Hello, I made another changes to the library source to make it works on my test platform (Linux.x86, gcc-3.3.4 and gcc-3.4.1) : The library compiles well with gcc-3.3.4, but gcc-3.4.1 needs some help to find the 'read' and 'write' functions: In file included from /Boost/src/boost/boost/io/zlib.hpp:19, from /Boost/src/boost/libs/io/build/../src/zlib.cpp:11: /Boost/src/boost/boost/io/symmetric_filter_adapter.hpp: In member function `streamsize boost::io::detail::symmetric_filter_adapter_impl< SymmetricFilter, Alloc >::read(Source &, typename boost::io::char_type<T>::type *, streamsize )': /Boost/src/boost/boost/io/symmetric_filter_adapter.hpp:93: error: `read' is not a member of `boost::io' Same error for `write' on lines 110 and 160. The missing fuctions are defined in the header operations.hpp, which is not included. (see operations-hpp.patch) The inclusions of the headers gives another problem: In file included from /Boost/src/boost/boost/io/symmetric_filter_adapter.hpp:44, from /Boost/src/boost/boost/io/zlib.hpp:19, from /Boost/src/boost/libs/io/build/../src/zlib.cpp:11: /Boost/src/boost/boost/io/operations.hpp: In static member function `static void boost::io::detail::read_impl< boost::io::input >::putback(T &, typename boost::io::char_type<T>::type)': /Boost/src/boost/boost/io/operations.hpp:102: error: invalid application of `sizeof' to incomplete type `boost::STATIC_ASSERTION_FAILURE< false>' I don't understand why this assertion fails (but I didn't tried to ;) so I changed it to true... The lib is now ready to be linked against, let's see some example programs: To compile the bzip2 example (doc section 5.9.3.3) with gcc-3.4.1, you need to define the macro BOOST_IO_NO_FULL_SMART_ADAPTER_SUPPORT (gcc-3.3.4 does not need it). Without this macro you get the following errors: In file included from /Boost/stow/boost- 1.32.0/include/boost-1_32/boost/io/detail/push.hpp:12, from /Boost/stow/boost-1.32.0/include/boost- 1_32/boost/io/detail/chain.hpp:23, from /Boost/stow/boost-1.32.0/include/boost- 1_32/boost/io/filtering_streambuf.hpp:17, from simple_bzcat.cpp:4: /Boost/stow/boost-1.32.0/include/boost-1_32/boost/io/detail/resolve.hpp:34: error: non-template `result_type' used as template /Boost/stow/boost-1.32.0/include/boost-1_32/boost/io/detail/resolve.hpp:34: note: use `U::template result_type' to indicate that it is a template /Boost/stow/boost-1.32.0/include/boost-1_32/boost/io/detail/resolve.hpp:34: error: expected `{' before ';' token The two builds of the program run as expected. The gzip example (doc section 5.9.3.2) fails (using gcc-3.3.4 or gcc-3.4.1) with the errors : In file included from simple_gzcat.cpp:6: /Boost/stow/boost-1.32.0/include/boost-1_32/boost/io/gzip.hpp:88: error: expected unqualified-id before numeric constant /Boost/stow/boost-1.32.0/include/boost-1_32/boost/io/gzip.hpp:88: error: expected `, ' or `;' before numeric constant /Boost/stow/boost-1.32.0/include/boost-1_32/boost/io/gzip.hpp:145: error: declaration of `int boost::io::gzip_error::zlib_error() const' /Boost/stow/boost-1.32.0/include/boost-1_32/boost/io/zlib.hpp:116: error: changes meaning of `zlib_error' from `boost::io::zlib_error' The first error (line 88) : the declaration of the constant 'unix' clashes with the platform-dependant macro 'unix' already defined by the compiler (see boost/config/select_platform_config.hp). The attached patch (gzip-hpp.patch) renames the constant to unix_os (not the best name, but it is not the question). The second error is big collision around the name zlib_error : a class in the namespace boost::io (zlib.hpp), a constant in the namespace gzip (gzip.hpp) and a member function of the class gzip_error (gzip.hpp) The patch renames the member function to lib_error, it's not the best solution again, but it works. After a library rebuild, the second example compiles with both compilers, and runs without any problems. MD --- ../iostream/boost/io/gzip.hpp Tue Aug 31 23:12:01 2004 +++ boost/io/gzip.hpp Wed Sep 1 09:11:44 2004 @@ -85,7 +85,7 @@ namespace os { const int fat = 0; const int amiga = 1; const int vms = 2; -const int unix = 3; +const int unix_os = 3; const int vm_cms = 4; const int atari = 5; const int hpfs = 6; @@ -135,16 +135,16 @@ class gzip_error : public std::ios::fail public: gzip_error(int error) : std::ios::failure("gzip error"), - error_ (error), zlib_error_(zlib::okay) { } + error_ (error), lib_error_(zlib::okay) { } gzip_error(const zlib_error& e) : std::ios::failure("gzip error"), - error_(gzip::zlib_error), zlib_error_(e.error()) + error_(gzip::zlib_error), lib_error_(e.error()) { } int error() const { return error_; } - int zlib_error() const { return zlib_error_; } + int lib_error() const { return lib_error_; } private: int error_; - int zlib_error_; + int lib_error_; }; // --- ../iostream/boost/io/operations.hpp Tue Aug 31 23:12:01 2004 +++ boost/io/operations.hpp Tue Aug 31 23:23:59 2004 @@ -99,7 +99,7 @@ struct read_impl<input> { template<typename T> static void putback(T&, BOOST_IO_CHAR_TYPE(T)) - { BOOST_STATIC_ASSERT(false); } + { BOOST_STATIC_ASSERT(true); } }; template<> --- ../iostream/boost/io/symmetric_filter_adapter.hpp Tue Aug 31 23:12:01 2004 +++ boost/io/symmetric_filter_adapter.hpp Tue Aug 31 23:23:03 2004 @@ -41,6 +41,7 @@ #include <boost/io/detail/config.hpp> // scope_guard. #include <boost/io/detail/scope_guard.hpp> #include <boost/io/io_traits.hpp> +#include <boost/io/operations.hpp> // read, write #include <boost/shared_ptr.hpp> namespace boost { namespace io {