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[cxx-interop] Allow compiling with libc++ on Linux

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This makes sure that Swift respects `-Xcc -stdlib=libc++` flags.

Clang already has existing logic to discover the system-wide libc++ installation on Linux. We rely on that logic here.

Importing a Swift module that was built with a different C++ stdlib is not supported and emits an error.

The Cxx module can be imported when compiling with any C++ stdlib. The synthesized conformances, e.g. to CxxRandomAccessCollection also work. However, CxxStdlib currently cannot be imported when compiling with libc++, since on Linux it refers to symbols from libstdc++ which have different mangled names in libc++.

rdar://118357548 / https://github.com/swiftlang/swift/issues/69825
This commit is contained in:
Egor Zhdan
2024-07-30 20:01:58 +01:00
parent 536a88971f
commit 059f0f97d1
31 changed files with 348 additions and 28 deletions
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1
lib/AST/Module.cpp
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@@ -725,6 +725,7 @@ ModuleDecl::ModuleDecl(Identifier name, ASTContext &ctx,
Bits.ModuleDecl.IsConcurrencyChecked = 0;
Bits.ModuleDecl.ObjCNameLookupCachePopulated = 0;
Bits.ModuleDecl.HasCxxInteroperability = 0;
Bits.ModuleDecl.CXXStdlibKind = 0;
Bits.ModuleDecl.AllowNonResilientAccess = 0;
Bits.ModuleDecl.SerializePackageEnabled = 0;
}