-feliminate-dwarf2-dups unusable?

[Benjamin Kosnik]

I've been experimenting with -gdwarf-2 -feliminate-dwarf2-dups in libstdc++. 
This combination of flags reduces the shared binary by 400k.

-g -O2
-rwxrwxr-x    1 bkoz     bkoz         4.0M libstdc++.so.5.0.2*

-gdwarf-2 -feliminate-dwarf2-dups -O2
-rwxrwxr-x    1 bkoz     bkoz         3.6M libstdc++.so.5.0.2*

The build and testsuite complete without incident, but then when I try to
debug, I get:

(gdb) file a.out
Reading symbols from a.out...DW_FORM_strp pointing outside of .debug_str section

This is with mainline gdb, and the dcarlton branch, with top-of-tree
gcc, on x86/linux.

Any ideas?

-benjamin