[5.7-04182022][SymbolGraphGen] skip underscored implicit Clang decls #42497
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This is a cherry-pick of #42493 onto
release/5.7-04182022.Explanation: When generating symbol graphs for projects with a precompiled header and a minimum-access-level of
internal, several implicit Clang decls started appearing after #41156 stopped unanimously filtering out underscore-prefixed symbols. This PR filters out implicit Clang decls with underscore-prefixed names, as they're unlikely to be useful to consumers of symbol graphs.Scope: The change is isolated to SymbolGraphGen, and due to the behavior of underscored symbol filtering, should only affect symbol graphs where the minimum access level is set to
internalor below.Radar: rdar://92018648
Risk: Low. This won't affect normal compilation. The impact on symbol graphs is minimal; only implicit Clang decls in specific circumstances are filtered out.
Testing: A new lit test,
SymbolGraph/ClangImporter/BridgingHeader.swift, has been added to verify that using a precompiled header does not add three specific decls otherwise added by Clang.