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Summary: The date-based approach to detecting unsupported versions of libstdc++ does not handle bug fix releases of older versions. As an example, the `__GLIBCXX__` value associated with version 5.1, `20150422`, is less than the values associated with versions 4.8.5 and 4.9.3. This patch adds secondary checks based on certain properties in sufficiently new versions of libstdc++. Reviewers: jfb, tstellar, rnk, sfertile, nemanjai Reviewed By: jfb Subscribers: mgorny, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D58682 llvm-svn: 355638
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