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Currently, the precense of the OpenMP target declare metadata requires that we always codegen a global declaration. This is undesirable in the case that we could defer or omit this declaration as is common with unused extern variables. This is important as it allows us, in the runtime, to rely on static linking semantics to omit unused symbols so they are not included when the user links it in. This patch changes the check for always emitting these variables. Because of this we also need to extend this logic to the generation of the offloading entries. This has the result of derring the offload entry generation to the canonical definitoin. So we are effectively assuming whoever owns the storage for this variable will perform that operation. This makes an exception for `link` attributes as those require their own special handling. Let me know if this is sound in the implementation, I do not have the largest view of the standards here. Fixes: https://github.com/llvm/llvm-project/issues/64133 Reviewed By: tianshilei1992 Differential Revision: https://reviews.llvm.org/D156368 (cherry picked from commit 141c4e7a9403fed46d84c7f0429295bd28c89368)
//===----------------------------------------------------------------------===// // 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/