compnerd added a comment.
Snipping bits from `va_defs.h`:
#elif defined _M_ARM64
void __cdecl __va_start(va_list*, ...);
#define __crt_va_start_a(ap,v) ((void)(__va_start(&ap, _ADDRESSOF(v),
_SLOTSIZEOF(v), __alignof(v), _ADDRESSOF(v))))
...
#elif defined _M_X64
void __cdecl __va_start(va_list* , ...);
#define __crt_va_start_a(ap, x) ((void)(__va_start(&ap, x)))
...
This looks like a declaration to me. Although, this is in system headers, so
maybe we can ignore it by means of the system header suppression? The minor
problem with that is that clang-cl (and the clang driver with the windows
triple) do not support `-isystem` or `-isysroot` or `--sysroot` arguments. I
suppose that as long as we expose the cc1 option (I imagine that clang-cl will
pass the system paths appropriately), that is one option.
https://reviews.llvm.org/D45383
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