[cfe-dev] Wframe-larger-than flag bug

[Ohad Alali via cfe-dev]

Just to clarify, I cannot use flags -Wframe-larger-than, -Werror and
-save-temps=obj and get error instead of warning. right?

‫בתאריך יום א׳, 26 בינו׳ 2020 ב-8:35 מאת ‪Ohad Alali‬‏ <‪
ohad.alali at gmail.com‬‏>:‬

> Thanks
>
> ‫בתאריך יום א׳, 26 בינו׳ 2020 ב-5:56 מאת ‪David Blaikie‬‏ <‪
> dblaikie at gmail.com‬‏>:‬
>
>> Ah, right, sorry I didn't reproduce your steps exactly - thanks for
>> highlighting the save-temps aspect.
>>
>> Yeah, testing this with clang trunk (which, on godbolt, is built with
>> assertions enabled) this crashes the compiler. Something about
>> frame-larger-than doesn't work with save-temps, which doesn't super
>> surprise me, -Wframe-larger-than with -fsyntax-only doesn't produce any
>> warning (frame-larger-than is implemented in the code generation pipeline,
>> as much as we try to avoid doing that for warnings in clang, this one's an
>> exception).
>>
>>
>> On Sat, Jan 25, 2020 at 2:15 PM Ohad Alali <ohad.alali at gmail.com> wrote:
>>
>>> Thanks for your response.
>>> I've opened your link and it's seems that clang (trunk) is not handle
>>> the flag -save-temps=obj. compilation with -save-temps:
>>> https://godbolt.org/z/-neaMs
>>> When changing the compiler to clang v0.8, same behaviour as describe
>>> before.
>>> with flag -save-temps=obj: https://godbolt.org/z/gzpFGD
>>> without flag -save-temps=obj: https://godbolt.org/z/5uABvL
>>>
>>> Thanks,
>>> Ohad
>>>
>>>
>>>
>>> ‫בתאריך שבת, 25 בינו׳ 2020 ב-8:16 מאת ‪David Blaikie‬‏ <‪
>>> dblaikie at gmail.com‬‏>:‬
>>>
>>>> Works for me: https://godbolt.org/z/kMijQ7
>>>>
>>>> On Sun, Jan 5, 2020 at 6:45 AM Ohad Alali via cfe-dev <
>>>> cfe-dev at lists.llvm.org> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I'm compiling my project with clang version 7.0.0-3.
>>>>> I added compilation flag frame-larger-than in order to warning using
>>>>> more than 1024 bytes.
>>>>>
>>>>> clang indeed warning as expected, but when I added -Werror in order to
>>>>> treat the warning as error clang ignore this flag and it stays warning.
>>>>>
>>>>> the compilation flags include also save-temps=obj, when I remove this
>>>>> flag the warning treated as error.
>>>>>
>>>>> Does save-temps flag should be related to -Werror or
>>>>> -Wframe-larger-than?
>>>>>
>>>>> full compilation flags:
>>>>> clang++-7 -D_SYS_LINUX_ -D_HOSTSYS_LINUX_ -D_CPU_  -D_SYS64_ -D_DEBUG_
>>>>> -O2  -Wframe-larger-than=1024 -MD -Wall -save-temps=obj -Wextra -Wshadow
>>>>> -Werror -g -ggdb -fPIC
>>>>>
>>>>> Thanks,
>>>>> Ohad
>>>>> _______________________________________________
>>>>> cfe-dev mailing list
>>>>> cfe-dev at lists.llvm.org
>>>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>>>>>
>>>>
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