Recent libstdc++ regression on i686-linux: abi/cxx_runtime_only_linkage.cc

[Paolo Carlini]

H.J. Lu wrote:
> /export/gnu/import/svn/gcc-test/bld/x86_64-unknown-linux-gnu/32/libstdc++-v3/libsupc++/.libs/libsupc++.a(eh_throw.o):
> In function `__exchange_and_add_dispatch':^M
> /export/gnu/import/svn/gcc-test/bld/x86_64-unknown-linux-gnu/32/libstdc++-v3/include/ext/atomicity.h:84:
> undefined reference to `__gnu_cxx::__exchange_and_add(int volatile*,
> int)'^M
Thanks HJ. Essentially, is again the same annoying issue: this test 
fails on i686-linux (not x86_64-linux, of course) because currently 
libsupc++  depends on libstdc++ to export __exchange_and_add... We have 
to find a way to decouple the two, or maybe just provide the C++0x 
exception propagation only on targets supporting the atomic builtins. 
Probably the latter, barring better ideas, because I'm really fed up 
with this atomic builtins story, frankly...

Paolo.