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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have a C++ project (quite extensive, lots of sub-projects that produce libraries used in the final executable) which I can compile just fine with gcc 5.1.0.<o:p></o:p></p>
<p class="MsoNormal">As an alternative, some preparations have been previously done to compile the project with clang (in this case 3.6.2), which we’d as a company like to transition to at some point.<o:p></o:p></p>
<p class="MsoNormal">However when compiling with clang, I get several undefined references when linking the final executable on some libraries in the project which I don’t get when compiling with gcc.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">First let me explain my build environment, which is custom:<o:p></o:p></p>
<p class="MsoNormal">I have an openSUSE 11.3 OS due to backwards compatibility reasons<o:p></o:p></p>
<p class="MsoNormal">Originally, gcc 4.5 is installed (located in /usr/bin)<o:p></o:p></p>
<p class="MsoNormal">I compiled gcc 5.1 myself (using gcc 4.5, located in /usr/local/bin, $PATH has been modified to search here first)<o:p></o:p></p>
<p class="MsoNormal">I compiled clang 3.6.2 myself (using gcc 5.1, located in /usr/local/bin)<o:p></o:p></p>
<p class="MsoNormal">Several other libraries (including mysql++ & boost) are compiled with gcc (located in /usr/local/lib, headers in /usr/local/include)<o:p></o:p></p>
<p class="MsoNormal">Codelite 8.0, compiled with gcc 5.1<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Now when doing a clean clang build of my project I get 4 undefind reference linking errors:<o:p></o:p></p>
<p class="MsoNormal">/home/rohill/Projects/60ChannelSIP/bin/Clang/opt/swmi/lib/libSystem.so: undefined reference to `boost::program_options::arg'<o:p></o:p></p>
<p class="MsoNormal">/home/rohill/Projects/60ChannelSIP/bin/Clang/opt/swmi/lib/libMysql.so: undefined reference to `mysqlpp::Query::str(mysqlpp::SQLQueryParms&)'<o:p></o:p></p>
<p class="MsoNormal">/home/rohill/Projects/60ChannelSIP/bin/Clang/opt/swmi/lib/libTfc.so: undefined reference to `std::ios_base::failure::failure(char const*, std::error_code const&)'<o:p></o:p></p>
<p class="MsoNormal">/home/rohill/Projects/60ChannelSIP/bin/Clang/opt/swmi/lib/libTfc.so: undefined reference to `boost::gregorian::greg_month::get_month_map_ptr()'<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am able to resolve the issues with boost & mysqlpp by recompiling these with clang, but after that, I get 2 more undefined references to std::ios_base::failure::failure:<o:p></o:p></p>
<p class="MsoNormal">/home/rohill/Projects/60ChannelSIP/bin/Clang/opt/swmi/lib/libboost_iostreams.so: undefined reference to `std::ios_base::failure::failure(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'<o:p></o:p></p>
<p class="MsoNormal">/home/rohill/Projects/60ChannelSIP/bin/Clang/opt/swmi/lib/libboost_iostreams.so: undefined reference to `std::ios_base::failure::failure(char const*, std::error_code const&)'<o:p></o:p></p>
<p class="MsoNormal">/home/rohill/Projects/60ChannelSIP/bin/Clang/opt/swmi/lib/libTfc.so: undefined reference to `std::ios_base::failure::failure(char const*, std::error_code const&)'<o:p></o:p></p>
<p class="MsoNormal">But I don’t know if I want to do this, because I am no longer able to compile the project with gcc after this.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Furthermore, I find it rather strange that clang produces these linking issues in the first place, as it can compile and link those specific libraries just fine earlier in the build.<o:p></o:p></p>
<p class="MsoNormal">All external libraries used to compile & link the projects libraries are also configured for the linking of the final executable.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am at a loss for an answer, but I suspect it having to do something with gcc 4.5 in some way, so I hope to get an answer via this.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kind regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="color:#003366;mso-fareast-language:EN-GB">Roy Kleefman</span></b><span style="color:#003366;mso-fareast-language:EN-GB"><br>
<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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