Egor Zhdan fec48f9e63 [cxx-interop] Synthesize a deprecated zero initializer for C++ structs ...

When importing a C header in the C++ language mode, Clang/Swift treat C structs as C++ structs.

Currently Swift synthesizes a default initializer that zero-initializes the backing memory of the struct for C structs, but not for C++ structs.

This is causing issues in existing projects that use C libraries and rely on having the default initializer available in Swift. This change enables the synthesis of a default initializer for C++ structs. Since many C++ structs are not designed to be initialized this way, the initializer is marked as deprecated in Swift.

rdar://109727620

2023-05-31 13:41:25 +01:00

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