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Re: Darwin bootstrap failure following wide int merge (was: we are starting the wide int merge)


On Mon, May 26, 2014 at 1:14 AM, FX <fxcoudert@gmail.com> wrote:
>> > .././../gcc-4.10-20140518/gcc/wide-int.cc:1274:23: error: invalid use of a
>> > cast in a inline asm context requiring an l-value: remove the cast or
>> > build with -fheinous-gnu-extensions
>> >           umul_ppmm (val[1], val[0], op1.ulow (), op2.ulow ());
>> >           ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> This is PR 61146.  You can get around it by adding -fheinous-gnu-extensions
>> to BOOT_CFLAGS.
>
> This causes GCC bootstrap to fail on Darwin systems (whose system compiler is clang-based). Since PR 61146 was resolved as INVALID (but Iâm not sure itâs the right call, see below), Iâve filed a separate report for the bootstrap issue (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61315).
>
> Regarding PR 61146, I agree with Marc Glisse (comment #3) that the casts in question look weird and should probably be removed, as was done in GMP. This code should be cleaned up, and it will fix bootstrap on clang-based target coincidentally, without adding another kludge.
>

I think that posting a patch is probably the best bet. Then the
various merits of the patch to clean up the code can be argued. As far
as some sort of workaround, I'd suggest seeing if there's something
else that can be done first.

Thanks.

-eric


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