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brew doctor: add check for outdated compilers
A common source of build problems on Xcode 4.3+ is outdated compilers, usually when a user has installed over top of an old version and hasn't installed the CLT. Since the compilers from the previous Xcode are still around, brew doctor wouldn't complain. This adds a hash containing a list of the canonical compiler versions for supported versions of Xcode, and adds a check against that to determine whether a given installation has any compilers which are out of date. Closes #11518. Signed-off-by: Misty De Meo <firstname.lastname@example.org>
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