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//===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines several macros, based on the current compiler. This allows
// use of compiler-specific features in a way that remains portable.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_COMPILER_H
#define LLVM_SUPPORT_COMPILER_H
// The VISIBILITY_HIDDEN macro, used for marking classes with the GCC-specific
// visibility("hidden") attribute.
#if __GNUC__ >= 4
#define VISIBILITY_HIDDEN __attribute__ ((visibility("hidden")))
#else
#define VISIBILITY_HIDDEN
#endif
// C++ doesn't support 'extern template' of template specializations. GCC does,
// but requires __extension__ before it. In the header, use this:
// EXTERN_TEMPLATE_INSTANTIATION(class foo<bar>);
// in the .cpp file, use this:
// TEMPLATE_INSTANTIATION(class foo<bar>);
#ifdef __GNUC__
#define EXTERN_TEMPLATE_INSTANTIATION(X) __extension__ extern template X
#define TEMPLATE_INSTANTIATION(X) template X
#else
#define EXTERN_TEMPLATE_INSTANTIATION(X)
#define TEMPLATE_INSTANTIATION(X)
#endif
#endif
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