RTEMS | confdefs.h fails to compile when included in C++20 source (#5145)

[Lucian Silistru (@lsilistr)]

Lucian Silistru commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5145#note_114411


One thing to note, it seems that, as a check, changing Atomic_Uint from SMP_ticket_lock_Control / Atomic_Ulong from struct Scheduler_Node to unsigned int / unsigned long long makes the error go away. All the atomic ops functions will also need to be changed to use integer math.

I used the preprocessor output of init.cc (added -E to iostream.yml cxxflags, init.cc.NN.o will contain preprocessor output; g++ requires this not end in .o to recompile).

Seems std::atomic<integral_type> default constructor is no longer trivial since C++20 and this may cause a chain reaction into the failing definitions.
https://en.cppreference.com/w/cpp/atomic/atomic/atomic

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5145#note_114411
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