File size: 3,938 Bytes
2a504a6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | #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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