Thank you for the help! > It seems to be missing the linker command line for building the CXXException > test. It’s probably worth taking a step back at this point: > > On Linux platforms, it’s common to provide libsupc++ (the GNU C++ runtime > library) statically linked into libstdc++ (the GNU C++ standard library). > This is somewhat awkward, because this means that the only way to use symbols > in libsupc++ is to add a dependency on libstdc++. I’ve tried to avoid that > for libobjc, because libstdc++ is a big library and is completely unused for > pure Objective-C programs. > > On FreeBSD, we ship libcxxrt (the BSD C++ runtime, which I wrote) as a > separate .so and link both libstdc++ and libc++ (the LLVM C++ standard > library) to it dynamically, so we can support programs linked to both. This > means that on FreeBSD we ship libobjc.so dynamically linked to libcxxrt.so, > and that doesn’t add much to the dependency footprint for any Objective-C > project. > > By default, the libobjc CMake build looks for libcxxrt.so or libsupc++.so > and, if it doesn’t find them, will build a libobjcxx.so that links to > libstdc++ and to libobjc.so. This extra library provides the required > functionality for Objective-C++. If you are seeing this being built, then > you will need to link it for Objective-C++ to work. This configuration isn’t > as well tested, because I don’t use any platforms that package things like > this on a regular basis. > > TL;DR: Can you try adding -lobjcxx and see if that makes things work again > for you?
I tried adding this to Test/CMakeFiles/CXXExceptions.dir/link.txt and Test/CMakeFiles/CXXExceptions_optimised.dir/link.txt, but the linker couldn't find the shared library: /usr/bin/ld.bfd.real: cannot find -lobjcxx I located the .so at the root of my build tree: (ALSI8)dlobron@bos-lps80:~/build/clangport/akamai/libobjc2$ find . -name libobjcxx.so ./libobjc2-1.8.1/build/libobjcxx.so I added -L.. to the linker command. The linker was then able to find libobjcxx.so, but unfortunately the exception errors came back, along with some new ones from libobjcxx.so: (ALSI8)dlobron@bos-lps80:~/build/clangport/akamai/libobjc2/libobjc2-1.8.1/build/Test$ /home/dlobron/build/clangport/akamai/llvm/llvm-5.0.0.install/bin/clang -std=gnu99 -fexceptions -rdynamic -lobjcxx CMakeFiles/CXXExceptions_optimised.dir/CXXException.m.o CMakeFiles/CXXExceptions_optimised.dir/CXXException.cc.o -o CXXExceptions_optimised -Wl,-rpath,/home/dlobron/build/clangport/akamai/libobjc2/libobjc2-1.8.1/build ../libobjc.so.4.6 -L.. CMakeFiles/CXXExceptions_optimised.dir/CXXException.cc.o: In function `throw_int': /home/dlobron/build/clangport/akamai/libobjc2/libobjc2-1.8.1/Test/CXXException.cc:(.text+0x7): undefined reference to `__cxa_allocate_exception' /home/dlobron/build/clangport/akamai/libobjc2/libobjc2-1.8.1/Test/CXXException.cc:(.text+0x12): undefined reference to `typeinfo for int' /home/dlobron/build/clangport/akamai/libobjc2/libobjc2-1.8.1/Test/CXXException.cc:(.text+0x1c): undefined reference to `__cxa_throw' CMakeFiles/CXXExceptions_optimised.dir/CXXException.cc.o: In function `catchall': /home/dlobron/build/clangport/akamai/libobjc2/libobjc2-1.8.1/Test/CXXException.cc:(.text+0x2c): undefined reference to `__cxa_begin_catch' /home/dlobron/build/clangport/akamai/libobjc2/libobjc2-1.8.1/Test/CXXException.cc:(.text+0x3b): undefined reference to `__cxa_rethrow' /home/dlobron/build/clangport/akamai/libobjc2/libobjc2-1.8.1/Test/CXXException.cc:(.text+0x43): undefined reference to `__cxa_end_catch' CMakeFiles/CXXExceptions_optimised.dir/CXXException.cc.o: In function `__clang_call_terminate': /home/dlobron/build/clangport/akamai/libobjc2/libobjc2-1.8.1/Test/CXXException.cc:(.text.__clang_call_terminate[__clang_call_terminate]+0x2): undefined reference to `__cxa_begin_catch' /home/dlobron/build/clangport/akamai/libobjc2/libobjc2-1.8.1/Test/CXXException.cc:(.text.__clang_call_terminate[__clang_call_terminate]+0x7): undefined reference to `std::terminate()' CMakeFiles/CXXExceptions_optimised.dir/CXXException.cc.o:(.eh_frame+0x3f): undefined reference to `__gxx_personality_v0' ../libobjcxx.so: undefined reference to `operator delete(void*)' ../libobjcxx.so: undefined reference to `std::type_info::__is_pointer_p() const' ../libobjcxx.so: undefined reference to `typeinfo for std::type_info' ../libobjcxx.so: undefined reference to `std::type_info::__is_function_p() const' ../libobjcxx.so: undefined reference to `__dynamic_cast' ../libobjcxx.so: undefined reference to `std::type_info::__do_upcast(__cxxabiv1::__class_type_info const*, void**) const' ../libobjcxx.so: undefined reference to `vtable for std::type_info' ../libobjcxx.so: undefined reference to `vtable for __cxxabiv1::__si_class_type_info' ../libobjcxx.so: undefined reference to `std::type_info::~type_info()' clang-6.0: error: linker command failed with exit code 1 (use -v to see invocation) Drat! :) Do you know where I might go from here? BTW, in case I did not note them before, here is a list of the versions I am using- please let me know if I should try upgrading one of these: libobjc2-1.8.1 gnustep-base-1.24.9 gnustep-make-2.6.0 llvm-5.0.0 Ubuntu Linux with kernel 3.13.0-125-generic Thanks! --David _______________________________________________ Discuss-gnustep mailing list Discuss-gnustep@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnustep
