Should GDC remove internal dependency on stdarg?

[Iain Buclaw]

On 16 March 2012 10:34, Johannes Pfau <nospam at example.com> wrote:
> Am Mon, 12 Mar 2012 16:35:52 +0100
> schrieb "Iain Buclaw" <ibuclaw at ubuntu.com>:
>
>> I'm picking up some old issues from bugzilla, this one is worth
>> having a community review.
>>
>> http://d.puremagic.com/issues/show_bug.cgi?id=1949
>>
>>
>> Should hidden GCC features be imported from a magic module
>> provided by gcc.* packages - or should the implementation be
>> re-written using pragmas instead?
>
> I think I like the pragma approach more (as it allows auto-completion
> in IDEs and seems less 'magic'), but I don't have a strong opinion here.
>
>>
>> This is what LDC currently does (all of which would be possible
>> to do in GDC):
>> http://www.dsource.org/projects/ldc/wiki/Docs#Pragmas
>>
>>
>> Discuss. :)
>
>
> pragma(intrinsic) has the advantage that function declarations are
> available, so tools like visualD / mono-D can provide auto-completion
> for intrinsics. But maintaining all those pragma(intrinsics) is
> additional work, so I don't know if it's worth it. And what happens for
> intrinsics which are only supported on some architectures? version(ARM)
> + pragma(intrinsic)? I think that's too much work, especially as we
>  already have working intrinsics.
>

I don't think gcc intrinsics are worth thinking about changing, as I
think it's fine as is.  The only downside is gcc.builtins module is
empty from the user perspective, so they don't know what is and isn't
included when compiling.


> pragma(no_typeinfo/no_moduleinfo) sounds useful (Manu will probably
> like it ;-))
>
> pragma(alloca): I don't know if this is needed?
>
> pragma(allow_inline): As we don't support dmd-compatible inline
> asm anymore and gcc inline asm doesn't prevent inlining AFAIR, this
> pragma isn't needed with gdc?

I'm not so much interested in these as such.  The higher idea behind
the orginal topic really is to have a re-locatable implementation,
rather than saying you must 'import core.stdc.stdarg;' to use va args
properly, and lay this burden on extensive third party libraries that
are able to replace druntime and phobos altogether (ie: Tango is
possibly the only other).


-- 
Iain Buclaw

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