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When targetting Windows, clang does not define __GNUC__, and as a result we don't use our attributes with it. This leads to warnings about unused functions that are already annotated with LLVM_ATTRIBUTE_UNUSED. Rather than testing for __clang__, we can use its __has_attribute and __has_builtin macros directlty. While I'm here, conditionally define and use __GNUC_PREREQ for gcc version checks. Spelling the check out with three comparisons is verbose and error prone. Reviewers: aaron.ballman Differential Revision: http://llvm-reviews.chandlerc.com/D1080 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185831 91177308-0d34-0410-b5e6-96231b3b80d8
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