[cygwin patch] Enable Support for __float128 (TFmode) IEEE quad type

[Kai Tietz]

Hello Uros,

2009/5/29 David Billinghurst <dbcygwin@gmail.com>:
> Uros Bizjak wrote:
>>
>> Hello!
>>
>>> This patch enables support for the __float128 (TFmode) IEEE quad type in
>>> libgcc on cygwin.  It uses the same approach as for IA-32 on darwin.
>>>
>>> With this patch the tests gcc.dg/torture/fp-int-convert-float128*.c pass
>>> on cygwin.  Previously the tests failed to link.  See:
>>>  - http://gcc.gnu.org/ml/gcc-patches/2009-05/msg00959.html
>>>  - http://gcc.gnu.org/ml/gcc-patches/2009-05/msg01028.html
>>
>> soft-fp is added for other x86 targets in "miscellaneous part" of
>> config.gcc. Assuming that soft-fp also works for mingw (it is trivial to add
>> soft-fp nowadays ;), we can simply add:
>>
>>   i[34567]86-*-pe | i[34567]86-*-cygwin* | i[34567]86-*-mingw* |
>> x86_64-*-mingw*)
>>       tmake_file="${tmake_file} i386/t-fprules-softfp soft-fp/t-softfp"
>>
>> to the "miscellaneous part" of config.gcc.
>> i386/32/t-fprules-softfp actually filters out TImode conversions that are
>> not valid on x86_32. Please note, that there is no i386/64/t-fprules-softp.
>>>
>>> +       ;;
>>> +i[34567]86-*-mingw*)
>>> +       extra_parts="crtbegin.o crtend.o crtfastmath.o"
>>>        tmake_file="i386/t-cygming i386/t-crtfm"
>>>        ;;
>>>  x86_64-*-mingw*)
>>>
>> Please add windows targets to existing target groups. It will just work
>> out-of-the-box.
>>
>> I have attached (untested) patch that implements suggested approaches. I'm
>> not able to test it on windows targets. If it bootstraps OK for you, then it
>> is OK for mainline SVN. Technically, testsuite failures are all regressions,
>> but this patch enables new functionality on cygwin targets, so you will have
>> to discuss backport to 4.4 with cygwin maintainers.
>
> I have committed this for cygwin only.  I can't test the other targets.
>

I tested your suggested patch for i686-pc-mingw32 and for
x86_64-pc-mingw32 and it works. I would like to add this for mingw
targets, too..

Cheers,
Kai

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