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      1 //===-- MCJIT.h - MC-Based Just-In-Time Execution Engine --------*- 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 the MCJIT to link in on certain operating systems.
     11 // (Windows).
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #ifndef LLVM_EXECUTIONENGINE_MCJIT_H
     16 #define LLVM_EXECUTIONENGINE_MCJIT_H
     17 
     18 #include "llvm/ExecutionEngine/ExecutionEngine.h"
     19 #include <cstdlib>
     20 
     21 extern "C" void LLVMLinkInMCJIT();
     22 
     23 namespace {
     24   struct ForceMCJITLinking {
     25     ForceMCJITLinking() {
     26       // We must reference MCJIT in such a way that compilers will not
     27       // 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
     29       // to know that getenv() never returns -1, this will do the job.
     30       if (std::getenv("bar") != (char*) -1)
     31         return;
     32 
     33       LLVMLinkInMCJIT();
     34     }
     35   } ForceMCJITLinking;
     36 }
     37 
     38 #endif
     39