llvm-6502/include/llvm/Support/Compiler.h
Anton Korobeynikov 476527a19d Symbol visibility is unsupported on cygwin too.
Patch by Jay Foad!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58520 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-31 18:05:01 +00:00

54 lines
1.8 KiB
C++

//===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file 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) && !defined(__MINGW32__) && !defined(__CYGWIN__)
#define VISIBILITY_HIDDEN __attribute__ ((visibility("hidden")))
#else
#define VISIBILITY_HIDDEN
#endif
#if (__GNUC__ >= 4)
#define ATTRIBUTE_USED __attribute__((__used__))
#else
#define ATTRIBUTE_USED
#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
// DISABLE_INLINE - On compilers where we have a directive to do so, mark a
// method "not for inlining".
#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
#define DISABLE_INLINE __attribute__((noinline))
#else
#define DISABLE_INLINE
#endif
#endif