LLVM  10.0.0svn
OrcMCJITReplacement.h
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1 //===---- OrcMCJITReplacement.h - Orc-based MCJIT replacement ---*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file forces OrcMCJITReplacement to link in on certain operating systems.
10 // (Windows).
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_EXECUTIONENGINE_ORCMCJITREPLACEMENT_H
15 #define LLVM_EXECUTIONENGINE_ORCMCJITREPLACEMENT_H
16 
18 #include <cstdlib>
19 
20 extern "C" void LLVMLinkInOrcMCJITReplacement();
21 
22 namespace {
23  struct ForceOrcMCJITReplacementLinking {
24  ForceOrcMCJITReplacementLinking() {
25  // We must reference OrcMCJITReplacement in such a way that compilers will
26  // not delete it all as dead code, even with whole program optimization,
27  // yet is effectively a NO-OP. As the compiler isn't smart enough to know
28  // that getenv() never returns -1, this will do the job.
29  if (std::getenv("bar") != (char*) -1)
30  return;
31 
33  }
34  } ForceOrcMCJITReplacementLinking;
35 }
36 
37 #endif
void LLVMLinkInOrcMCJITReplacement()