Not sure what we can do about this but: #include <boost/shared_array.hpp> doesn't compile when Boost.TR1 is added to the include path. We've been through this before with shared_ptr.hpp and a solution was found, any chance of some magic here as well? The alternative is for all the shared_ptr/shared_array code to include <boost/config/no_tr1/memory.hpp> rather than <memory> directly. In fact the latter option is probably easier to maintain in the long run: the problem is sporadic, hard to reproduce (because it depends upon which headers are included and in which order), and even harder to track down :-( Sorry, but there ain't no easy way.... Thanks, John Here are the compiler errors: gcc-C++-action ../../../bin/boost/libs/tr1/test/std_test_boost.test/gcc/debug/st d_test_boost.o In file included from /cygdrive/c/data/boost/develop/boost/boost/tr1/memory.hpp: 56, from /cygdrive/c/data/boost/develop/boost/boost/tr1/tr1/memory: 28, from /cygdrive/c/data/boost/develop/boost/boost/detail/shared_c ount.hpp:32, from /cygdrive/c/data/boost/develop/boost/boost/shared_array.hp p:26, from /cygdrive/c/data/boost/develop/boost/libs/tr1/test/test_bo ost.cpp:10: /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:423: error: field `pn' has incomplete type /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr()': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:144: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(Y*)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:149: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:151: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:151: error: (Each unde clared identifier is reported only once for each function it appears in.) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(Y*, D)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:160: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:162: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(Y*, D, A)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:167: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:169: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In member function `b oost::shared_ptr<T>& boost::shared_ptr<T>::operator=(const boost::shared_ptr<T>& )': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:180: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(const boost::weak_ptr<Y>&)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:187: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(const boost::shared_ptr<Y>&)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:194: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(const boost::shared_ptr<Y>&, boost::detail::static_c ast_tag)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:199: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(const boost::shared_ptr<Y>&, boost::detail::const_ca st_tag)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:204: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(const boost::shared_ptr<Y>&, boost::detail::dynamic_ cast_tag)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:209: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:213: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(const boost::shared_ptr<Y>&, boost::detail::polymorp hic_cast_tag)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:218: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(std::auto_ptr<_Tp1>&)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:229: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:232: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In constructor `boost ::shared_ptr<T>::shared_ptr(Ap, typename boost::detail::sp_enable_if_auto_ptr<Ap , int>::type)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:239: error: class `boo st::shared_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:242: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In member function `b oost::shared_ptr<T>& boost::shared_ptr<T>::operator=(const boost::shared_ptr<Y>& )': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:257: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In member function `b ool boost::shared_ptr<T>::unique() const': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:385: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In member function `l ong int boost::shared_ptr<T>::use_count() const': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:390: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In member function `v oid boost::shared_ptr<T>::swap(boost::shared_ptr<T>&)': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:396: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In member function `b ool boost::shared_ptr<T>::_internal_less(const boost::shared_ptr<Y>&) const': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:401: error: `pn' undec lared (first use this function) /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp: In member function `v oid* boost::shared_ptr<T>::_internal_get_deleter(const std::type_info&) const': /cygdrive/c/data/boost/develop/boost/boost/shared_ptr.hpp:406: error: `pn' undec lared (first use this function) In file included from /cygdrive/c/data/boost/develop/boost/boost/tr1/memory.hpp: 57, from /cygdrive/c/data/boost/develop/boost/boost/tr1/tr1/memory: 28, from /cygdrive/c/data/boost/develop/boost/boost/detail/shared_c ount.hpp:32, from /cygdrive/c/data/boost/develop/boost/boost/shared_array.hp p:26, from /cygdrive/c/data/boost/develop/boost/libs/tr1/test/test_bo ost.cpp:10: /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: At global scope: /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:168: error: field `pn' h as incomplete type /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: In constructor `boost:: weak_ptr<T>::weak_ptr()': /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:39: error: class `boost: :weak_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: In constructor `boost:: weak_ptr<T>::weak_ptr(const boost::weak_ptr<Y>&)': /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:64: error: class `boost: :weak_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: In constructor `boost:: weak_ptr<T>::weak_ptr(const boost::shared_ptr<Y>&)': /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:70: error: class `boost: :weak_ptr<T>' does not have any field named `pn' /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: In member function `boo st::weak_ptr<T>& boost::weak_ptr<T>::operator=(const boost::weak_ptr<Y>&)': /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:80: error: `pn' undeclar ed (first use this function) /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: In member function `boo st::weak_ptr<T>& boost::weak_ptr<T>::operator=(const boost::shared_ptr<Y>&)': /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:88: error: `pn' undeclar ed (first use this function) /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: In member function `lon g int boost::weak_ptr<T>::use_count() const': /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:125: error: `pn' undecla red (first use this function) /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: In member function `boo l boost::weak_ptr<T>::expired() const': /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:130: error: `pn' undecla red (first use this function) /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: In member function `voi d boost::weak_ptr<T>::swap(boost::weak_ptr<T>&)': /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:141: error: `pn' undecla red (first use this function) /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: In member function `voi d boost::weak_ptr<T>::_internal_assign(T*, const boost::detail::shared_count&)': /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:147: error: `pn' undecla red (first use this function) /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp: In member function `boo l boost::weak_ptr<T>::_internal_less(const boost::weak_ptr<Y>&) const': /cygdrive/c/data/boost/develop/boost/boost/weak_ptr.hpp:152: error: `pn' undecla red (first use this function) "g++" -c -DTEST_STD_HEADERS=1 -g -O0 -fno-inline -Wall -ftemplate-depth-25 5 -I"/cygdrive/c/data/boost/develop/boost/boost/tr1/tr1" -I"/cygdrive/c/data/boo st/develop/boost" -I "/cygdrive/c/data/boost/develop/boost" -o "../../../bin/bo ost/libs/tr1/test/std_test_boost.test/gcc/debug/std_test_boost.o" "/cygdrive/c/d ata/boost/develop/boost/libs/tr1/test/test_boost.cpp"