mirror of
https://github.com/wpilibsuite/allwpilib
synced 2026-06-23 01:21:42 +00:00
f84018af5f
During shared library loading, a different libLLVM can be pulled in, causing llvm symbols from dependent libraries to resolve to that library instead of this one. This has been seen in the wild with the Mesa OpenGL implementation in JavaFX applications (see wpilibsuite/shuffleboard#361). This is clearly a very breaking change. For some level of backwards compatibility, a namespace alias from llvm to wpi is performed in the "llvm" headers. Unfortunately, forward declarations of llvm classes will still break, but compilers seem to generate clear error messages in those cases ("namespace alias 'llvm' not allowed here, assuming 'wpi'"). This change also moves all the wpiutil headers to a single "wpi" subdirectory from the previously split "llvm", "support", "tcpsockets", and "udpsockets". Shim headers will be added for backwards compatibility in a later commit.
93 lines
2.6 KiB
C++
93 lines
2.6 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
|
|
|
|
#ifndef __has_feature
|
|
# define __has_feature(x) 0
|
|
#endif
|
|
|
|
#ifndef __has_extension
|
|
# define __has_extension(x) 0
|
|
#endif
|
|
|
|
#ifndef __has_attribute
|
|
# define __has_attribute(x) 0
|
|
#endif
|
|
|
|
#ifndef __has_builtin
|
|
# define __has_builtin(x) 0
|
|
#endif
|
|
|
|
/// \macro LLVM_GNUC_PREREQ
|
|
/// \brief Extend the default __GNUC_PREREQ even if glibc's features.h isn't
|
|
/// available.
|
|
#ifndef LLVM_GNUC_PREREQ
|
|
# if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
|
|
# define LLVM_GNUC_PREREQ(maj, min, patch) \
|
|
((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \
|
|
((maj) << 20) + ((min) << 10) + (patch))
|
|
# elif defined(__GNUC__) && defined(__GNUC_MINOR__)
|
|
# define LLVM_GNUC_PREREQ(maj, min, patch) \
|
|
((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
|
|
# else
|
|
# define LLVM_GNUC_PREREQ(maj, min, patch) 0
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef LLVM_CONSTEXPR
|
|
# ifdef _MSC_VER
|
|
# if _MSC_VER >= 1900
|
|
# define LLVM_CONSTEXPR constexpr
|
|
# else
|
|
# define LLVM_CONSTEXPR
|
|
# endif
|
|
# elif defined(__has_feature)
|
|
# if __has_feature(cxx_constexpr)
|
|
# define LLVM_CONSTEXPR constexpr
|
|
# else
|
|
# define LLVM_CONSTEXPR
|
|
# endif
|
|
# elif defined(__GXX_EXPERIMENTAL_CXX0X__)
|
|
# define LLVM_CONSTEXPR constexpr
|
|
# elif defined(__has_constexpr)
|
|
# define LLVM_CONSTEXPR constexpr
|
|
# else
|
|
# define LLVM_CONSTEXPR
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef LLVM_ATTRIBUTE_UNUSED_RESULT
|
|
#if __has_attribute(warn_unused_result) || LLVM_GNUC_PREREQ(3, 4, 0)
|
|
#define LLVM_ATTRIBUTE_UNUSED_RESULT __attribute__((__warn_unused_result__))
|
|
#elif defined(_MSC_VER)
|
|
#define LLVM_ATTRIBUTE_UNUSED_RESULT _Check_return_
|
|
#else
|
|
#define LLVM_ATTRIBUTE_UNUSED_RESULT
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef LLVM_UNLIKELY
|
|
#if __has_builtin(__builtin_expect) || LLVM_GNUC_PREREQ(4, 0, 0)
|
|
#define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
|
|
#define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
|
|
#else
|
|
#define LLVM_LIKELY(EXPR) (EXPR)
|
|
#define LLVM_UNLIKELY(EXPR) (EXPR)
|
|
#endif
|
|
#endif
|
|
|
|
#endif
|