1218885Sdim//===-- MCJIT.h - MC-Based Just-In-Time Execution Engine --------*- C++ -*-===// 2218885Sdim// 3353358Sdim// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4353358Sdim// See https://llvm.org/LICENSE.txt for license information. 5353358Sdim// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6218885Sdim// 7218885Sdim//===----------------------------------------------------------------------===// 8218885Sdim// 9218885Sdim// This file forces the MCJIT to link in on certain operating systems. 10218885Sdim// (Windows). 11218885Sdim// 12218885Sdim//===----------------------------------------------------------------------===// 13218885Sdim 14249423Sdim#ifndef LLVM_EXECUTIONENGINE_MCJIT_H 15249423Sdim#define LLVM_EXECUTIONENGINE_MCJIT_H 16218885Sdim 17218885Sdim#include "llvm/ExecutionEngine/ExecutionEngine.h" 18218885Sdim#include <cstdlib> 19218885Sdim 20218885Sdimextern "C" void LLVMLinkInMCJIT(); 21218885Sdim 22218885Sdimnamespace { 23218885Sdim struct ForceMCJITLinking { 24218885Sdim ForceMCJITLinking() { 25239462Sdim // We must reference MCJIT in such a way that compilers will not 26218885Sdim // delete it all as dead code, even with whole program optimization, 27218885Sdim // yet is effectively a NO-OP. As the compiler isn't smart enough 28218885Sdim // to know that getenv() never returns -1, this will do the job. 29218885Sdim if (std::getenv("bar") != (char*) -1) 30218885Sdim return; 31218885Sdim 32218885Sdim LLVMLinkInMCJIT(); 33218885Sdim } 34218885Sdim } ForceMCJITLinking; 35218885Sdim} 36218885Sdim 37218885Sdim#endif 38