about libstdc++ ,change the defaule allocator

[Jiandong Lu]

hello,everyone.
     I get the current source code from svn,and successfully build world.
     c++'s standard library is from gnu. This library privodes many allocators: 
bitmap_allocator_base
malloc_allocator_base
mt_allocator_base
new_allocator_base
pool_allocator_base
I want to know how to set a default allocator,and how to change it.

I have read the Makefile:
/usr/src/gnu/lib/libstdc++/Makefile

Thanks.



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