DirectXShaderCompiler/include/llvm/ExecutionEngine/OrcMCJITReplacement.h

//===---- OrcMCJITReplacement.h - Orc-based MCJIT replacement ---*- 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 OrcMCJITReplacement to link in on certain operating systems.
// (Windows).
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_EXECUTIONENGINE_ORCMCJITREPLACEMENT_H
#define LLVM_EXECUTIONENGINE_ORCMCJITREPLACEMENT_H

#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include <cstdlib>

extern "C" void LLVMLinkInOrcMCJITReplacement();

namespace {
  struct ForceOrcMCJITReplacementLinking {
    ForceOrcMCJITReplacementLinking() {
      // We must reference OrcMCJITReplacement 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;

      LLVMLinkInOrcMCJITReplacement();
    }
  } ForceOrcMCJITReplacementLinking;
}

#endif