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When an expression is instantiated, TreeTransform skips ImplicitCastExpr nodes, assuming they are recreated when the instantiated expression is built. It breaks functions that use non-default floating-point options, because they are kept in these ImplicitCastExprs. In this case the recreated ImplicitCastExpr takes FP options from the current Sema state and not from AST node. To fix this issue the FP options in Sema object are set when a compound statement is cloned in TreeTransform. This change fixes https://github.com/llvm/llvm-project/issues/64605 ([Regression 16 -> 17] Template instantiation ignores FENV_ACCESS being ON for both definition and instantiation). Differential Revision: https://reviews.llvm.org/D158158
//===----------------------------------------------------------------------===// // 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 forums: https://discourse.llvm.org/c/clang/ If you find a bug in Clang, please file it in the LLVM bug tracker: http://llvm.org/bugs/