[boost] Further to boost::io::detail::empty_buf problem with shared libs

From: Paul Hamilton (paul_at_[hidden])
Date: 2003-08-17 23:03:59

After studying my problem with this:

  template<class Tr, class Ch> inline
   void empty_buf(BOOST_IO_STD basic_ostringstream<Ch,Tr> & os) {
     static const std::basic_string<Ch, Tr> emptyStr;
     os.str(emptyStr);
   }

I want to post the actual link error I get back:

darwin-Link-action  
libs/bin/libcpppersistxmllib.dylib/darwin/debug/runtime-link-dynamic/ 
shared-linkable-true/libcpppersistxmllib.dylib
ld: common symbols not allowed with MH_DYLIB output format
libs/bin/libcpppersistxmllib.dylib/darwin/debug/runtime-link-dynamic/ 
shared-linkable-true/parse.o definition of common  
_ZZN5boost2io6detail30_GLOBAL__N_xml_parse.cpp84XT3a9empty_bufISt11char_ 
traitsIcEcEEvRSt19basic_ostringstreamIT0_T_SaIS7_EEE8emptyStr (size 4)
libs/bin/libcpppersistxmllib.dylib/darwin/debug/runtime-link-dynamic/ 
shared-linkable-true/parseobj.o definition of common  
_ZZN5boost2io6detail33_GLOBAL__N_xml_parseobj.cpp2bh23a9empty_bufISt11ch 
ar_traitsIcEcEEvRSt19basic_ostringstreamIT0_T_SaIS7_EEE8emptyStr (size  
4)

     export DYLD_LIBRARY_PATH
     c++ -g -Wl,-dynamic -nostartfiles -Wl,-dylib -Wl,-ldylib1.o  -o  
"libs/bin/libcpppersistxmllib.dylib/darwin/debug/runtime-link-dynamic/ 
shared-linkable-true/libcpppersistxmllib.dylib"   
"libs/bin/libcpppersistxmllib.dylib/darwin/debug/runtime-link-dynamic/ 
shared-linkable-true/parse.o"  
"libs/bin/libcpppersistxmllib.dylib/darwin/debug/runtime-link-dynamic/ 
shared-linkable-true/parseobj.o"  
"libs/bin/libcpppersistxmllib.dylib/darwin/debug/runtime-link-dynamic/ 
shared-linkable-true/writeobj.o"  \
            \

You can see this is a bit weird because the names are mangled to  
something completely different, but the linker says something about  
"common" problems. Does anybody know what this is about?

Maybe the problem is that the symbols should really be common but are  
given two completely different names, since they are compiled in too  
different units? Not sure.

Paul.

---------------------
Paul Hamilton
pHamtec P/L - Software Makers
http://www.phamtec.com/
mailto:paul_at_[hidden]

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