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/*
* Copyright 2009-2020 NVIDIA Corporation. All rights reserved.
*
* Licensed under the Apache License v2.0 with LLVM Exceptions.
* See https://llvm.org/LICENSE.txt for license information.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#ifndef __NVTX_LINKONCE_H__
#define __NVTX_LINKONCE_H__
/* This header defines macros to permit making definitions of global variables
* and functions in C/C++ header files which may be included multiple times in
* a translation unit or linkage unit. It allows authoring header-only libraries
* which can be used by multiple other header-only libraries (either as the same
* copy or multiple copies), and does not require any build changes, such as
* adding another .c file, linking a static library, or deploying a dynamic
* library. Globals defined with these macros have the property that they have
* the same address, pointing to a single instance, for the entire linkage unit.
* It is expected but not guaranteed that each linkage unit will have a separate
* instance.
*
* In some situations it is desirable to declare a variable without initializing
* it, refer to it in code or other variables' initializers, and then initialize
* it later. Similarly, functions can be prototyped, have their address taken,
* and then have their body defined later. In such cases, use the FWDDECL macros
* when forward-declaring LINKONCE global variables without initializers and
* function prototypes, and then use the DEFINE macros when later defining them.
* Although in many cases the FWDDECL macro is equivalent to the DEFINE macro,
* following this pattern makes code maximally portable.
*/
#if defined(__MINGW32__) /* MinGW */
#define NVTX_LINKONCE_WEAK __attribute__((section(".gnu.linkonce.0.")))
#if defined(__cplusplus)
#define NVTX_LINKONCE_DEFINE_GLOBAL __declspec(selectany)
#define NVTX_LINKONCE_DEFINE_FUNCTION extern "C" inline NVTX_LINKONCE_WEAK
#else
#define NVTX_LINKONCE_DEFINE_GLOBAL __declspec(selectany)
#define NVTX_LINKONCE_DEFINE_FUNCTION NVTX_LINKONCE_WEAK
#endif
#elif defined(_MSC_VER) /* MSVC */
#if defined(__cplusplus)
#define NVTX_LINKONCE_DEFINE_GLOBAL extern "C" __declspec(selectany)
#define NVTX_LINKONCE_DEFINE_FUNCTION extern "C" inline
#else
#define NVTX_LINKONCE_DEFINE_GLOBAL __declspec(selectany)
#define NVTX_LINKONCE_DEFINE_FUNCTION __inline
#endif
#elif defined(__CYGWIN__) && defined(__clang__) /* Clang on Cygwin */
#define NVTX_LINKONCE_WEAK __attribute__((section(".gnu.linkonce.0.")))
#if defined(__cplusplus)
#define NVTX_LINKONCE_DEFINE_GLOBAL NVTX_LINKONCE_WEAK
#define NVTX_LINKONCE_DEFINE_FUNCTION extern "C" NVTX_LINKONCE_WEAK
#else
#define NVTX_LINKONCE_DEFINE_GLOBAL NVTX_LINKONCE_WEAK
#define NVTX_LINKONCE_DEFINE_FUNCTION NVTX_LINKONCE_WEAK
#endif
#elif defined(__CYGWIN__) /* Assume GCC or compatible */
#define NVTX_LINKONCE_WEAK __attribute__((weak))
#if defined(__cplusplus)
#define NVTX_LINKONCE_DEFINE_GLOBAL __declspec(selectany)
#define NVTX_LINKONCE_DEFINE_FUNCTION extern "C" inline
#else
#define NVTX_LINKONCE_DEFINE_GLOBAL NVTX_LINKONCE_WEAK
#define NVTX_LINKONCE_DEFINE_FUNCTION NVTX_LINKONCE_WEAK
#endif
#else /* All others: Assume GCC, clang, or compatible */
#define NVTX_LINKONCE_WEAK __attribute__((weak))
#define NVTX_LINKONCE_HIDDEN __attribute__((visibility("hidden")))
#if defined(__cplusplus)
#define NVTX_LINKONCE_DEFINE_GLOBAL NVTX_LINKONCE_HIDDEN NVTX_LINKONCE_WEAK
#define NVTX_LINKONCE_DEFINE_FUNCTION extern "C" NVTX_LINKONCE_HIDDEN inline
#else
#define NVTX_LINKONCE_DEFINE_GLOBAL NVTX_LINKONCE_HIDDEN NVTX_LINKONCE_WEAK
#define NVTX_LINKONCE_DEFINE_FUNCTION NVTX_LINKONCE_HIDDEN NVTX_LINKONCE_WEAK
#endif
#endif
#define NVTX_LINKONCE_FWDDECL_GLOBAL NVTX_LINKONCE_DEFINE_GLOBAL extern
#define NVTX_LINKONCE_FWDDECL_FUNCTION NVTX_LINKONCE_DEFINE_FUNCTION
#endif /* __NVTX_LINKONCE_H__ */
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