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a696d24ad2
--enable-expensive-checks allows the developer to enable runtime checking that can greatly increase compile time. Currently it only turns on _GLIBCXX_DEBUG. Other expensive debugging checks added later should be controlled by this configure option. This patch also updates llvm-config with a --cppflags option to inform llvm-gcc how to build itself so that it is compatible with an llvm that was built with _GLIBCXX_DEBUG. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37777 91177308-0d34-0410-b5e6-96231b3b80d8