[cfe-dev] lli: LLVM ERROR: Cannot select: X86ISD::WrapperRIP TargetGlobalTLSAddress:i64

[Mehdi Amini via cfe-dev]

+ LLVM-dev (clang is mostly about the frontend and this is a backend failure), you may have more change to get an answer.

> On Feb 6, 2017, at 5:49 AM, Gaetano Checinski via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> 
> Running the following code with clang++ -S -emit-llvm main.cpp && lli main.ll on Linux(Debian)
> 
> #include <future>
> 
> int main () {
>   return std::async([]{return 1;}).get();
> }
> fails to run on lli due to the following error:
> 
> LLVM ERROR: Cannot select: 0xd012e0: 
>      i64 = X86ISD::WrapperRIP TargetGlobalTLSAddress:i64<i8** @_ZSt15__once_callable> 0 [TF=10]
> 
>  0xd020c0: i64 = TargetGlobalTLSAddress<i8** @_ZSt15__once_callable> 0 [TF=10]
> In function: _ZSt9call_onceIMNSt13__future_base13_State_baseV2EFvPSt8functionIFSt10unique_ptrINS0_12_Result_baseENS4_8_DeleterEEvEEPbEJPS1_S9_SA_EEvRSt9once_flagOT_DpOT0_
> Questions:
> 
> What does it mean?
> 
> Are there any compiler-flags that fix this problem?
> 
> what specific features is libstdc++ using that cause this issue ?
> 
> How does my problem relate to Bug 21431 <https://mailtrack.io/trace/link/1fe0cd7f00b549701dad0d242b8ac56ba6ac935d?url=https%3A%2F%2Fllvm.org%2Fbugs%2Fshow_bug.cgi%3Fid%3D21431&signature=b9bd79ba0fa3ea59> ?
> 
> The motivation behind this questions is to understand the differences between libc++ and libstdc++ that leads to this specific error message (on Linux) in llvm's orcjit.
> 
> 
> 
> ps.: i've also asked this question in stackoverflow <https://mailtrack.io/trace/link/5ef1b8085238498016553e10c4722adcdedf5114?url=http%3A%2F%2Fstackoverflow.com%2Fquestions%2F42022864%2Flli-llvm-error-cannot-select-x86isdwrapperrip-targetglobaltlsaddressi64&signature=c79ed05ad376b570>
> 
> 
> 
>   <https://mailtrack.io/trace/link/4ee627efe1b4ec418e1a4460b533a6dc7f6f6799?url=https%3A%2F%2Fmailtrack.io%2F&signature=cce36b1562f1942b>Sent with Mailtrack <https://mailtrack.io/install?source=signature&lang=en&referral=gaetano.checinski@gmail.com&idSignature=22>_______________________________________________
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