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Description
Description
SwiftPM currently passes cCompiler extraCLIFlags to swiftc when building a swift target by prefixing the arguments with -Xcc. This is useful as it ensures the clang-importer and clang itself to build C targets with the same set of flags.
A similar need exists for the clang-importer and clang++. They should use the same set of flags. This however is not yet possible as swiftc does have a -Xcxx flag which could prefix the cxxCompiler extraCLIFlags. The -Xcc prefix also cannot be used as c++ flags cannot all safely be passed to clang (in C mode).
Once swiftc supports -Xcxx spm should adopt it and pass cxxCompiler extraCLIFlags to swiftc.