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[cxx-interop] Support CxxStdlib overlay for libc++ on Linux

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This teaches Swift to rebuild the CxxStdlib overlay module from its interface when using a C++ standard library that is not the platform default, specifically libc++ on Linux.

rdar://138838506
This commit is contained in:
Egor Zhdan
2024-11-18 18:17:00 +00:00
parent c1ff2c3392
commit 282f3b127b
6 changed files with 40 additions and 10 deletions
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9
lib/Frontend/CompilerInvocation.cpp
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@@ -398,6 +398,15 @@ void CompilerInvocation::computeCXXStdlibOptions() {
LangOpts.CXXStdlib = toCXXStdlibKind(cxxStdlibKind);
LangOpts.PlatformDefaultCXXStdlib = toCXXStdlibKind(cxxDefaultStdlibKind);
}
if (!LangOpts.isUsingPlatformDefaultCXXStdlib()) {
// The CxxStdlib overlay was built for the platform default C++ stdlib, and
// its .swiftmodule file refers to implementation-specific symbols (such as
// namespace __1 in libc++, or namespace __cxx11 in libstdc++). Let's
// proactively rebuild the CxxStdlib module from its .swiftinterface if a
// non-default C++ stdlib is used.
FrontendOpts.PreferInterfaceForModules.push_back("CxxStdlib");
}
}
void CompilerInvocation::setRuntimeResourcePath(StringRef Path) {