[LLVMdev] LLVM use of C++ exceptions and RTTI

[Duncan Sands]

Hi Francois,

> In that case, RTTI and exception should also be disabled from CMake
> generated projects right?
> Currently they are enabled all over my MSVC projects.

I'm not sure what you are asking.  The goal is for LLVM to not require
RTTI or exception handling.  Thus these can be disabled by the build
system (by specifying -fno-rtti etc), since they won't be used anyway.
Not disabling them won't break anything however.

Ciao,

Duncan.

>
> On Thu, Oct 14, 2010 at 3:57 AM, Duncan Sands<baldrick at free.fr>  wrote:
>> Hi Al,
>>
>>> It's good that llvm/lib builds with exceptions and RTTI disabled as it
>>> supports doing optimization and codegen on very constrained platforms.
>>> Judging by REQUIRES_EH in makefiles, only a few bits like TableGen, llvm-ar
>>> and llvm-ranlib need them, and I doubt these would need to run on a target.
>>> It's unlikely exceptions would get in in a random patch, because it would
>>> have to change the makefile; but even so, it would be useful to know that
>>> it's due to a definite design rule (assuming that's the case).
>>> Maybe this could be added to http://llvm.org/docs/CodingStandards.html ?
>>
>> yes, it's a definite design rule.  Can you please send a doc patch for
>> CodingStandards with some appropriate text in it.
>>
>> Thanks a lot,
>>
>> Duncan.
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