LLVM  6.0.0svn
OrcMCJITReplacement.h
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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 
19 #include <cstdlib>
20 
21 extern "C" void LLVMLinkInOrcMCJITReplacement();
22 
23 namespace {
24  struct ForceOrcMCJITReplacementLinking {
25  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  if (std::getenv("bar") != (char*) -1)
31  return;
32 
34  }
35  } ForceOrcMCJITReplacementLinking;
36 }
37 
38 #endif
void LLVMLinkInOrcMCJITReplacement()