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

[Gaetano Checinski via cfe-dev]

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>




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