[llvm-dev] Optimizer issues on Windows

[David Majnemer via llvm-dev]

PR24374 has been fixed on trunk (r247435).

On Fri, Sep 11, 2015 at 8:07 AM, Reid Kleckner via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> The bug https://llvm.org/bugs/show_bug.cgi?id=24374 has to do with
> exceptions on Windows, so it is unrelated unless you are using them.
>
> On Fri, Sep 11, 2015 at 4:37 AM, Sebastian Blessing via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Dear Community,
>>
>> The ponyc <https://github.com/CausalityLtd/ponyc/tree/llvm37> (llvm37
>> branch) project is facing an issue on Windows:
>>
>> When optimizations are turned on (llvm 3.7.0-final and more specifically
>> <https://github.com/CausalityLtd/ponyc/blob/llvm37/src/libponyc/codegen/genopt.cc>,
>> opt-level 3,  BBVectorize, LoopVectorize, SLPVectorize, RerollLoops,
>> LoadCombine + a custom heap to stack pass) writing an object file aborts
>> (on Windows only) with the following fatal error:
>>
>> “Starting a function before ending the previous one!” at
>> MCStreamer.cpp:407 during LLVMTargetMachineEmitToFile. Verifying the IR
>> with llc raises no errors.
>>
>> What exact problem is being detected here and how can we get more details
>> on the location in the IR that is causing the problem?
>>
>> Turning off optimizations successfully writes the object file. This only
>> occurs on Windows, writing object files works fine on Linux and OS X.
>>
>> Is this a know issue with LLVM 3.7.0-final and how can this be fixed? Is
>> a patch required?
>>
>> This might be related to https://llvm.org/bugs/show_bug.cgi?id=24374.
>>
>> Kind regards
>> Sebastian
>>
>>
>>
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>>
>>
>
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