Re: [Boost-users] Fwd: Getting ASIO application to link (undefined reference to `boost::system::generic_category()) (SOLVED)

On 2013-09-18 08:32, Slava wrote:

On Tue, 17 Sep 2013 19:20:54 +0200, Ulf Samuelsson wrote:

...

Solved! The Libraries need to be at the end during the link phase.

$ g++ -c -I/usr/include -Iinclude -std=c++0x -o udp_echo_client.o udp_echo_client.cpp $ g++ -o udp_echo_client udp_echo_client.o -L/usr/lib -lboost_filesystem -lboost_system -lpthread

works

BR Ulf

... what means that the linker uses static libraries (.a). Use -t linker flag (-Wl,-t to gcc) to debug which libraries linker finds and which it takes. // The *.so are in -dev packages in some distributions. Maybe you need boost*dev package(s) installed in ubuntu?

No, the solution is simple. The -l<library> must be AFTER the reference to the object files. FAIL: g++ -lboost_system myfile.o OK: g++ myfile.o -lboost_system Maybe there is a good reason for this. BR Ulf

Regards, Slava

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