1 //===- llvm/Codegen/LinkAllAsmWriterComponents.h ----------------*- 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 header file pulls in all assembler writer related passes for tools like 10 // llc that need this functionality. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_CODEGEN_LINKALLASMWRITERCOMPONENTS_H 15 #define LLVM_CODEGEN_LINKALLASMWRITERCOMPONENTS_H 16 17 #include "llvm/IR/BuiltinGCs.h" 18 #include <cstdlib> 19 20 namespace { 21 struct ForceAsmWriterLinking { ForceAsmWriterLinkingForceAsmWriterLinking22 ForceAsmWriterLinking() { 23 // We must reference the plug-ins in such a way that compilers will not 24 // delete it all as dead code, even with whole program optimization, 25 // yet is effectively a NO-OP. As the compiler isn't smart enough 26 // to know that getenv() never returns -1, this will do the job. 27 // This is so that globals in the translation units where these functions 28 // are defined are forced to be initialized, populating various 29 // registries. 30 if (std::getenv("bar") != (char*) -1) 31 return; 32 33 llvm::linkOcamlGCPrinter(); 34 llvm::linkErlangGCPrinter(); 35 36 } 37 } ForceAsmWriterLinking; // Force link by creating a global definition. 38 } 39 40 #endif // LLVM_CODEGEN_LINKALLASMWRITERCOMPONENTS_H 41