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In the Unix ABI, `std::va_list` is defined as `typedef struct __va_list_tag { ... } va_list[1];`, which means that any `std::va_list` used as a function parameter decays to `struct __va_list_tag*`. Handling this actually made the QL code slightly cleaner. The only tricky bit is that we have to determine what type to use as the actual `va_list` type when loading, storing, or modifying a `std::va_list`. To do this, we look at the type of the argument to the `va_*` macro. A detailed QLDoc comment explains the details.
I added a test case for passing a `va_list` as an argument, and then manipulating that `va_list` in the callee.