[Bug stdio/18982] va_list and vprintf

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18982

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at sourceware dot org   |fweimer at redhat dot com

--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to joseph@codesourcery.com from comment #1)
> As specified in the x86_64 ABI, va_list is an array type on x86_64.  
> Thus, this is a documentation issue (failing to point out that when 
> va_list is an array type, it is passed by reference).

We could theoretically use va_copy in vprint and similar functions, and restore
it before returning.  But this has a performance impact, and I don't think it's
worth it.

So I'm in favor of a documentation change as well.

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