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       1             : //===- llvm/Codegen/LinkAllAsmWriterComponents.h ----------------*- 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 assembler writer related passes for tools like
      11             : // llc that need this functionality.
      12             : //
      13             : //===----------------------------------------------------------------------===//
      14             : 
      15             : #ifndef LLVM_CODEGEN_LINKALLASMWRITERCOMPONENTS_H
      16             : #define LLVM_CODEGEN_LINKALLASMWRITERCOMPONENTS_H
      17             : 
      18             : #include "llvm/CodeGen/GCs.h"
      19             : #include <cstdlib>
      20             : 
      21             : namespace {
      22             :   struct ForceAsmWriterLinking {
      23           0 :     ForceAsmWriterLinking() {
      24             :       // We must reference the plug-ins in such a way that compilers will not
      25             :       // delete it all as dead code, even with whole program optimization,
      26             :       // yet is effectively a NO-OP. As the compiler isn't smart enough
      27             :       // to know that getenv() never returns -1, this will do the job.
      28           0 :       if (std::getenv("bar") != (char*) -1)
      29           0 :         return;
      30             : 
      31           0 :       llvm::linkOcamlGCPrinter();
      32           0 :       llvm::linkErlangGCPrinter();
      33             : 
      34             :     }
      35             :   } ForceAsmWriterLinking; // Force link by creating a global definition.
      36             : }
      37             : 
      38             : #endif // LLVM_CODEGEN_LINKALLASMWRITERCOMPONENTS_H