[RFC PATCH] Optionally use -mlong-double-128 by default on {powerpc{,64},s390{,x},sparc,alpha}-linux

[Mark Mitchell]

Benjamin Kosnik wrote:
>> For
>>libstdc++, my (unexpert) approach would just be to bump the SONAME, in
>>part because I'd have a hard time being sure that anything else was
>>really safe, and in part because the more magic we stuff into the
>>exports file, the harder it is to be sure that everything we do in
>>future will still work.
> 
> SONAME 7 has been in progress for some time: there will be no "bumping"
> of the SONAME in mainline, but instead a merge of libstdcxx_so_7-branch. 

Sure, I meant in addition to that change, or as part of that change, or
as a traditional multilib.  I'm just fearful that making this long
double change will somehow introduce either an incompatibility (in that
old 64-bit long double binaries stop working with the new library), or a
bug (in that new 128-bit long double binaries don't work correctly).

Like I said, an unexpert opinion; I wasn't trying to dictate anything.

-- 
Mark Mitchell
CodeSourcery
mark@codesourcery.com
(650) 331-3385 x713