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

[Ohad Alali via cfe-dev]

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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