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 18 #include "llvm/ExecutionEngine/ExecutionEngine.h" 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 33 LLVMLinkInMCJIT(); 34 } 35 } ForceMCJITLinking; 36 } 37 38 #endif 39
