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49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
//===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines several macros, based on the current compiler. This allows
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// use of compiler-specific features in a way that remains portable.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_COMPILER_H
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#define LLVM_SUPPORT_COMPILER_H
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// The VISIBILITY_HIDDEN macro, used for marking classes with the GCC-specific
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// visibility("hidden") attribute.
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#if __GNUC__ >= 4
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#define VISIBILITY_HIDDEN __attribute__ ((visibility("hidden")))
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#else
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#define VISIBILITY_HIDDEN
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#endif
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// C++ doesn't support 'extern template' of template specializations. GCC does,
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// but requires __extension__ before it. In the header, use this:
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// EXTERN_TEMPLATE_INSTANTIATION(class foo<bar>);
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// in the .cpp file, use this:
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// TEMPLATE_INSTANTIATION(class foo<bar>);
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#ifdef __GNUC__
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#define EXTERN_TEMPLATE_INSTANTIATION(X) __extension__ extern template X
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#define TEMPLATE_INSTANTIATION(X) template X
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#else
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#define EXTERN_TEMPLATE_INSTANTIATION(X)
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#define TEMPLATE_INSTANTIATION(X)
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#endif
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// DISABLE_INLINE - On compilers where we have a directive to do so, mark a
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// method "not for inlining".
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#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
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#define DISABLE_INLINE __attribute__((noinline))
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#else
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#define DISABLE_INLINE
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#endif
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#endif
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