1) Are you referring to the external library I'm trying to link against? It's poppler-cpp
Output: U abort@@GLIBC_2.2.5 00000000002125b8 B __bss_start 00000000002125b8 b completed.7585 000000000000ebe0 r CSWTCH.189 000000000000ebc0 r CSWTCH.191 U __cxa_atexit@@GLIBC_2.2.5 w __cxa_finalize@@GLIBC_2.2.5 0000000000008670 t deregister_tm_clones 0000000000008700 t __do_global_dtors_aux 0000000000211d68 t __do_global_dtors_aux_fini_array_entry 00000000002125a8 d __dso_handle 0000000000211d78 d _DYNAMIC 00000000002125b8 D _edata 00000000002125d8 B _end U __errno_location@@GLIBC_2.2.5 U fclose@@GLIBC_2.2.5 000000000000eab4 T _fini U fopen@@GLIBC_2.2.5 0000000000008740 t frame_dummy 0000000000211d48 t __frame_dummy_init_array_entry 00000000000114c8 r __FRAME_END__ U free@@GLIBC_2.2.5 0000000000212000 d _GLOBAL_OFFSET_TABLE_ U globalParams 00000000000085e0 t _GLOBAL__sub_I_poppler_global.cpp 0000000000008610 t _GLOBAL__sub_I_poppler_private.cpp 0000000000008640 t _GLOBAL__sub_I_poppler_rectangle.cpp w __gmon_start__ 000000000000ec9c r __GNU_EH_FRAME_HDR U iconv_close@@GLIBC_2.2.5 U iconv@@GLIBC_2.2.5 U iconv_open@@GLIBC_2.2.5 0000000000007a80 T _init w _ITM_deregisterTMCloneTable w _ITM_registerTMCloneTable 0000000000211d70 d __JCR_END__ 0000000000211d70 d __JCR_LIST__ w _Jv_RegisterClasses U malloc@@GLIBC_2.2.5 U memcpy@@GLIBC_2.14 U memmove@@GLIBC_2.2.5 U memset@@GLIBC_2.2.5 00000000000086b0 t register_tm_clones U __stack_chk_fail@@GLIBC_2.4 U strlen@@GLIBC_2.2.5 00000000002125b8 d __TMC_END__ U tolower@@GLIBC_2.2.5 U _Z16dateStringToTimeP9GooString U _Z16setErrorCallbackPFvPv13ErrorCategoryxPcES_ U _Z16timeToDateStringPl U _Z5error13ErrorCategoryxPKcz U _ZdlPv@@GLIBCXX_3.4 000000000000da50 t _ZL21stderr_debug_functionRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPv U _ZN10JpegWriterC1ENS_6FormatE U _ZN10TiffWriterC1ENS_6FormatE U _ZN11OutlineItem4openEv U _ZN12GlobalParamsC1EPKc U _ZN12GlobalParamsD1Ev U _ZN12NetPBMWriterC1ENS_6FormatE U _ZN13TextOutputDev7getTextEdddd U _ZN13TextOutputDev8takeTextEv U _ZN13TextOutputDevC1EPcbdbb U 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_ZN6PDFDoc20saveWithoutChangesAsEP9GooString U _ZN6PDFDoc21getDocInfoStringEntryEPKc U _ZN6PDFDoc21setDocInfoStringEntryEPKcP9GooString U _ZN6PDFDoc5getIDEP9GooStringS1_ U _ZN6PDFDoc6saveAsEP9GooString12PDFWriteMode U _ZN6PDFDocC1EP10BaseStreamP9GooStringS3_Pv U _ZN6PDFDocC1EP9GooStringS1_S1_Pv U _ZN6PDFDocD1Ev U _ZN7Catalog11getPageModeEv U _ZN7Catalog12embeddedFileEi U _ZN7Catalog12indexToLabelEiP9GooString U _ZN7Catalog12labelToIndexEP9GooStringPi U _ZN7Catalog12readMetadataEv U _ZN7Catalog13getPageLayoutEv U _ZN7Catalog23getEmbeddedFileNameTreeEv U _ZN7Catalog7getPageEi U _ZN7GooListD1Ev 000000000000e750 T _ZN7poppler11toc_private17load_from_outlineEP7Outline 000000000000e520 T _ZN7poppler11toc_privateC1Ev 000000000000e520 T _ZN7poppler11toc_privateC2Ev 000000000000e7f0 T _ZN7poppler11toc_privateD1Ev 000000000000e7f0 T _ZN7poppler11toc_privateD2Ev 000000000000b6d0 T _ZN7poppler12convert_dateERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE 000000000000ce60 T _ZN7poppler12page_privateC1EPNS_16document_privateEi 000000000000ce60 T _ZN7poppler12page_privateC2EPNS_16document_privateEi 000000000000cea0 T _ZN7poppler12page_privateD1Ev 000000000000cea0 T _ZN7poppler12page_privateD2Ev 000000000000a680 T _ZN7poppler13embedded_fileC1ERNS_21embedded_file_privateE 000000000000a680 T _ZN7poppler13embedded_fileC2ERNS_21embedded_file_privateE 000000000000a6f0 T _ZN7poppler13embedded_fileD1Ev 000000000000a6f0 T _ZN7poppler13embedded_fileD2Ev 000000000000b190 T _ZN7poppler13font_iterator4nextEv 000000000000b0f0 T _ZN7poppler13font_iteratorC1EiPNS_16document_privateE 000000000000b0f0 T _ZN7poppler13font_iteratorC2EiPNS_16document_privateE 000000000000b150 T _ZN7poppler13font_iteratorD1Ev 000000000000b150 T _ZN7poppler13font_iteratorD2Ev 000000000000c220 T _ZN7poppler13image_private11create_dataEiiNS_5image11format_enumE 000000000000c2f0 T _ZN7poppler13image_private11create_dataEPciiNS_5image11format_enumE 000000000000c1c0 T 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_ZNSt9basic_iosIcSt11char_traitsIcEE4initEPSt15basic_streambufIcS1_E@@GLIBCXX_3.4 U _ZNSt9basic_iosIcSt11char_traitsIcEE5clearESt12_Ios_Iostate@@GLIBCXX_3.4 U _Znwm@@GLIBCXX_3.4 U _ZSt16__ostream_insertIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_PKS3_l@@GLIBCXX_3.4.9 U _ZSt17__throw_bad_allocv@@GLIBCXX_3.4 U _ZSt19__throw_logic_errorPKc@@GLIBCXX_3.4 U _ZSt20__throw_length_errorPKc@@GLIBCXX_3.4 U _ZSt4cerr@@GLIBCXX_3.4 00000000002125c0 b _ZStL8__ioinit 00000000002125d0 b _ZStL8__ioinit 00000000002125d1 b _ZStL8__ioinit U _ZTTNSt7__cxx1119basic_ostringstreamIcSt11char_traitsIcESaIcEEE@@GLIBCXX_3.4.21 U _ZTVNSt7__cxx1115basic_stringbufIcSt11char_traitsIcESaIcEEE@@GLIBCXX_3.4.21 U _ZTVNSt7__cxx1119basic_ostringstreamIcSt11char_traitsIcESaIcEEE@@GLIBCXX_3.4.21 U _ZTVSt15basic_streambufIcSt11char_traitsIcEE@@GLIBCXX_3.4 U _ZTVSt9basic_iosIcSt11char_traitsIcEE@@GLIBCXX_3.4 2) #include <poppler/cpp/poppler-document.h> #include <poppler/cpp/poppler-page.h> #include <poppler/cpp/poppler-pagerenderer.h> #include <poppler/cpp/poppler-image.h> 3) g++ -rdynamic -lfreetype -lpoppler-cpp -lSDL -shared-libgcc -pthread -fexceptions -fgnu-runtime -o obj/WindowServer \ ./obj/WindowServer.obj/hash.m.o ./obj/WindowServer.obj/tree.m.o ./obj/WindowServer.obj/stack.m.o ./obj/WindowServer.obj/WSFeedback.m.o ./obj/WindowServer.obj/WSComponent.m.o ./obj/WindowServer.obj/WSModule.m.o ./obj/WindowServer.obj/WSModuleManager.m.o ./obj/WindowServer.obj/WSDisplayModule.m.o ./obj/WindowServer.obj/WSKeyboardModule.m.o ./obj/WindowServer.obj/WSPointerModule.m.o ./obj/WindowServer.obj/WSMiscModule.m.o ./obj/WindowServer.obj/WSEvent.m.o ./obj/WindowServer.obj/WSWindowManager.m.o ./obj/WindowServer.obj/WSConfigurationReader.m.o ./obj/WindowServer.obj/WSServerCore.m.o ./obj/WindowServer.obj/WSWindow.m.o ./obj/WindowServer.obj/main.m.o ./obj/WindowServer.obj/rendering.cc.o \ -L/home/jamie/Developer/System/lib -L/home/jamie/Library/Libraries -L/home/jamie/Developer/System/LocalLibrary/Libraries -L/home/jamie/Developer/System/Net/Library/Libraries -L/home/jamie/Developer/System/SystemLibrary/Libraries -lgnustep-base -lobjc -lm ./obj/WindowServer.obj/rendering.cc.o: In function `renderPDF': /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:16: undefined reference to `poppler::image::image()' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:20: undefined reference to `poppler::document::load_from_raw_data(char const*, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:24: undefined reference to `poppler::document::create_page(int) const' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:28: undefined reference to `poppler::page_renderer::page_renderer()' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:29: undefined reference to `poppler::page_renderer::render_page(poppler::page const*, double, double, int, int, int, int, poppler::rotation_enum) const' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:29: undefined reference to `poppler::image::operator=(poppler::image const&)' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:29: undefined reference to `poppler::image::~image()' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:30: undefined reference to `poppler::image::data()' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:31: undefined reference to `poppler::image::height() const' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:31: undefined reference to `poppler::image::bytes_per_row() const' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:16: undefined reference to `poppler::image::~image()' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:29: undefined reference to `poppler::image::~image()' /home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source/rendering.cc:16: undefined reference to `poppler::image::~image()' collect2: error: ld returned 1 exit status /home/jamie/Developer/System/SystemDeveloper/Makefiles/Instance/tool.make:89: recipe for target 'obj/WindowServer' failed make[4]: *** [obj/WindowServer] Error 1 /home/jamie/Developer/System/SystemDeveloper/Makefiles/Instance/tool.make:74: recipe for target 'internal-tool-all_' failed make[3]: *** [internal-tool-all_] Error 2 /home/jamie/Developer/System/SystemDeveloper/Makefiles/Master/rules.make:311: recipe for target 'WindowServer.all.tool.variables' failed make[2]: *** [WindowServer.all.tool.variables] Error 2 /home/jamie/Developer/System/SystemDeveloper/Makefiles/Master/tool.make:71: recipe for target 'internal-all' failed make[1]: *** [internal-all] Error 2 make[1]: Leaving directory '/home/jamie/Developer/Projects/FREEDOMSTEP/GNUWindowServer-I/Source' /home/jamie/Developer/System/SystemDeveloper/Makefiles/Master/serial-subdirectories.make:53: recipe for target 'internal-all' failed make: *** [internal-all] Error 2 On Sat, Aug 26, 2017 at 7:07 PM, Daniel Ferreira (theiostream) <bnm...@gmail.com> wrote: > Could you point us out to: > 1) the output of running `nm libYourLibrary.so` > 2) the header declarations for the functions you are using > 3) the error output of the linker? > > -- Daniel. > > Em 26 de ago de 2017 19:03, "Jamie Ramone" <sancom...@gmail.com> escreveu: >> >> Hello world! I'm trying to build a project of mine in GNUstep which >> requires some functionality provided by an external library, which is >> in C++. I tried to build it with portions in Objc++ but faild. I said >> it couldn't find the symbols it needed (calls to the methods of c++ >> objects). So I rewrote the thing moving the c++ dependencies to a >> function in a plain c++ file. Strike 2. I checked around on the web >> and discovered i needed the 'extern "C" {' thingy, so I added that. I >> even rebuilt the external library, knowing that Ubuntu has more bugs >> than rotting wood. Didn't help. I'm all out of ideas. Can anyone help? >> Please let me know what information you need. Thanx! >> >> _______________________________________________ >> Gnustep-dev mailing list >> Gnustep-dev@gnu.org >> https://lists.gnu.org/mailman/listinfo/gnustep-dev _______________________________________________ Gnustep-dev mailing list Gnustep-dev@gnu.org https://lists.gnu.org/mailman/listinfo/gnustep-dev