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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
49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
//===--- CXXStdlibKind.h ----------------------------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_CXX_STDLIB_KIND_H
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#define SWIFT_BASIC_CXX_STDLIB_KIND_H
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namespace swift {
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enum class CXXStdlibKind : uint8_t {
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Unknown = 0,
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/// libc++ is the default C++ stdlib on Darwin platforms. It is also supported
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/// on Linux when explicitly requested via `-Xcc -stdlib=libc++` flag.
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Libcxx = 1,
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/// libstdc++ is the default C++ stdlib on most Linux distributions.
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Libstdcxx = 2,
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/// msvcprt is used when targeting Windows.
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Msvcprt = 3,
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};
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inline std::string to_string(CXXStdlibKind kind) {
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switch (kind) {
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case CXXStdlibKind::Unknown:
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return "unknown C++ stdlib";
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case CXXStdlibKind::Libcxx:
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return "libc++";
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case CXXStdlibKind::Libstdcxx:
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return "libstdc++";
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case CXXStdlibKind::Msvcprt:
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return "msvcprt";
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}
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llvm_unreachable("unhandled CXXStdlibKind");
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}
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} // namespace swift
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#endif // SWIFT_BASIC_CXX_STDLIB_KIND_H
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