, again, the scope of Panama is very ill defined. It would help if you could define it better. In the case of bit fields, it sounds like you will not be supporting any other bit-field layout than GCC/Clang..
> 
> Samuel
> 
>> On 06/30/2018 02:36 AM, Maurizio Cimadamore wrote:
>> Hi,
>> I'm sending this internally as an headsup...