On 24.03.2018 at 14:07 Mojca Miklavec wrote: > 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 Yes, it does. Unfortunately, compiling with -D_GLIBCXX_USE_CXX11_ABI=0 and then changing /opt/local/lib/libstdc++.6.dylib to /usr/lib/libstdc++.6.dylib using install_name_tool doesn't work. It still can't find some symbols. Here's the error I get when trying to dlopen() my project: dyld: lazy symbol binding failed: Symbol not found: __ZSt16__ostream_insertIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_PKS3_i Referenced from: test.dylib Expected in: /usr/lib/libstdc++.6.dylib dyld: Symbol not found: __ZSt16__ostream_insertIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_PKS3_i Referenced from: test.dylib Expected in: /usr/lib/libstdc++.6.dylib -- Best regards, Andreas Falkenhahn mailto:andr...@falkenhahn.com
