On 24 March 2018 at 13:35, Andreas Falkenhahn wrote: > When I compile my C++11 project on a 10.5 PPC system using gcc6 and try to > run it on another 10.5 PPC system that doesn't have gcc6 installed, I get an > error that a symbol cannot be imported from /usr/lib/libstdc++.6.dylib. I > guess this is because the libstdc++.6.dylib that is shipped with 10.5 doesn't > contain those new features required by C++11 programs. > > So what is the recommended way of getting the libstdc++.6.dylib required by > my program onto a user system? Of course I wouldn't like to bother users to > install gcc6 from Mac Ports just to be able to run my program. Is there an > easier way? Is the latest libstdc++ available as its own package in Mac Ports > maybe or what is the suggested way of dealing with this?
You need to compile with ABI 4 compatibility (add "-D_GLIBCXX_USE_CXX11_ABI=0" to CXXFLAGS) and then relink them to /usr/lib/libstdc++.6.dylib with install_name_tool. The first step might soon no longer be required (see https://github.com/macports/macports-ports/pull/1469), but you'll probably need to keep running install_name_tool on the resulting libraries/binaries, I assume that your binaries link against /opt/local/lib/libstdc++.6.dylib rather than /usr/lib/libstdc++.*.dylib Mojca
