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Re-order the way _OPSYS_INCLUDE_DIRS is calculated, and only perform checks for
the SDK path if we need to.
This avoids issues on Yosemite and Xcode 7, which drops support for the 10.10
SDK. Trying to determine the SDK path fails, but the failure is not cached in
the xcrun database, so each call to a compiler tool is unecessarily delayed (by
around 3 seconds on my build hosts).
For users still on Yosemite who have upgraded to Xcode 7, the solution is to
install the Command Line Tools so that /usr/include is populated and used.
the SDK path if we need to.
This avoids issues on Yosemite and Xcode 7, which drops support for the 10.10
SDK. Trying to determine the SDK path fails, but the failure is not cached in
the xcrun database, so each call to a compiler tool is unecessarily delayed (by
around 3 seconds on my build hosts).
For users still on Yosemite who have upgraded to Xcode 7, the solution is to
install the Command Line Tools so that /usr/include is populated and used.