| //===-- 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 |