Egor Zhdan bac5d0e9a1 [cxx-interop] Zero-initialize C++ structs when calling their default constructors ...

When Swift imports C structs, it synthesizes an initializer that takes no arguments and zero-initializes the C struct.

When C++ interop is enabled, Clang treats all C structs as if they were C++ structs. This means that some of the C structs will get a default constructor implicitly generated by Clang. This implicit default constructor will not zero-initialize trivial fields of the struct.

This is a common source of confusion and subtle bugs for developers who try to enable C++ interop in existing projects that use C interop and rely on zero-initialization of C structs.

rdar://115909532

2024-04-16 13:42:02 +01:00

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