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       1             : //===---- OrcMCJITReplacement.h - Orc-based MCJIT replacement ---*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file forces OrcMCJITReplacement to link in on certain operating systems.
      11             : // (Windows).
      12             : //
      13             : //===----------------------------------------------------------------------===//
      14             : 
      15             : #ifndef LLVM_EXECUTIONENGINE_ORCMCJITREPLACEMENT_H
      16             : #define LLVM_EXECUTIONENGINE_ORCMCJITREPLACEMENT_H
      17             : 
      18             : #include "llvm/ExecutionEngine/ExecutionEngine.h"
      19             : #include <cstdlib>
      20             : 
      21             : extern "C" void LLVMLinkInOrcMCJITReplacement();
      22             : 
      23             : namespace {
      24             :   struct ForceOrcMCJITReplacementLinking {
      25           0 :     ForceOrcMCJITReplacementLinking() {
      26             :       // We must reference OrcMCJITReplacement in such a way that compilers will
      27             :       // not delete it all as dead code, even with whole program optimization,
      28             :       // yet is effectively a NO-OP. As the compiler isn't smart enough to know
      29             :       // that getenv() never returns -1, this will do the job.
      30           0 :       if (std::getenv("bar") != (char*) -1)
      31           0 :         return;
      32             : 
      33           0 :       LLVMLinkInOrcMCJITReplacement();
      34             :     }
      35             :   } ForceOrcMCJITReplacementLinking;
      36             : }
      37             : 
      38             : #endif