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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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6
lib/Serialization/ModuleFileSharedCore.cpp
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@@ -198,6 +198,11 @@ static bool readOptionsBlock(llvm::BitstreamCursor &cursor,
case options_block::HAS_CXX_INTEROPERABILITY_ENABLED:
extendedInfo.setHasCxxInteroperability(true);
break;
case options_block::CXX_STDLIB_KIND:
unsigned rawKind;
options_block::CXXStdlibKindLayout::readRecord(scratch, rawKind);
extendedInfo.setCXXStdlibKind(static_cast<CXXStdlibKind>(rawKind));
break;
case options_block::ALLOW_NON_RESILIENT_ACCESS:
extendedInfo.setAllowNonResilientAccess(true);
break;
@@ -1461,6 +1466,7 @@ ModuleFileSharedCore::ModuleFileSharedCore(
extInfo.isAllowModuleWithCompilerErrorsEnabled();
Bits.IsConcurrencyChecked = extInfo.isConcurrencyChecked();
Bits.HasCxxInteroperability = extInfo.hasCxxInteroperability();
Bits.CXXStdlibKind = static_cast<uint8_t>(extInfo.getCXXStdlibKind());
Bits.AllowNonResilientAccess = extInfo.allowNonResilientAccess();
Bits.SerializePackageEnabled = extInfo.serializePackageEnabled();
MiscVersion = info.miscVersion;