llvm dev - Oct 2010 - [LLVMdev] LLVM use of C++ exceptions and RTTI

Hi,

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 ?

Al

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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.

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

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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