[llvm-bugs] [Bug 38959] New: use of clock_gettime() blocks build of xray on macOS 10.11 and less

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38959

            Bug ID: 38959
           Summary: use of clock_gettime() blocks build of xray on macOS
                    10.11 and less
           Product: XRay
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime
          Assignee: dberris at google.com
          Reporter: ken.cunningham.webuse at gmail.com
                CC: llvm-bugs at lists.llvm.org

clock_gettime() was added in macOS 10.12.

<https://stackoverflow.com/questions/5167269/clock-gettime-alternative-in-mac-os-x>

clock_gettime() is used in several instances in the xray runtime library, and
CLOCK_REALTIME is used but undefined on 10.11 and earlier, and so the build
fails on systems without this function and definition.

A possible replacement function is used in MacPorts for a similar failure in
other software:

<https://github.com/macports/macports-ports/blob/master/graphics/cogl/files/patch-clock_gettime.diff>

Another clock_gettime() replacement function with an MIT license is noted here
<https://gist.github.com/alfwatt/3588c5aa1f7a1ef7a3bb>

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