Re: [Qemu-devel] [PULL 0/7] check-softfloat, fp-bench and clang compile fixes

["Alex Bennée" <alex.bennee@linaro.org>]

Emilio G. Cota <cota@braap.org> writes:

> On Thu, Jan 17, 2019 at 18:55:33 +0000, Peter Maydell wrote:
>> On Thu, 17 Jan 2019 at 18:30, Emilio G. Cota <cota@braap.org> wrote:
>> > What are the contents of "int-to-float.err"?
>>
>> linux1@lxub05:~$ cat qemu/build/all/tests/fp/int-to-float.err
>> >> Testing i32_to_f16, rounding near_even
>> 372 tests total.
>> 372 tests performed.
>> >> Testing i64_to_f16, rounding near_even
>> 756 tests total.
>> 756 tests performed.
>> >> Testing i32_to_f32, rounding near_even
>> 372 tests total.
>> 372 tests performed.
>> >> Testing i64_to_f32, rounding near_even
>> 756 tests total.
>> 756 tests performed.
>> >> Testing i32_to_f64
>> 372 tests total.
>> 372 tests performed.
>> >> Testing i64_to_f64, rounding near_even
>> 756 tests total.
>> 756 tests performed.
>> >> Testing i32_to_f128
>> 372 tests total.
>> 21 tests performed; 20 errors found.
>
> I see, so i32_to_f128 is failing on this host. Is there
> a s390x machine I could access? I don't see one in the
> gcc compile farm.

I've managed to reproduce this in a s390x VM, for Debian install runes:

  https://wiki.qemu.org/Documentation/Platforms/S390X#Debian_Install_Example_.28TCG.29

>
>> > diff --git a/tests/fp/Makefile b/tests/fp/Makefile
>> > index 5019dcdca0..5a35e7c210 100644
>> > --- a/tests/fp/Makefile
>> > +++ b/tests/fp/Makefile
>> > @@ -65,8 +65,7 @@ QEMU_CFLAGS += $(TF_OPTS)
>> >  TF_CFLAGS :=
>> >  TF_CFLAGS += -Wno-strict-prototypes
>> >  TF_CFLAGS += -Wno-unknown-pragmas
>> > -TF_CFLAGS += -Wno-discarded-qualifiers
>> > -TF_CFLAGS += -Wno-maybe-uninitialized
>> > +TF_CFLAGS += -Wno-uninitialized
>> >  TF_CFLAGS += -Wno-missing-prototypes
>> >  TF_CFLAGS += -Wno-return-type
>> >  TF_CFLAGS += -Wno-unused-function
>>
>> configure has logic to check whether it can use particular
>> warning enable/disable flags. Newer gcc (and I hope clang
>> but forget) will happily silently allow -Wno-random-new-thing
>> even if they don't support -Wrandom-new-thing) but I'm not
>> sure our minimum compiler version is yet new enough to
>> be able to rely on that (indeed the warning messages suggest
>> it is not).
>
> I figured that -Wno-unitialized is documented to work on both
> gcc and clang, and the change in testfloat drops the need
> for no-discarded-qualifiers, so we can go with this without
> messing with configure.

Works for me, OK with you Peter?

--
Alex Bennée