[LLVMdev] exception handling broken on x86-64?

[Evan Cheng]

Where we are on the subject... Are we sure EH is done for x86?

These two tests have never worked on Mac OS X / x86:
SPEC/CINT2006/471.omnetpp
Shootout-C++/except

Evan

On Feb 9, 2008, at 2:57 PM, Dale Johannesen wrote:

>
> On Feb 9, 2008, at 2:48 PM, Anton Korobeynikov wrote:
>>> After comparing the generated assembler code with native gcc code I
>>> think the generated code is fine, just the exception handler info in
>>> the non-code sections is broken/missing.
>> It seems, that EH dwarf information emission is disabled in
>> X86TargetAsmInfo.cpp. Remove the is64Bit() condition near
>> "SupportExceptionHandling = true" line in X86Subtarget::isELF  
>> section.
>>
>> Also, don't forget to add --enable-eh switch to llc invocation.
>
> Just in case it doesn't work the first time:) patch 46029 might be
> helpful.  That made it work on Darwin for me, and it's possible some
> of the changes there are also applicable to Linux.  Compare your .s
> with g++ output.
>
>> You will need to link .S with your native unwinding runtime (so, use
>> g++
>> to link, not llvm-g++)
>
> This is not necessary on Darwin, btw, the unwinding stuff Just Worked
> too.
>
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