Merge "Fix TEMP_FAILURE_RETRY on non-GNU C++ dialects"

#define CONSTEXPR

#endif

/*

 * TEMP_FAILURE_RETRY is defined by some, but not all, versions of

 * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's

 * not already defined, then define it here.

 */

/* TEMP_FAILURE_RETRY is not available on macOS, but still useful there. */

#ifndef TEMP_FAILURE_RETRY

/* Used to retry syscalls that can return EINTR. */

#define TEMP_FAILURE_RETRY(exp) ({         \

    typeof (exp) _rc;                      \

#define TEMP_FAILURE_RETRY(exp)                \

    ({                                         \

        __typeof__(exp) _rc;                   \

        do {                                   \

            _rc = (exp);                       \

        } while (_rc == -1 && errno == EINTR); \

    _rc; })

        _rc;                                   \

    })

#endif

#if defined(_WIN32)