[llvm-dev] Disabling Exception in LLVM

[Siddharth Shankar Swain via llvm-dev]

Yes mostly, Thanks for the quick answer.

On Tue, May 1, 2018 at 11:16 PM, Chris Bieneman <chris.bieneman at me.com>
wrote:

> LLVM does not allow the use of exceptions in our code. We do not allow
> throwing or catching them. That does not mean you cannot compile the code
> with exceptions enabled, it just means we don't use them.
>
> Clang is a full C++ compiler. Even though LLVM & Clang do not use
> exceptions in their implementation, Clang does support compiling C++ code
> that uses exceptions.
>
> Does this answer your question?
> -Chris
>
>
> On May 1, 2018, at 10:38 AM, Siddharth Shankar Swain <
> h2015096 at pilani.bits-pilani.ac.in> wrote:
>
> Hi Chris,
> Thanks for answering, Can u clarify on this comment mentioned in
> https://github.com/Z3Prover/z3/issues/861 .
>
>   cplusplus no exception support · Issue #861 · Z3Prover/z3 · GitHub
>
>    - LLVM's *source code* does not use exceptions for performance reasons
>    and so is compiled by default with -fno-exceptions. When using LLVM's
>    libraries via it's C++ interface it is important to match how LLVM was
>    built (i.e. do not mix code built with and without exception support).
>    - The Clang compiler which is built on top of LLVM is also compiled
>    without exceptions by default. However the built Clang can compile C++ code
>    with or without exceptions (using the -fno-exceptions). flag. Said
>    another way Clang's implementation doesn't use exceptions but Clang itself
>    can compile C++ code with or without exception support.
>
>
> Can anyone clarify on this comment ?
>
> Thanks,
> Siddharth
>
> On Tue, May 1, 2018 at 11:02 PM, Chris Bieneman <chris.bieneman at me.com>
> wrote:
>
>> Siddharth,
>>
>> I'm not sure what coding standards you refer to when you say "some C++
>> coding standard". This question is answered in the LLVM Coding Standards
>> document here:
>>
>> https://www.llvm.org/docs/CodingStandards.html#do-not-use-
>> rtti-or-exceptions
>>
>> As such LLVM's coding standards prohibit the use of exceptions and RTTI.
>>
>> -Chris
>>
>> On May 1, 2018, at 10:02 AM, Siddharth Shankar Swain via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>> Hi all,
>> Can anyone explain why exceptions are disabled in LLVM, even if some C++
>> coding standard tells to use exceptions ?
>> Thanks,
>> Siddharth
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>>
>>
>
>
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