[PATCH] D123649: Allow flexible array initialization in C++.

[Eli Friedman via Phabricator via cfe-commits]

efriedma created this revision.
efriedma added reviewers: aaron.ballman, rsmith, erichkeane.
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Flexible array initialization is a C/C++ extension implemented in many compilers to allow initializing the flexible array tail of a struct type that contains a flexible array.  In clang, this is currently restricted to C. But this construct is used in the Microsoft SDK headers, so I'd like to extend it to C++.

For now, this doesn't handle dynamic initialization; probably not hard to implement, but it's extra code, and I don't think it's necessary for the expected uses.  And I'm not handling constant evaluation; it should fail gracefully.

I've added some additional code to assert that flexible array init works the way we expect it to in both C and C++.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123649

Files:
  clang/include/clang/AST/Decl.h
  clang/lib/AST/Decl.cpp
  clang/lib/CodeGen/CGDecl.cpp
  clang/lib/CodeGen/CodeGenModule.cpp
  clang/lib/Sema/SemaInit.cpp
  clang/test/CodeGenCXX/flexible-array-init.cpp
  clang/test/SemaCXX/constant-expression-cxx11.cpp

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