[cxx-abi-dev] Mangling of calling convention attributes

[Jason Merrill]

On 05/18/2015 04:52 PM, Nick Lewycky wrote:
> On 6 May 2015 at 07:57, Jason Merrill <jason at redhat.com> wrote:
>> On 05/06/2015 08:49 AM, Richard Smith wrote:
>>
>>> The reason we chose Ua rather than U was that the ABI suggests that U4blah
>>> should demangle as 'blah', whereas we want something that demanglers know
>>> should become '__attribute__((blah))'. I have no particular strong
>>> feelings here.
>>
>> Hmm, I don't think this is a useful distinction; what matters is the
>> calling convention, not whether it was written with a GNU __attribute, a
>> C++11 [[attribute]], a decl-specifier, or whatever.
>
> The idea was to scope them, so Ua would be for attributes and we'd still
> have room for Uc for calling conventions if we want some day.

Yes, but why?  I don't see this scope as semantically meaningful, and 
mangling is expressing the signature of a function, not trying to encode 
the declaration syntax.

Jason