Commits on Jul 1, 2020

1. ctypes: use the correct ABI for variadic functions …

   On arm64 the calling convention for variardic functions is different
   than the convention for fixed-arg functions of the same arg types.
   
   ctypes needs to use ffi_prep_cif_var to tell libffi which calling
   convention to use.
   
   This patch adds a new attribute "f.variadic" for ctypes function
   pointers, so users can specify which functions are variadic.
   
   It will also auto-detect varargs when a function is called with more
   arguments than f.argtypes specifies.   Since this is a new option
   and it only matters on arm64 on apple platforms, lots of existing code
   will not set f.variadic.   This will do the right thing in most
   situations.

   

   lawrence-danna-apple committed Jul 1, 2020
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