Brad King c608000a2a Xcode: Work around xcodebuild spurious hangs in try_compile ...

`xcodebuild` occasionally hangs on some macOS machines (and can be
reproduced independent of CMake).  It only happens a few times in 1000
runs, but configuration of a large project calls `try_compile` many
times and therefore frequently hangs due to this problem.  I've been
unable to reproduce the hang when using a scheme to build, so always
generate a scheme in `try_compile` projects to work around the problem.

Issue: #16752

2017-05-15 13:05:46 -04:00

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