On 23/06/2012 14:09, Jürgen Hunold wrote:
Hi Ken,
On Saturday, 23. June 2012 13:51:52 Ken wrote:
In porting from 1_41 to 1_49 on mingw this no longer links because the boost::archive::basic_xml_grammar<char> class's symbols are no longer exported from the serialization library.
This sounds odd. Are you sure you are setting BOOST_ALL_DYN_LINK and/or BOOST_SERIALIZATION_DYN_LINK during compilation? The export/import magic looks fine to me.
And please provide a compilable testcase. There are flags and #defines which might trigger this behaviour.
Yours,
Jürgen
Thanks Jürgen. No, we are not setting BOOST_SERIALIZATION_DYN_LINK. Where should that be defined? A minimal test case is below. The evidence I was using, maybe erroneously, to claim that boost::archive::basic_xml_grammar<char> symbols are not exported is that a) nm stage/lib/libboost_serialization-mgw44-1_49.dll.a | grep grammar produces nothing. b) The file boost/archive/impl/basic_xml_grammar.hpp contains declarations only. The implementation is defined in libs/serialization/src/basic_xml_grammar.ipp and libs/serialization/src/xml_grammar.cpp. Unlike the other serialization classes, the code does not use BOOST_ARCHIVE_DECL or equivalent to export the symbols. Regards, Ken =================================== xmlia.hpp # if ! defined __xmliarchive_h_ # define __xmliarchive_h_ #include <boost/archive/xml_iarchive.hpp> class XmlInputArchive : public boost::archive::xml_iarchive_impl< XmlInputArchive >, public boost::archive::detail::shared_ptr_helper { typedef boost::archive::xml_iarchive_impl< XmlInputArchive > Base; public: XmlInputArchive( std::istream& is, unsigned int flags = 0 ); void load_start( const char * name ); void load_end( const char * name ); }; BOOST_SERIALIZATION_REGISTER_ARCHIVE( XmlInputArchive ) # endif ======================================= xmlia.cpp #include "xmlia.hpp" #include <boost/archive/impl/basic_xml_iarchive.ipp> #include <boost/archive/impl/xml_iarchive_impl.ipp> XmlInputArchive::XmlInputArchive( std::istream & is, unsigned int flags ) : boost::archive::xml_iarchive_impl< XmlInputArchive >( is, flags ) { } void XmlInputArchive::load_start( const char * name ) { } void XmlInputArchive::load_end( const char * name ) { } ========================================= Compiled and linked like this: g++ -c -D__STDC_CONSTANT_MACROS -I. -O3 -frtti -fexceptions -mthreads -Wall -Wno-non-virtual-dtor -Wno-ctor-dtor-privacy -Wno-strict-aliasing -DUNICODE -I'c:/Boost/boost_1_49_0' -o release/xmlia.o xmlia.cpp g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -Wl,-s -shared -export-all-symbols -mthreads -Wl -Wl,--out-implib,release/libarchive_r.a -orelease/archive_r.dll release/xmlia.o -Lc:/Boost/boost_1_49_0/stage/lib -lboost_serialization-mgw44-1_49 g++ is from the Qt mingw toolkit c:/Qt/2010.05/mingw/bin/g++ g++ --version => g++.exe (GCC) 4.4.0