diff options
| -rw-r--r-- | src/main/cpp/util/port.h | 33 |
1 files changed, 28 insertions, 5 deletions
diff --git a/src/main/cpp/util/port.h b/src/main/cpp/util/port.h index 6cb9823121..ea5f560330 100644 --- a/src/main/cpp/util/port.h +++ b/src/main/cpp/util/port.h @@ -34,20 +34,43 @@ __attribute__((__format__ \ (__printf__, string_index, first_to_check))) -// -// Tell the compiler that a given function never returns -// -#define ATTRIBUTE_NORETURN __attribute__((noreturn)) #define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) #else // Not GCC #define PRINTF_ATTRIBUTE(string_index, first_to_check) -#define ATTRIBUTE_NORETURN #define ATTRIBUTE_UNUSED #endif // GCC +// HAVE_ATTRIBUTE +// +// A function-like feature checking macro that is a wrapper around +// `__has_attribute`, which is defined by GCC 5+ and Clang and evaluates to a +// nonzero constant integer if the attribute is supported or 0 if not. +// +// It evaluates to zero if `__has_attribute` is not defined by the compiler. +// +// GCC: https://gcc.gnu.org/gcc-5/changes.html +// Clang: https://clang.llvm.org/docs/LanguageExtensions.html +#ifdef __has_attribute +#define HAVE_ATTRIBUTE(x) __has_attribute(x) +#else +#define HAVE_ATTRIBUTE(x) (0) +#endif + +// ATTRIBUTE_NORETURN +// +// Tells the compiler that a given function never returns. +#if defined(SWIG) +#define ATTRIBUTE_NORETURN +#elif HAVE_ATTRIBUTE(noreturn) || (defined(__GNUC__) && !defined(__clang__)) +#define ATTRIBUTE_NORETURN __attribute__((noreturn)) +#else +#define ATTRIBUTE_NORETURN +#endif + + // Linux I/O priorities support is available only in later versions of glibc. // Therefore, we include some of the needed definitions here. May need to // be removed once we switch to a new version of glibc |