include/llvm/CodeGen/LinkAllAsmWriterComponents.h

   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/CodeGen/BuiltinGCs.h"
  18 #include <cstdlib>
  19
  20 namespace {
  21   struct ForceAsmWriterLinking {
  22     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       if (std::getenv("bar") != (char*) -1)
  28         return;
  29
  30       llvm::linkOcamlGCPrinter();
  31       llvm::linkErlangGCPrinter();
  32
  33     }
  34   } ForceAsmWriterLinking; // Force link by creating a global definition.
  35 }
  36
  37 #endif // LLVM_CODEGEN_LINKALLASMWRITERCOMPONENTS_H