Order in which you specify things to be linked (object files and libraries) may matter. Have you tried moving -lpoppler-cpp around?
Has the code you're building ever been successfully linked?
Is this code published?
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
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w __cxa_finalize@@GLIBC_2.2.5
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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)
<address@hidden> 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" <address@hidden> 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
>> address@hidden
>> https://lists.gnu.org/mailman/listinfo/gnustep-dev
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