On Mon, Feb 5, 2018 at 10:47 AM, Rainer Orth
<ro@cebitec.uni-bielefeld.de> wrote:
>
>> This patch to the Go frontend checks for negative numbers with very
>> small magnitudes that will round to negative zero, and forces them to
>> positive zero instead.  This implements the spec clarification in
>> https://golang.org/cl/14727.  The test is in
>> https://golang.org/cl/91895.  This fixes golang.org/issue/12621.
>> Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.  Committed
>> to mainline.
>
> unfortunately, this broke bootstrap with mpfr 2.4.2, which is still the
> minimum version documented in install.texi:

Bother.  Thanks for the note.  I've rolled back the patch, as follows.

Ian