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Summary: According to C99 6.3.2.1p1, structs and unions with nested const-qualified fields (that is, const-qualified fields declared at some recursive level of the aggregate) are not modifiable lvalues. However, Clang permits assignments of these lvalues. With this patch, we both prohibit the assignment of records with const-qualified fields and emit a best-effort diagnostic. This fixes https://bugs.llvm.org/show_bug.cgi?id=31796 . Committing on behalf of bevinh (Bevin Hansson). Reviewers: rtrieu, rsmith, bjope Reviewed By: bjope Subscribers: Ka-Ka, rogfer01, bjope, fhahn, cfe-commits Differential Revision: https://reviews.llvm.org/D37254 llvm-svn: 313628
//===----------------------------------------------------------------------===// // 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/