[swift-corelibs-dev] Duplicate definition of va_list on Arm

[Pierre Habouzit]

the include was added to dispatch specifically to allow dispatch_io to build on intel so your patch I think would break Intel.

I think the general problem is likely that glibc is not module friendly today.

-Pierre

> On Aug 19, 2016, at 11:53 AM, William Dillon via swift-corelibs-dev <swift-corelibs-dev at swift.org> wrote:
> 
> Hi all,
> 
> In corelibs-foundation project we've been using a patch based on https://github.com/apple/swift-corelibs-foundation/pull/399/files <https://github.com/apple/swift-corelibs-foundation/pull/399/files> for quite some time (summary: remove #include <stdio.h>).  The PR hasn't gotten any where for various reasons.  Currently, I've gotten libdispatch working on arm, but it requires a fix that's essentially identical.  It is part of a PR available here: https://github.com/apple/swift-corelibs-libdispatch/pull/155 <https://github.com/apple/swift-corelibs-libdispatch/pull/155>
> 
> I'd like to get this moving forward in both cases, and I'd like to bring it to the list.  What exactly is stdio.h bringing in?  I realize the comment identifies __off_t, but at least on arm that's being provided elsewhere.  Furthermore, __off_t is defined in several places.
> 
> Are there any suggestions for what a satisfactory solution would be to address the duplicate definition of va_list on arm that does not negatively impact other platforms?
> 
> Thanks,
> - Will
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