[fortran,patch] Complete front-end support for __float128

[Richard Guenther]

On Thu, Aug 26, 2010 at 4:39 PM, FX <fxcoudert@gmail.com> wrote:
> So, this is my patch for full front-end support for __float128 in gfortran. What remains to be done here, and what this patch does, is:
>
>  -- add the knowledge of this type to the front-end (new gfc_real_info member, for example)
>  -- allow the user to enable it, with a new option -fsoft-float
>  -- allow the front-end to generate correct function calls for intrinsics: use builtins for float, double and long double, and build external function decls for __float128 functions
>
> I think the patch is rather small. It is very low-risk, as everything new is hidden behind the new option (whose name may be too close to -msoft-float, which has a totally different meaning; I have no better idea). To be sure, I regtested everything on x86_64-linux, both with -m32 and -m64, and both with -msoft-float and without. I found only one test that needed to be adjusted (random_seed_1.f90 wasn't taking into account the possibility of the compiler having both real(kind=10) and real(kind=16)).

Why do you need a flag at all?  Simply support real(kind=16).
And why should having both real(kind=10) and real(kind=16) be a problem?

Richard.