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