llvm dev - Mar 2015 - [LLVMdev] How can I get a copy of CompilerInstance, Sema and ASTContext ?

Hi all,
    I want to copy the value of ASTContext to a global variable, in function
clang::ParseAST(Sema &S, bool PrintStats, bool SkipFunctionBodies). But the
operator = is  defined as LLVM_DELETED_FUNCTION, so how can I realize the
assignment ?
Thanks.
Bo
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