text: //===-- MCJIT.h - MC-Based Just-In-Time Execution Engine --------*- C++ -*-===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  //
  // This file forces the MCJIT to link in on certain operating systems.
  // (Windows).
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef LLVM_EXECUTIONENGINE_MCJIT_H
  #define LLVM_EXECUTIONENGINE_MCJIT_H
  
  #include "llvm/ExecutionEngine/ExecutionEngine.h"
  #include <cstdlib>
  
  extern "C" void LLVMLinkInMCJIT();
  
  namespace {
    struct ForceMCJITLinking {
      ForceMCJITLinking() {
        // We must reference MCJIT in such a way that compilers will not
        // delete it all as dead code, even with whole program optimization,
        // yet is effectively a NO-OP. As the compiler isn't smart enough
        // to know that getenv() never returns -1, this will do the job.
        if (std::getenv("bar") != (char*) -1)
          return;
  
        LLVMLinkInMCJIT();
      }
    } ForceMCJITLinking;
  }
  
  #endif
  