buildworld fails while building static clang library

[Ed Maste]

On 5 August 2017 at 16:16, Dimitry Andric <dim at freebsd.org> wrote:
>
> I remember there being an issue with ar and/or ranlib choking when the
> .a files become too big.  Ed, does that ring any bells?

Our ar (and ranlib, which is the same binary) will produce a corrupt
symbol table if the .a archive output is larger than 4GB, because we
support only 32-bit offsets in the older "/" symbol table format, not
the "/SYM64/" format and 64-bit offsets.

As with GNU ar from binutils 2.17.50 we silently truncate if the
offset does not fit in 32 bits. I'll have a patch for review soon to
exit on error rather than produce corrupted output, and hope to look
at adding /SYM64/ support later on.