[tor-bugs] #20235 [Core Tor]: Configure misidentifies clock_gettime and getentropy on macOS Sierra/XCode8 when compiling for iOS 8

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#20235: Configure misidentifies clock_gettime and getentropy on macOS Sierra/XCode8
when compiling for iOS 8
-------------------------------------------------+-------------------------
 Reporter:  rainwolf                             |          Owner:
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.2.9.x-final
Component:  Core Tor                             |        Version:  Tor:
                                                 |  0.2.8.8
 Severity:  Normal                               |     Resolution:
 Keywords:  Sierra, XCode 8, clock_gettime,      |  Actual Points:
  getentropy, libSystem.dylib 028-backport       |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by nickm):

 * keywords:  Sierra, XCode 8, clock_gettime, getentropy, libSystem.dylib =>
     Sierra, XCode 8, clock_gettime, getentropy, libSystem.dylib
     028-backport
 * milestone:   => Tor: 0.2.9.x-final


Comment:

 (#20241 is related to this, but not the same.)

 Does Apple provide a general way to target a specific version of their
 APIs, other than downgrading your developer tools?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20235#comment:1>
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