Upcoming ABI breaking changes

[lhmouse]

At the moment we have

mcfgthread/mcfgthread/gthr.h

Line 615 in 41f90e3

if(__thrd->__proc == __MCF_gthr_thread_thunk_v2)

I attempted to perform some type checking by comparing the thread procedure pointer with __MCF_gthr_thread_thunk_v2; but if mcfgthread is linked as a DLL this is actually a pointer to the import thunk function (note the absence of dllimport) and it is not be possible to get the result of a thread that is created from another module; and in 1.9 the operation fails.

I am afraid this cannot be fixed without issuing an ABI breaking change.

[lhmouse]

This is being blocked by Meson 1.7 now.