Variable, foreign-functions package
Determines how the foreign interface will respond to a structure passed into def-foreign-call as an argument, or returned from the same in the returning keyword argument. This variable also affects the behavior of defun-foreign-callable. The argument or return value can be specified C style as by value (without a *) or by reference (with a *).
See Passing structures by value in foreign-functions.html for more information.
This variable can have the following values:
nil - structs passed by value are converted to pass-by-reference when seen, silently, as was the old behavior.
:warn - structs passed by value are converted to pass-by-reference when seen, and in addition a warning is issued. This is the initial value.
t - structs specified as passed by value are actually passed by value, making the interface consistent with C calling conventions.
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