[llvm-dev] Optimizer issues on Windows

[Sebastian Blessing via llvm-dev]

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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