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 (closed)