duplicate symbol while BOOST_ERROR_CODE_HEADER_ONLY is defined

[viboes]

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();

[viboes]

Simple patch that solves my issue. OK to commit?

[viboes]

Needed to run the Boost.Thread test if BOOST_ERROR_CODE_HEADER_ONLY is defined

[viboes]

The fact that the boost/../libs/system/src/error_code.cpp introduce too much symbols because of the using statements has as consequence.

test_7328.cpp: In function ‘void f()’:
test_7328.cpp:26: error: reference to ‘interrupted’ is ambiguous
test_7328.cpp:13: error: candidates are: bool interrupted
../../../boost/system/error_code.hpp:84: error:                 boost::system::errc::errc_t boost::system::errc::interrupted

The patch 7347_2 contribute to solve these issues.

[viboes]

It seems to me that these patches have been applied without closing the ticket.