Thomas Huth <th...@redhat.com> writes:
> On 27/05/2020 18.36, Alex Bennée wrote:
>>
>> Thomas Huth <th...@redhat.com> writes:
>>
>>> On 27/05/2020 16.44, Laurent Vivier wrote:
>>>> Le 25/05/2020 à 15:18, Thomas Huth a écrit :
>>>>> From: Alex Bennée <alex.ben...@linaro.org>
>>>>>
>>>>> Newer clangs rightly spot that you can never exceed the full address
>>>>> space of 64 bit hosts with:
>>>>>
>>>>> linux-user/elfload.c:2076:41: error: result of comparison 'unsigned
>>>>> long' > 18446744073709551615 is always false
>>>>> [-Werror,-Wtautological-type-limit-compare]
>>>>> 4685 if ((guest_hiaddr - guest_base) > ~(uintptr_t)0) {
>>>>> 4686 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~
>>>>> 4687 1 error generated.
>>>>>
>>>>> So lets limit the check to 32 bit hosts only.
>>>>>
>>>>> Fixes: ee94743034bf
>>>>> Reported-by: Thomas Huth <th...@redhat.com>
>>>>> Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
>>>>> [thuth: Use HOST_LONG_BITS < TARGET_ABI_BITS instead of HOST_LONG_BITS ==
>>>>> 32]
>>>>> Signed-off-by: Thomas Huth <th...@redhat.com>
>>>>> ---
>>>>> linux-user/elfload.c | 2 ++
>>>>> 1 file changed, 2 insertions(+)
>>>>>
>>>>> diff --git a/linux-user/elfload.c b/linux-user/elfload.c
>>>>> index 01a9323a63..ebc663ea0b 100644
>>>>> --- a/linux-user/elfload.c
>>>>> +++ b/linux-user/elfload.c
>>>>> @@ -2073,12 +2073,14 @@ static void pgb_have_guest_base(const char
>>>>> *image_name, abi_ulong guest_loaddr,
>>>>> exit(EXIT_FAILURE);
>>>>> }
>>>>> } else {
>>>>> +#if HOST_LONG_BITS < TARGET_ABI_BITS
>>>>> if ((guest_hiaddr - guest_base) > ~(uintptr_t)0) {
>>>>> error_report("%s: requires more virtual address space "
>>>>> "than the host can provide (0x%" PRIx64 ")",
>>>>> image_name, (uint64_t)guest_hiaddr -
>>>>> guest_base);
>>>>> exit(EXIT_FAILURE);
>>>>> }
>>>>> +#endif
>>>>> }
>>>>>
>>>>> /*
>>>>>
>>>>
>>>> Philippe sent the same patch:
>>>>
>>>> https://www.mail-archive.com/qemu-devel@nongnu.org/msg699796.html
>>>
>>> Indeed, but looking more closely, he's using slightly different
>>> locations for the #if and #endif ... not sure what's better though...?
>>
>> Richard was more inclined to suppress the warning:
>>
>> Subject: Re: [PATCH v2] linux-user: limit check to HOST_LONG_BITS == 32
>> From: Richard Henderson <richard.hender...@linaro.org>
>> Message-ID: <3069bc1b-115d-f361-8271-c775bf695...@linaro.org>
>> Date: Thu, 21 May 2020 20:15:51 -0700
>>
>> One reason I dropped the f32 patch from my last PR was because this
>> wasn't the only warning the latest clang picks up.
>
> ... but this is currently the only spot that is required to get the
> gitlab CI going again, so I think we should include this patch until we
> have a final decision whether to disable the warning or not (and we can
> still revert this patch after we disabled the warning). Ok?
I'm certainly happy with that if it gets gitlab working.
My experience with make docker-test-vlang@fedora (with 32) was there
where more things to fix. I guess gitlab didn't trigger them.
--
Alex Bennée
