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

William Dillon william at housedillon.com
Fri Aug 19 13:53:08 CDT 2016

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

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?

- Will
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