
The new attribute can be placed on statements in order to suppress arbitrary warnings produced by static analysis tools at those statements. Previously such suppressions were implemented as either informal comments (eg. clang-tidy `// NOLINT:`) or with preprocessor macros (eg. clang static analyzer's `#ifdef __clang_analyzer__`). The attribute provides a universal, formal, flexible and neat-looking suppression mechanism. Implement support for the new attribute in the clang static analyzer; clang-tidy coming soon. The attribute allows specifying which specific warnings to suppress, in the form of free-form strings that are intended to be specific to the tools, but currently none are actually supported; so this is also going to be a future improvement. Differential Revision: https://reviews.llvm.org/D93110
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