STINNER Victor added the comment:
#define _Py_ONCE_VAR(var_decl, var) \
var_decl var = NULL;
static _Py_OnceVar var ## _once_meta = {.next = NULL, .obj_ref =
(PyObject **) &var}
Yeah, I had a similar idea, but I fear that it will increase the usage of the C
stack memory.
See the issue #28858: my old _PyObject_CallArg1() macro allocated an implicit
array on the stack and increased the stack usage, whereas the purpose of the
macro was to *reduce* the stack usage (just the opposite!). So I removed the
macro.
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<http://bugs.python.org/issue29881>
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