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6c3dc61e7e
catches uses of an extremely minor and widely-available C++ extension (which every C++ compiler I could find supports, but EDG and Clang reject in strict mode). The diagnosed code pattern looks like this: struct X { union { struct { int a; int b; } S; }; }; llvm-svn: 174103
See docs/CMake.html for instructions on how to build LLVM with CMake.