[llvm-dev] HowToRunJIT doesn't work on windows 10 x64

[雷景然 via llvm-dev]

Hi All,


First, I want to show you a bug which I found at HowToUseJIT.cpp.


This is correct one, I changed locally:
----------------------------
  outs() << "We just constructed this LLVM module:\n\n" << *M;
  outs() << "\n\nRunning foo on : " << M->getTargetTriple();
  outs().flush();


  // Now we create the JIT.
  ExecutionEngine* EE = EngineBuilder(std::move(Owner)).create();

----------------------------


And then, the original version is :
----------------------------
  // Now we create the JIT.
  ExecutionEngine* EE = EngineBuilder(std::move(Owner)).create();


  outs() << "We just constructed this LLVM module:\n\n" << *M;
  outs() << "\n\nRunning foo on : " << M->getTargetTriple();
  outs().flush();


----------------------------


Because `Owner` is move into `EE`, and `M` is came from `Owner`, so the original version is incorrect.


I had change this locally. :)


Finally, My question is : why I got the error below when I ran the HowToUseJIT
-----------------------------------------
We just constructed this LLVM module:


; ModuleID = 'test'
source_filename = "test"
target triple = "x86_64-pc-windows-msvc"


define i32 @add1(i32 %AnArg) {
EntryBlock:
  %0 = add i32 1, %AnArg
  ret i32 %0
}


define i32 @foo() {
EntryBlock:
  %0 = tail call i32 @add1(i32 10)
  ret i32 %0
}






Running foo on : x86_64-pc-windows-msvc
LLVM ERROR: Target does not support MC emission!
Press any key to continue . . .

-----------------------------------------


My HowToUseJIT.cpp code is below:
--------------------------
int main() {
  ...
  M->setTargetTriple(sys::getDefaultTargetTriple());
  outs() << "We just constructed this LLVM module:\n\n" << *M;
  outs() << "\n\nRunning foo on : " << M->getTargetTriple();
  outs().flush();


  ForceMCJITLinking::ForceMCJITLinking();
  // Now we create the JIT.
  ExecutionEngine* EE = EngineBuilder(std::move(Owner)).create();


  // Call the `foo' function with no arguments:
  std::vector<GenericValue> noargs;
  GenericValue gv = EE->runFunction(FooF, noargs);

  ...
}
--------------------------




Best Regards.
Leagmain  (Jingran.Lear)
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