Bug ID: 37122
           Summary: Lvalue reference types appear in the signature of
                    __builtin_va_start when compiled as C and targeting
           Product: clang
           Version: 6.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs

It seems that the signature of __builtin_va_start contains a C++ lvalue
reference type when targeting Windows, even when compiling as C:

$ cat t.c
void f(int n, ...) {
  __builtin_va_list v;
  __builtin_va_start(v, n);

$ clang --version
clang version 6.0.0 (tags/RELEASE_600/final)
Target: x86_64-unknown-linux-gnu

$ clang -c -Xclang -ast-dump -target x86_64-pc-windows-gnu t.c
`-FunctionDecl 0x4c89578 <col:3> col:3 implicit used __builtin_va_start 'void
(__builtin_va_list &, ...)' extern
  |-ParmVarDecl 0x4c89618 <<invalid sloc>> <invalid sloc> '__builtin_va_list &'
  `-NoThrowAttr 0x4c89680 <col:3> Implicit

Note the presence of '__builtin_va_list &' as a parameter type.

The lvalue reference is a surprise for AST consumers that do not expect to
encounter C++ reference types in code compiled as C.

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