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This warning diagnoses cases where an expression is compared to a constant, and the comparison is tautological due to the form of the expression (but not merely due to its type). This applies in cases such as comparisons of bit-fields and the result of bit-masks. The new warning is added to the Clang diagnostic group -Wtautological-constant-in-range-compare but not to the formerly-equivalent GCC-compatibility diagnostic group -Wtype-limits, which retains its old meaning of diagnosing only tautological comparisons to extremal values of a type (eg, int > INT_MAX). Reviewed By: rtrieu Differential Revision: https://reviews.llvm.org/D85256
//===----------------------------------------------------------------------===// // C Language Family Front-end //===----------------------------------------------------------------------===// Welcome to Clang. This is a compiler front-end for the C family of languages (C, C++, Objective-C, and Objective-C++) which is built as part of the LLVM compiler infrastructure project. Unlike many other compiler frontends, Clang is useful for a number of things beyond just compiling code: we intend for Clang to be host to a number of different source-level tools. One example of this is the Clang Static Analyzer. If you're interested in more (including how to build Clang) it is best to read the relevant web sites. Here are some pointers: Information on Clang: http://clang.llvm.org/ Building and using Clang: http://clang.llvm.org/get_started.html Clang Static Analyzer: http://clang-analyzer.llvm.org/ Information on the LLVM project: http://llvm.org/ If you have questions or comments about Clang, a great place to discuss them is on the Clang development mailing list: http://lists.llvm.org/mailman/listinfo/cfe-dev If you find a bug in Clang, please file it in the LLVM bug tracker: http://llvm.org/bugs/