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| author | Chris Lattner <sabre@nondot.org> | 2006-08-27 12:42:45 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-08-27 12:42:45 +0000 |
| commit | 0c0cc92762bdf34f26762eeaf66f6f8791428db5 (patch) | |
| tree | 94c211917fa8d7390983fd7717c9d8599a424e7c /include | |
| parent | 0b828e08f94459ac0046b864871d92fed4aaef7c (diff) | |
| download | llvm-0c0cc92762bdf34f26762eeaf66f6f8791428db5.tar.gz llvm-0c0cc92762bdf34f26762eeaf66f6f8791428db5.tar.bz2 llvm-0c0cc92762bdf34f26762eeaf66f6f8791428db5.tar.xz | |
New place to put compiler-specific functionality. This replaces Visibility.h,
and provides macros that can be used to make explicit instantiations of
template specializations, which is a gcc-specific feature.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29908 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
| -rw-r--r-- | include/llvm/Support/Compiler.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h new file mode 100644 index 0000000000..046033fb9e --- /dev/null +++ b/include/llvm/Support/Compiler.h @@ -0,0 +1,40 @@ +//===-- 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 |