id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7347	duplicate symbol while BOOST_ERROR_CODE_HEADER_ONLY is defined	viboes	Beman Dawes	"Even if BOOST_ERROR_CODE_HEADER_ONLY is not documented I wanted to report this defect.

When I define BOOST_ERROR_CODE_HEADER_ONLY building Boost.Thread I get the following error:


{{{
ld: duplicate symbol boost::system::system_category()     in ../../../bin.v2/libs/thread/build/darwin-4.2.1/debug/threading-multi/future.o and ../../../bin.v2/libs/thread/build/darwin-4.2.1/debug/threading-multi/pthread/thread.o for architecture x86_64
collect2: ld returned 1 exit status

    ""g++"" -dynamiclib -Wl,-single_module -install_name ""libboost_thread.dylib""  -o ""../../../bin.v2/libs/thread/build/darwin-4.2.1/debug/threading-multi/libboost_thread.dylib"" ""../../../bin.v2/libs/thread/build/darwin-4.2.1/debug/threading-multi/pthread/thread.o"" ""../../../bin.v2/libs/thread/build/darwin-4.2.1/debug/threading-multi/pthread/once.o"" ""../../../bin.v2/libs/thread/build/darwin-4.2.1/debug/threading-multi/future.o""      -headerpad_max_install_names -g
}}}
 

I guess that you need to declare the following functions inline.


{{{
    BOOST_SYSTEM_DECL const error_category &  system_category();
    BOOST_SYSTEM_DECL const error_category &  generic_category();
}}}


 
"	Bugs	closed	To Be Determined	system	Boost 1.51.0	Problem	fixed		viboes