i am trying to setup SDL2 with eclipse(linux), but eclipse only throw errors "undefined reference". I found on google that i need to add this flag "-lSDL2" to the linker. So i go to Project Settings -> C/C++ Build -> Settings -> GCC Linker -> Miscellaneous and added it there to the Linker flags. But it doesn't work, eclipse throw this error:
Building target: test_c
Invoking: GCC C Linker
gcc -lSDL2 -o "test_c" ./main.o
./main.o: In function `main':
/home/nimmi/Documents/workspace/test_c/Debug/../main.c:7: undefined reference to `SDL_Init'
makefile:29: recipe for target 'test_c' failed
/home/nimmi/Documents/workspace/test_c/Debug/../main.c:11: undefined reference to `SDL_CreateWindow'
/home/nimmi/Documents/workspace/test_c/Debug/../main.c:20: undefined reference to `SDL_UpdateWindowSurface'
/home/nimmi/Documents/workspace/test_c/Debug/../main.c:21: undefined reference to `SDL_Delay'
collect2: error: ld returned 1 exit status
make: *** [test_c] Error 1
12:17:09 Build Finished (took 172ms)
Related
Under Linux(Ubuntu) I'm writing a CMakeLists.txt with CLion to compile my project which is a little game written in C. How do I fix these errors?
Here's a link to the entire source code.
Any help will be greatly appreciated
I have tried to rewrite my .h files. It was primarily an issue about linking SDL and SDL_images.
I have tried to compile the main with gcc main.c -o main -lSDL -lSDL_image.
Here's the CMakeLists.txt
cmake_minimum_required(VERSION 3.7)
project(SOKOBAN)
set(CMAKE_C_STANDARD 99)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -lmingw32")
set(CMAKE_EXE_LINKER_FLAGS "-static-libgcc -static-libstdc++")
include_directories(${PROJECT_SOURCE_DIR}/include)
link_directories(${PROJECT_SOURCE_DIR}/lib)
find_package(SDL REQUIRED)
find_package(SDL)
find_package(SDL_image)
set(SOURCE_FILES main.c jeu.c jeu.h editeur.c editeur.h
fichiers.c fichiers.h Constantes.h hsokoban.h)
add_executable(SOKOBANR ${SOURCE_FILES})
target_link_libraries(SOKOBANR SDL_image SDL)
The error is:
[ 20%] Linking C executable SOKOBANR
CMakeFiles/SOKOBANR.dir/jeu.c.o: In function `jouer':
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:12: multiple definition of `jouer'
CMakeFiles/SOKOBANR.dir/main.c.o:/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:12: first defined here
/usr/bin/ld: skipping incompatible /home/mahamad/github/SOKOBAN/SOKOBAN/lib/libSDL.a when searching for -lSDL
CMakeFiles/SOKOBANR.dir/main.c.o: In function `jouer':
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:72: undefined reference to `deplacerJoueur'
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:76: undefined reference to `deplacerJoueur'
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:80: undefined reference to `deplacerJoueur'
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:84: undefined reference to `deplacerJoueur'
CMakeFiles/SOKOBANR.dir/jeu.c.o: In function `jouer':
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:72: undefined reference to `deplacerJoueur'
CMakeFiles/SOKOBANR.dir/jeu.c.o:/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:76: more undefined references to `deplacerJoueur' follow
CMakeFiles/SOKOBANR.dir/fichiers.c.o: In function `sauvegarderNiveau':
/home/mahamad/github/SOKOBAN/SOKOBAN/fichiers.c:67: undefined reference to `fprint'
collect2: error: ld returned 1 exit status
CMakeFiles/SOKOBANR.dir/build.make:128: recipe for target 'SOKOBANR' failed
make[3]: *** [SOKOBANR] Error 1
CMakeFiles/Makefile2:72: recipe for target 'CMakeFiles/SOKOBANR.dir/all' failed
make[2]: *** [CMakeFiles/SOKOBANR.dir/all] Error 2
CMakeFiles/Makefile2:84: recipe for target 'CMakeFiles/SOKOBANR.dir/rule' failed
make[1]: *** [CMakeFiles/SOKOBANR.dir/rule] Error 2
Makefile:118: recipe for target 'SOKOBANR' failed
make: *** [SOKOBANR] Error 2```
If you get such errors you need to look into each of them:
CMakeFiles/SOKOBANR.dir/jeu.c.o: In function `jouer':
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:12: multiple definition of `jouer'
CMakeFiles/SOKOBANR.dir/main.c.o:/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:12: first defined here
The linker thinks that you have (at least) two definitions of jouer. Since both referenced locations are the same I assume that you 1. include "jeu.c" instead of "jeu.h" in your "main.c", and 2. link both "main.o" and "jeu.o".
/usr/bin/ld: skipping incompatible /home/mahamad/github/SOKOBAN/SOKOBAN/lib/libSDL.a when searching for -lSDL
The library "libSDL.a" you provide is not compatible to the target system. Your target system seems to be Linux.
For which system is the library?
Did you compile it yourself or did you download it?
CMakeFiles/SOKOBANR.dir/main.c.o: In function `jouer':
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:72: undefined reference to `deplacerJoueur'
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:76: undefined reference to `deplacerJoueur'
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:80: undefined reference to `deplacerJoueur'
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:84: undefined reference to `deplacerJoueur'
CMakeFiles/SOKOBANR.dir/jeu.c.o: In function `jouer':
/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:72: undefined reference to `deplacerJoueur'
CMakeFiles/SOKOBANR.dir/jeu.c.o:/home/mahamad/github/SOKOBAN/SOKOBAN/jeu.c:76: more undefined references to `deplacerJoueur' follow
There are references (calls) of deplacerJoueur but you don't define it. Or the source file with the definition (implementation) is not added to the list of modules.
CMakeFiles/SOKOBANR.dir/fichiers.c.o: In function `sauvegarderNiveau':
/home/mahamad/github/SOKOBAN/SOKOBAN/fichiers.c:67: undefined reference to `fprint'
This is clearly a typo. You mean fprintf() with a trailing 'f' for sure.
collect2: error: ld returned 1 exit status
Because of all the errors the linker is not successful, and it tells you.
CMakeFiles/SOKOBANR.dir/build.make:128: recipe for target 'SOKOBANR' failed
Because of all the errors the build is not successful, and it tells you.
I've been trying to compile the Paho MQTT client libraries on raspbian buster. Cloned the github source:
git clone https://github.com/eclipse/paho.mqtt.c.git
As per the README file I've run make (OK except for 1 warning that 'rc1 not used') then sudo make install which happily copies sundry MQTTxx.h and MQTTxx.c files into the /usr/include directory.
However, attempts to compile a Paho demo program results in:
richard#grigio:[~]: gcc mqtest.c
/tmp/ccvjYcVw.o: In function `main':
mqtest.c:(.text+0x68): undefined reference to `MQTTClient_create'
mqtest.c:(.text+0x8c): undefined reference to `MQTTClient_connect'
mqtest.c:(.text+0xe4): undefined reference to `MQTTClient_publishMessage'
mqtest.c:(.text+0x114): undefined reference to `MQTTClient_waitForCompletion'
mqtest.c:(.text+0x138): undefined reference to `MQTTClient_disconnect'
mqtest.c:(.text+0x144): undefined reference to `MQTTClient_destroy'
collect2: error: ld returned 1 exit status
so I thought I needed to link the library:
richard#grigio:[~]: gcc mqtest.c -lMQTTClient
/usr/bin/ld: cannot find -lMQTTClient
collect2: error: ld returned 1 exit status
MQTTClient.h and MQTTClient.c are present in /usr/include so what am I doing wrong, please?
I'm trying to build a C project (krb5) with LLVMGold and LTO in order to output the whole krb5 into an inlined LLVM .bc file.
Following instructions here:
https://llvm.org/docs/GoldPlugin.html
http://gbalats.github.io/2015/12/10/compiling-autotooled-projects-to-LLVM-bitcode.html
I managed to get configure to work with:
export RANLIB=/bin/true
./configure CFLAGS="-flto" LDFLAGS="-flto -fuse-ld=gold -Wl,-plugin-opt=save-temps"
The -save-temps option seems like the one that replaces -also-emit-llvm to output .bc. Now, when I try to run make I get this error:
cc -L../lib -Wl,--enable-new-dtags -Wl,-rpath -Wl,/usr/local/lib -flto -flto -fuse-ld=gold -Wl,-plugin-opt=save-temps -o krb5kdc kdc5_err.o authind.o cammac.o dispatch.o do_as_req.o do_tgs_req.o fast_util.o kdc_util.o kdc_preauth.o kdc_preauth_ec.o kdc_preauth_encts.o main.o policy.o extern.o replay.o kdc_authdata.o kdc_audit.o kdc_transit.o tgs_policy.o kdc_log.o -lapputils -lkadm5srv_mit -lkdb5 -lgssrpc -lgssapi_krb5 -lgssrpc -lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err -lkrb5support -lresolv -ldl -lverto
/usr/bin/ld.gold: error: apputils: no archive symbol table (run ranlib)
krb5kdc.o:ld-temp.o:function main: error: undefined reference to 'loop_init'
krb5kdc.o:ld-temp.o:function main: error: undefined reference to 'loop_add_udp_address'
krb5kdc.o:ld-temp.o:function main: error: undefined reference to 'loop_add_tcp_address'
krb5kdc.o:ld-temp.o:function main: error: undefined reference to 'loop_setup_signals'
krb5kdc.o:ld-temp.o:function main: error: undefined reference to 'loop_setup_network'
krb5kdc.o:ld-temp.o:function main: error: undefined reference to 'loop_free'
krb5kdc.o:ld-temp.o:function create_workers: error: undefined reference to 'loop_setup_signals'
krb5kdc.o:ld-temp.o:function create_workers: error: undefined reference to 'loop_free'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Makefile:699: recipe for target 'krb5kdc' failed
make[1]: *** [krb5kdc] Error 1
make[1]: Leaving directory '/root/src/kdc'
Seems weird as ranlib is not required, I tried running ranlib manually to each .o, .h, .bc files etc like so but doesn't seem to do it. Any ideas?
ranlib: kdc/kdc_util.h: File format not recognized
ranlib: kdc/kdc_util.o: File format not recognized
ranlib: kdc/krb5kdc.0.4.opt.ll: File format not recognized
ranlib: kdc/krb5kdc.0.4.opt.bc: File format not recognized
I'm trying to set up the code from
http://www.openglsuperbible.com/example-code/
with command:
$ cmake -G "Unix Makefiles" ; make clean ; make all
I've installed the following packages in order to prepare the system:
xrandr libxrandr x11-xserver-utils libxrandr-dev libglfw2 libglfw-dev xorg-dev libx11-dev libgl-dev libglu-dev libgl1-mesa-dev freeglut3 freeglut3-dev mesa-common-dev freeglut3-dev build-essential libx11-dev libx11-*
I may have missed some of the packages I've installed in this list, I apologize.
Then I've modified the CMakeList.txt in order to add to the linking phase the following things:
glfw GL rt glut X11 dl Xrandr Xext GLEW GLU
Then I try to compile, but it fails at the linking phase:
/opt/sb6code/src/xraw/xraw.c: In function ‘CreateWindow’:
/opt/sb6code/src/xraw/xraw.c:106:14: warning: assignment makes pointer from integer without a cast [enabled by default]
Linking C executable bin/xraw
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function CreateWindow: error: undefined reference to 'XOpenDisplay'
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function CreateWindow: error: undefined reference to 'XCloseDisplay'
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function CreateWindow: error: undefined reference to 'XCreateColormap'
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function CreateWindow: error: undefined reference to 'XCreateWindow'
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function CreateWindow: error: undefined reference to 'XMapWindow'
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function CreateWindow: error: undefined reference to 'glXCreateContextAttribsARB'
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function Cleanup: error: undefined reference to 'XDestroyWindow'
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function Cleanup: error: undefined reference to 'XCloseDisplay'
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function main: error: undefined reference to 'XNextEvent'
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function main: error: undefined reference to 'XGetWindowAttributes'
collect2: error: ld returned 1 exit status
make[2]: *** [bin/xraw] Errore 1
make[1]: *** [CMakeFiles/xraw.dir/all] Errore 2
make: *** [all] Errore 2
Now, I've tried to search the web and even here on SO.com for solutions, but they keep telling me to link the libraries I've already added to the linking phase.. so I can't seem to make any more progress.
Do you happen to have some knowledge or hint that could help me?
Ok, stimulated by answers I've gone into CMakeFiles directory and looked for the configuration file that manages the compilation. I've found out that for some reasons it did miss some of the flags stated into the CMakeLists despite of my update.
So now the compilation line looks like:
/usr/bin/cc CMakeFiles/xraw.dir/src/xraw/xraw.c.o -o bin/xraw -L/opt/sb6code/lib -rdynamic -lGL -lglut -lGLU -lm -lX11 -ldl -lGLEW -lXrandr -lXext -lrt -lglfw -Wl,-rpath,/opt/sb6code/lib
And the errors have reduced to :
CMakeFiles/xraw.dir/src/xraw/xraw.c.o:xraw.c:function CreateWindow: error: undefined reference to 'glXCreateContextAttribsARB'
collect2: error: ld returned 1 exit status
make[2]: *** [bin/xraw] Errore 1
make[1]: *** [CMakeFiles/xraw.dir/all] Errore 2
make: *** [all] Errore 2
Other hints? :)
Side Note:
I've also installed CUDA libraries and under path
/usr/lib/nvidia-304/
I happen to have
alt_ld.so.conf libnvidia-ml.so.1
bin/ libnvidia-ml.so.304.88
ld.so.conf libnvidia-opencl.so.1
libcuda.so libnvidia-opencl.so.304.88
libcuda.so.1 libnvidia-tls.so.304.88
libcuda.so.304.88 libnvidia-wfb.so.1
libGL.so libnvidia-wfb.so.304.88
libGL.so.1 libOpenCL.so
libGL.so.304.88 libOpenCL.so.1
libnvcuvid.so libOpenCL.so.1.0
libnvcuvid.so.1 libOpenCL.so.1.0.0
libnvcuvid.so.304.88 libXvMCNVIDIA_dynamic.so.1
libnvidia-cfg.so libXvMCNVIDIA.so
libnvidia-cfg.so.1 libXvMCNVIDIA.so.1
libnvidia-cfg.so.304.88 libXvMCNVIDIA.so.304.88
libnvidia-compiler.so tls/
libnvidia-compiler.so.1 vdpau/
libnvidia-compiler.so.304.88 xorg/
libnvidia-glcore.so.304.88 XvMCConfig
libnvidia-ml.so
Which I would like to use since I'm not sure that my intel graphic card supports OpenGl 4.* which I shall use with the book, while the nvidia one supports 4.2.
I really can't find any good how to on the matter, the Book conveniently avoids to give installation instructions.
Temporary Solution:
I've found out that this is the only source file that does not work. Removing its files and CMakeList.txt configuration seems to be wise until someone finds out another solution.
Also, i had to use optirun to run the executables, in case other people with bumblebee/nvidia are wondering why their programs do not work.
You probably link the libraries in wrong order; all these symbols are defined in libX11.a; you should want to see what is the actual linking command line fed to GCC, and post it here.
Update now it means that you are statically trying to link against an API function that is not available in your libs (it is an optional extension and should be queried dynamically).
I had a problem with adding reference in my C application. I am unable to add linker reference to "libiconv" in my data compresser project.I have download "libiconv" library but confuse in adding reference which show error in compiling.I'm using Dev C++ for developing my compression apps.
here is the compile log:
Building Makefile: "C:\Dev-Cpp\Examples\eottest\Makefile.win"
Executing make...
make.exe -f "C:\Dev-Cpp\Examples\eottest\Makefile.win" all
gcc.exe eot.o libeot.o properties.o -o "Project1.exe" -L"C:/Dev-Cpp/lib"
libeot.o(.text+0x19):libeot.c: undefined reference to `libiconv_open'
libeot.o(.text+0x36):libeot.c: undefined reference to `libiconv_close'
libeot.o(.text+0x67):libeot.c: undefined reference to `libiconv'
collect2: ld returned 1 exit status`
You're only specifying an additional library path, not the actual library to link to. Try:
gcc.exe eot.o libeot.o properties.o -o "Project1.exe" -L"C:/Dev-Cpp/lib" -liconv