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CMake Nightly Date Stamp
XCode generator won't infinitely parse compiler flags (bug #13354).

When parsing the compiler flag list we reduce the search space on
each iteration to be the subset of the string we hadn't searched
before.
Merge topic 'xcode-duplicate-flags-13354' into next

f447db7 XCode generator won't infinitely parse compiler flags (bug #13354).
c482dd8 CMake Nightly Date Stamp
2b5459c CMake Nightly Date Stamp