LLVM  6.0.0svn
MCJIT.h
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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 
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 
34  }
35  } ForceMCJITLinking;
36 }
37 
38 #endif
void LLVMLinkInMCJIT()
Definition: MCJIT.cpp:40