1 //===----- LinkAllIR.h - Reference All VMCore Code --------------*- 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 header file pulls in all the object modules of the VMCore library so 11 // that tools like llc, opt, and lli can ensure they are linked with all symbols 12 // from libVMCore.a It should only be used from a tool's main program. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #ifndef LLVM_LINKALLIR_H 17 #define LLVM_LINKALLIR_H 18 19 #include "llvm/BinaryFormat/Dwarf.h" 20 #include "llvm/IR/InlineAsm.h" 21 #include "llvm/IR/Instructions.h" 22 #include "llvm/IR/LLVMContext.h" 23 #include "llvm/IR/Module.h" 24 #include "llvm/IR/Verifier.h" 25 #include "llvm/Support/DynamicLibrary.h" 26 #include "llvm/Support/MathExtras.h" 27 #include "llvm/Support/Memory.h" 28 #include "llvm/Support/Mutex.h" 29 #include "llvm/Support/Path.h" 30 #include "llvm/Support/Process.h" 31 #include "llvm/Support/Program.h" 32 #include "llvm/Support/Signals.h" 33 #include <cstdlib> 34 35 namespace { 36 struct ForceVMCoreLinking { 37 ForceVMCoreLinking() { 38 // We must reference VMCore in such a way that compilers will not 39 // delete it all as dead code, even with whole program optimization, 40 // yet is effectively a NO-OP. As the compiler isn't smart enough 41 // to know that getenv() never returns -1, this will do the job. 42 if (std::getenv("bar") != (char*) -1) 43 return; 44 llvm::LLVMContext Context; 45 (void)new llvm::Module("", Context); 46 (void)new llvm::UnreachableInst(Context); 47 (void) llvm::createVerifierPass(); 48 } 49 } ForceVMCoreLinking; 50 } 51 52 #endif 53
