------- Comment #7 from matz at suse dot de 2005-11-07 19:59 ------- Of course not. But unaware people trying trunk currently on distros which provided 3.4 or 4.0 will get non-obvious problems, and I'm not sure if that's a good idea (ignoring this problem 4.0 and trunk are nearly compatible, and 4.0 compiled programs work with the trunk libstc++, which has the same SOname like the 4.0 one). I think the only way to switch to the 'mt' allocator by default for the future without API issues would be to rename it to 'new', and not via some configure arguments.
Another reason is that this switching back of the default allocator is not forgotten when 4.1 branches, which I think is necessary anyway, so that 4.1 libs are compatible with 4.0 programs. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21072
