[RFC] Quad-float support in Fortran

[FX]

> -static-libgfortran:
> 
> * should *not* link with static libquad, since that's LGPL rather than 
> GPL+exception;

Yes.

> * should avoid a shared libquad dependency unless the program actually 
> uses the __float128 facilities.

I don't know how to do that. Unless we use a compiler flag, the driver has no way of knowing whether the program uses __float128, does it?

>> -- Namespace separation in libquad (math symbols will be exported as, 
>> e.g., acoshq, but the rest should be liquad_-prefixed)
> 
> The shared library should also use symbol versioning with an explicit map 
> showing the exact set of exported symbols.  Does it?

It does not, it should.

> Also, I think a name such as libquadmath was preferred over just libquad 
> (for the library at least, if not for the symbols).

> libgfortran.spec?  Or maybe this code isn't needed at all, if things 
> worked with the wrong name used?

Yes, it certainly looks that way.

FX