1//===-- MCJIT.h - MC-Based Just-In-Time Execution Engine --------*- 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 the MCJIT to link in on certain operating systems. 10// (Windows). 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_EXECUTIONENGINE_MCJIT_H 15#define LLVM_EXECUTIONENGINE_MCJIT_H 16 17#include "llvm/ExecutionEngine/ExecutionEngine.h" 18#include <cstdlib> 19 20extern "C" void LLVMLinkInMCJIT(); 21 22namespace { 23 struct ForceMCJITLinking { 24 ForceMCJITLinking() { 25 // We must reference MCJIT in such a way that compilers will not 26 // 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 28 // to know that getenv() never returns -1, this will do the job. 29 if (std::getenv("bar") != (char*) -1) 30 return; 31 32 LLVMLinkInMCJIT(); 33 } 34 } ForceMCJITLinking; 35} 36 37#endif 38