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ABI change on ILP32 platforms and relating to events. However it's harmless on little-endian ILP32 platforms in the sense that it doesn't cause breakages. Old ILP32 thread libraries write a 32-bit th_p and new thread libraries write a 64-bit th_p. But due to the fact that we have an unused 32-bit data field right after th_p and that field is always initialized to zero, little-endian ILP32 machines effectively have a valid 64-bit th_p by accident. Likewise for new thread libraries and old libthread_db: little endian ILP32 is unaffected. At this time we don't support big-endian threaded applications in GDB, so the breakage for the ILP32 case goes unnoticed.
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