I would like to make a graphical text in my opengl program so I downloaded this 2D font renderer here. It's a C source and I would like to translate it in C++ and change most of its implementation. However, compiling it in g++ after turning .c into .cpp files gets me in this undefined references in RWops.lib. Maybe the RWops.lib I have is not suitable for C++ and I cannot find this lib file in the internet. How can I resolve this linker errors?
mingw32-g++.exe -LC:\MinGW\include -o bin\Debug\BMfont.exe obj\Debug\BMFtest.o obj\Debug\oglBMFont.o obj\Debug\oglfont.o -lOpenGL32 -lGLfwdll C:\Users\Mark\Documents\CodeBlocks\BMFont\RWops.lib C:\Users\Mark\Documents\CodeBlocks\BMFont\RWops.lib C:\Users\Mark\Documents\CodeBlocks\BMFont\RWops.lib
obj\Debug\oglBMFont.o: In function `Z8bmf_loadP7bm_fontPc':
C:/Users/Mark/Documents/CodeBlocks/BMfont/oglBMFont.cpp:77: undefined reference to `RWFromFile(char const*, char const*)'
C:/Users/Mark/Documents/CodeBlocks/BMfont/oglBMFont.cpp:80: undefined reference to `RWskipline(RWops*)'
C:/Users/Mark/Documents/CodeBlocks/BMfont/oglBMFont.cpp:84: undefined reference to `RWsscanf(RWops*, char*, ...)'
C:/Users/Mark/Documents/CodeBlocks/BMfont/oglBMFont.cpp:104: undefined reference to `RWsscanf(RWops*, char*, ...)'
I'm using MinGW through Code::Blocks
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My cpp file has Scilab and Octave header files. I'm trying to compile using this command
g++ -l:/usr/lib/scilab/libscilab.so -L/usr/lib/scilab -L/usr/lib/scilab -I/usr/include/octave-3.8.1 -I/usr/include/octave-3.8.1/octave -I/usr/include/scilab s_o_test_v4.cpp -o s_o_test_v4
I get the following error
s_o_test_v4.cpp:(.text+0x5f4): undefined reference to `pvApiCtx'
s_o_test_v4.cpp:(.text+0x5ff): undefined reference to `isVarMatrixType'
s_o_test_v4.cpp:(.text+0x61a): undefined reference to `pvApiCtx'
s_o_test_v4.cpp:(.text+0x644): undefined reference to `getMatrixOfDouble'
s_o_test_v4.cpp:(.text+0x743): undefined reference to `string_vector::c_str_vec() const'
s_o_test_v4.cpp:(.text+0x755): undefined reference to `octave_main'
s_o_test_v4.cpp:(.text+0x7a2): undefined reference to `octave_value::octave_value(double)'
s_o_test_v4.cpp:(.text+0x847): undefined reference to `feval(std::string const&, octave_value_list const&, int)'
s_o_test_v4.cpp:(.text+0x8a3): undefined reference to `pvApiCtx'
Both Scilab and Octave functions show error. Should I include or remove something from my compile command?
Maybe the ordering of your make command is wrong, see also
this SO question:
Please also note that libraries need to be specified on the command
line after the files needing them
That would make your command:
g++ -I/usr/include/octave-3.8.1 -I/usr/include/octave-3.8.1/octave -I/usr/include/scilab s_o_test_v4.cpp -o s_o_test_v4 -l:/usr/lib/scilab/libscilab.so -L/usr/lib/scilab -L/usr/lib/scilab
I have a problem linking the wxWidget sample application (http://www.wxwidgets.org/docs/tutorials/hello.htm) with is stored in main.cpp. I try to compile and link it using:
g++ `wx-config --cxxflags --libs` main.cpp
The output I get is the following:
/tmp/ccFHWUaX.o: In function `wxCreateApp()':
main.cpp:(.text+0x31): undefined reference to `wxAppConsole::CheckBuildOptions(char const*, char const*)'
/tmp/ccFHWUaX.o: In function `main':
main.cpp:(.text+0x91): undefined reference to `wxEntry(int&, char**)'
/tmp/ccFHWUaX.o: In function `MyFrame::MyFrame(wxString const&, wxPoint const&, wxSize const&)':
main.cpp:(.text+0x1d2): undefined reference to `wxFrameNameStr'
main.cpp:(.text+0x267): undefined reference to `wxEmptyString'
main.cpp:(.text+0x2ea): undefined reference to `wxEmptyString'
main.cpp:(.text+0x366): undefined reference to `wxMenuBar::wxMenuBar()'
main.cpp:(.text+0x3d1): undefined reference to `wxFrameBase::SetMenuBar(wxMenuBar*)'
main.cpp:(.text+0x3da): undefined reference to `wxStatusLineNameStr'
main.cpp:(.text+0x407): undefined reference to `wxFrame::CreateStatusBar(int, long, int, wxString const&)'
main.cpp:(.text+0x44f): undefined reference to `wxFrameBase::SetStatusText(wxString const&, int)'
main.cpp:(.text+0x533): undefined reference to `wxFrame::~wxFrame()'
(and many lines more...)
WxWidgets-2.8 is installed using the ubuntu repository and its libs are located in /usr/lib/x86_64-linux-gnu. I also tried to build specifying the library path with:
-L/usr/lib/x86_64-linux-gnu/
but, this does not change the output. I was blaming multiarch for my problem, but actually only as I don't know how it works exactly.
Can someone tell me how to build the sample correctly?
Thank you
Michael
When using static linking, the libraries must always come after the object files using the symbols from them, otherwise they're simply ignored by the linker as they're not needed at the moment when it first sees them. So us2012 is correct, you need to put wx-config part after your source file.
You could also use shared wxWidgets libraries, then the order wouldn't matter. But it's still a good habit to use the right order, which works for both static and shared libraries, anyhow.
I am having lots of trouble getting a specific set of drivers working, called libnifalcon.
I am pretty sure that the installation was successful, but when I try to compile the example programs I get the errors:
mars#marslab:~/Documents/libnifalcon-1.0/examples/findfalcons$ g++ findfalcons.cpp
/tmp/cc8TtfGn.o: In function `runFalconTest()':
findfalcons.cpp:(.text+0x6b): undefined reference to `libnifalcon::FalconDevice::FalconDevice()'
findfalcons.cpp:(.text+0xdd): undefined reference to `libnifalcon::FalconDevice::getDeviceCount(unsigned int&)'
findfalcons.cpp:(.text+0x1bd): undefined reference to `libnifalcon::FalconDevice::open(unsigned int)'
findfalcons.cpp:(.text+0x224): undefined reference to `libnifalcon::FalconDevice::isFirmwareLoaded()'
findfalcons.cpp:(.text+0x2ac): undefined reference to `libnifalcon::FalconFirmware::loadFirmware(bool, unsigned int const&, unsigned char*)'
findfalcons.cpp:(.text+0x33b): undefined reference to `libnifalcon::FalconDevice::isFirmwareLoaded()'
findfalcons.cpp:(.text+0x3dd): undefined reference to `libnifalcon::FalconDevice::runIOLoop(unsigned int)'
findfalcons.cpp:(.text+0x504): undefined reference to `libnifalcon::FalconDevice::runIOLoop(unsigned int)'
findfalcons.cpp:(.text+0x512): undefined reference to `libnifalcon::FalconDevice::close()'
findfalcons.cpp:(.text+0x52b): undefined reference to `libnifalcon::FalconDevice::~FalconDevice()'
findfalcons.cpp:(.text+0x53f): undefined reference to `libnifalcon::FalconDevice::~FalconDevice()'
/tmp/cc8TtfGn.o: In function `void libnifalcon::FalconDevice::setFalconFirmware<libnifalcon::FalconFirmwareNovintSDK>()':
findfalcons.cpp:(.text._ZN11libnifalcon12FalconDevice17setFalconFirmwareINS_23FalconFirmwareNovintSDKEEEvv[void libnifalcon::FalconDevice::setFalconFirmware<libnifalcon::FalconFirmwareNovintSDK>()]+0x1d): undefined reference to `libnifalcon::FalconFirmwareNovintSDK::FalconFirmwareNovintSDK()'
collect2: ld returned 1 exit status
How can I verify the libraries are linked correctly? What can I do if they aren't?
You're not linking with anything, i.e.
g++ file.cpp
does not link to any libraries other than the standard library. You need to link with other modules or libraries, probably libnifalcon
g++ findfalcons.cpp -lnifalcon
or... you probably will need to do something like
g++ -L/path/to/libnifalcon findfalcons.cpp -lnifalcon
where -I tells where to look for libraries.
I have a simple program use static library for control pci device. I have got some examples. But i want to make myself some examples but i can't link static libraries.
I have 3 file: led.cpp main.cpp main.h
gcc -c led.cpp -I../utils -I../driver -o led.o
gcc -c main.cpp -I../utils -I../driver -o main.o
it' s ok. Succesfuly creating main.o and led.o object files.
But when linking state, its broken. 24dsi20c500k_utils.a and 24dsi20c500k_dsl.a static libraries.
gcc led.o main.o ../utils/24dsi20c500k_utils.a ../docsrc/24dsi20c500k_dsl.a -o led
Output is shown:
led.o: In function `led_tests(int)':
led.cpp:(.text+0x18): undefined reference to `gsc_label(char const*)'
led.cpp:(.text+0x31): undefined reference to `dsi20c500k_initialize(int, int)'
led.cpp:(.text+0x39): undefined reference to `gsc_label_level_inc()'
led.cpp:(.text+0x5b): undefined reference to `dsi20c500k_led(int, int, int, int*)'
led.cpp:(.text+0x81): undefined reference to `dsi20c500k_led(int, int, int, int*)'
led.cpp:(.text+0xa2): undefined reference to `gsc_label_level_dec()'
led.cpp:(.text+0xb1): undefined reference to `dsi20c500k_initialize(int, int)'
main.o: In function `_perform_tests(int)':
main.cpp:(.text+0x3a1): undefined reference to `gsc_label(char const*)'
main.cpp:(.text+0x3c6): undefined reference to `gsc_id_driver(int, char const*)'
main.o: In function `main':
main.cpp:(.text+0x42c): undefined reference to `gsc_label_init(int)'
main.cpp:(.text+0x49a): undefined reference to `gsc_id_host()'
main.cpp:(.text+0x4a4): undefined reference to `gsc_count_boards(char const*)'
main.cpp:(.text+0x4b6): undefined reference to `gsc_select_1_board(int, int*)'
main.cpp:(.text+0x4d7): undefined reference to `gsc_label(char const*)'
main.cpp:(.text+0x500): undefined reference to `gsc_dev_open(unsigned int, char const*)'
main.cpp:(.text+0x54f): undefined reference to `gsc_dev_close(unsigned int, int)'
collect2: ld returned 1 exit status
make: *** [led] Error 1
if i rename cpp files to c files compilation succesfull. What is the problem?
gcc -c main.cpp will compile your code as C++ code.
What likely happens then, is that your main.cpp includes other header files, that are not meant to be compiled as C++. This means that when including these header files in a C++ program , gcc will assume all the stuff the header files declares are C++.
And if they're not, you get linker errors if you try to link to C code that the compiler assumed was C++.
You can remedy this by stating that those header files are C. e.g. in your main.cpp you'd do
extern "C" {
#include "some_c_lib.h"
}
You probably didn't use extern "C".
if i rename cpp files to c files compilation succesfull. What is the
problem?
I had written my program using XCode. It works without any problems on the Mac. I was told that our projects would be compiled on Linux machines so I wanted to make sure it works on Linux before submitting. When I tried to compile on Linux, it gave me some reference errors:
/tmp/cckwoehj.o: In function `main':
main.cpp:(.text+0x9): undefined reference to `ReadFile()'
/tmp/cckwoehj.o: In function `leftSearch(NODE*, int)':
main.cpp:(.text+0x38b): undefined reference to `conflict(int**)'
main.cpp:(.text+0x3ca): undefined reference to `removeAllRowsWithLiteral(int**, int)'
main.cpp:(.text+0x3ec): undefined reference to `removeAllSpecifiedLiteral(int**, int)'
main.cpp:(.text+0x4ec): undefined reference to `conflict(int**)'
main.cpp:(.text+0x522): undefined reference to `unitPropagation(int**)'
main.cpp:(.text+0x538): undefined reference to `conflict(int**)'
/tmp/cckwoehj.o: In function `rightSearch(NODE*, int)':
main.cpp:(.text+0x992): undefined reference to `conflict(int**)'
main.cpp:(.text+0x9d4): undefined reference to `removeAllRowsWithLiteral(int**, int)'
main.cpp:(.text+0x9f3): undefined reference to `removeAllSpecifiedLiteral(int**, int)'
main.cpp:(.text+0xaf3): undefined reference to `conflict(int**)'
main.cpp:(.text+0xb29): undefined reference to `unitPropagation(int**)'
main.cpp:(.text+0xb3f): undefined reference to `conflict(int**)'
collect2: ld returned 1 exit status
The stuff I found online all talks about templates. I don't use templates. I also found one about a 32 and 64 bit OS problem which I do not have.
I have a function called ReadFile that is declared in a header. I call it from main and include that header file in main. I am not sure what the problem is. If OS X compiles and runs and Linux doesn't, I am assuming there is something OS X does internally that it thinks is obvious but Linux is not written that way. Is this a linker error? I think OS X would be programmed to do that internally.
You're declaring your functions in a header, but there's no definition, leading to undefined references when you try to turn main.cpp into an executable.
You need to compile all your source files and link them together (in the right order).
g++ -c ReadFile.cpp
#...
g++ -c main.cpp
g++ main.o ... ReadFile.o -o my_executable
Where the object files to the right rely on no unresolved symbols defined in the object files to its left on the commandline.
XCode is an IDE so I guess it handles the linking order for you.
To handle all this stuff automatically you'll have to also use an IDE and/or write a Makefile.
If you insist in a single command, yes, you can, as long as you include all source files in the line (e.g. g++ *.cpp), but this forces a full recompilation for every single change.