and see if this fixes the problem?
Which #include?
from /u/troy/boost-regressions/boost/boost/detail/sp_counted_impl.hpp:34,
_This_ #include.
BTW: I can't reproduce the problem here, but my Cygwin g++ is a bit old (3.4).
No that doesn't make any difference (I see the same errors): in order to make that fix work, you would have to stop shared_ptr.hpp weak_ptr.hpp and *all their dependents* from including <memory>. Which is basically what I was suggesting before (it stops the TR1 version being included anyway). My cygwin gcc is 3.4.4 and you can reproduce with: cd libs/tr1/test bjam std_test_random shared_ptr then gets included via the unit-test-suite and that triggers the error, strangely if I have a file that just includes shared_ptr directly it doesn't *seem* to trigger the problem (but I haven't tried that hard to boil down a test case). In any case the compiler is right to complain in this situation: it's just that *some* compilers take a more relaxed attitude to parsing templates, and don't seem to mind if some [non-template-] members are incomplete at the point the template is seen. John.