bug 2474 and cxa_atexit

[Nathan Sidwell]

Hi,
bug 2474 concerns static object destruction ordering. That has
to be done in reverse order of constructor _completion_ [3.6.3]/1
The cxa_atexit API DTRT here, the non cxa_atexit algorithm gets it
wrong, as the bug report shows.

Will -fuse-cxa-atexit be enabled by default on the 3.0 branch?
Needless to say, this is an ABI issue. I have marked the bug
high priority.

nathan
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