when I had tried to compile the example code for glfw3 on http://www.glfw.org/documentation.html (copy/pasted to test compilation), I got the following errors:
/tmp/ccCdEKoi.o: In function main':
example.cpp:(.text+0x38): undefined reference toglfwCreateWindow'
example.cpp:(.text+0x5b): undefined reference to glfwMakeContextCurrent'
example.cpp:(.text+0x7a): undefined reference toglfwWindowShouldClose'
collect2: error: ld returned 1 exit status
I am compiling with g++ example.cpp -o example -lGL -lglfw and when I installed the latest glfw 3.0.2, it installed without problems.
GLFW3 builds as libglfw3 by default, not libglfw as GLFW2 did. So you're probably still linking against your GLFW2 installation.
Solution:
g++ example.cpp -o example -lGL -lglfw3
Related
When I build a simple C++ program with glog library (Google's logging library which is not used in the code), I get "undefined reference" errors. When I remove the -lglog from the build command, the link succeeds.
Notice that the library that I added to the link is not used in the code at all and despite that it caused the build to fail. In addition, the glog and log4cpp libraries are supposed to be independent.
Can you explain this unusual behavior?
Environment: Ubuntu 14.04
Code:
//test.cpp
#include "log4cpp/Appender.hh"
#include "log4cpp/FileAppender.hh"
int main() {
log4cpp::Appender *appender;
appender = new log4cpp::FileAppender("default", "program.log");
return 0;
}
Working build command:
$ g++ test.cpp -llog4cpp -lpthread
Failing build command:
$ g++ test.cpp -llog4cpp -lglog -lpthread
//usr/local/lib/liblog4cpp.so: undefined reference to `pthread_key_create'
//usr/local/lib/liblog4cpp.so: undefined reference to `pthread_getspecific'
//usr/local/lib/liblog4cpp.so: undefined reference to `pthread_key_delete'
//usr/local/lib/liblog4cpp.so: undefined reference to `pthread_setspecific'
collect2: error: ld returned 1 exit status
EDIT:
This command also builds successfully:
g++ test.cpp -llog4cpp -lpthread -lglog
This command fails (change the order of libs):
$ g++ test.cpp -llog4cpp -lglog -lpthread
//usr/local/lib/liblog4cpp.so: undefined reference to `pthread_key_create'
//usr/local/lib/liblog4cpp.so: undefined reference to `pthread_getspecific'
//usr/local/lib/liblog4cpp.so: undefined reference to `pthread_key_delete'
//usr/local/lib/liblog4cpp.so: undefined reference to `pthread_setspecific'
collect2: error: ld returned 1 exit status
This succeeds:
$ g++ test.cpp -pthread -llog4cpp
This fails:
$ g++ test.cpp -pthread -llog4cpp -lglog
EDIT 2:
I studied the duplicate suggestions (1) and (2) to find out maybe there's something useful to me there, but it turned out irrelevant because these cases doesn't address the situation where a library that is not used in the code is added to the link and make it fail.
EDIT 3:
The files from my environment (glog libs, log4cpp libs, used log4cpp headers and test.cpp): log_test.zip.
I installed Protobuf in MinGW from the sources on github.
When I try to compile my C++ program I get errors:
CMakeFiles/nxcore_interface.dir/main.cpp.o:main.cpp:(.rdata$.refptr._ZN6google8protobuf8internal13empty_string_E[.refptr._ZN6google8protobuf8internal13empty_string_E]+0x0): undefined reference to `google::protobuf::internal::empty_string_'
collect2: error: ld returned 1 exit status
I found something that indicates the development libs are not present:
Program with protocol-buffers don't compile with MinGW-w64: "undefined reference to google::protobuf:: ..."
I have included the -lprotobuf compiler flag.
After some searching I determined I need to use libprotobuf-dev but I am having trouble locating it.
Does anyone know where to get it, or is something else wrong?
You should compile your application with pkg-config.
g++ my_program.cpp `pkg-config --cflags --libs protobuf`
If you don't have pkg-config you should locate libraries path and set them with -L option. Eg:
g++ my_program.cpp -L/usr/local/protobuf/lib -lprotobuf
I have compiled libcurl using mingw32 and am trying to link it with my program using mingw32 for a Windows system from my Linux machine.
I was outputted the files, libcurl-4.dll libcurl.a libcurl.la libcurl.lai.
I have included them in my mingw32 libs folder at: /usr/x86_64-w64-mingw32/lib
I was able to find a few other topics on linking with the libstdc++ and libgcc to take care dependency errors while executed but when trying to add libcurl.a it will not compile period.
I used the following:
$ x86_64-w64-mingw32-g++ main.cpp -o hello.exe -static-libgcc -static-libstdc++ -static "/usr/x86_64-w64-mingw32/lib/libcurl.a" -lpthread
However, I cannot not get it to use the libcurl.a and am continuing to receive these errors.
/tmp/ccIceRus.o:main.cpp:(.text+0xde): undefined reference to `__imp_curl_easy_init'
/tmp/ccIceRus.o:main.cpp:(.text+0x106): undefined reference to `__imp_curl_easy_setopt'
/tmp/ccIceRus.o:main.cpp:(.text+0x122): undefined reference to `__imp_curl_easy_setopt'
/tmp/ccIceRus.o:main.cpp:(.text+0x13e): undefined reference to `__imp_curl_easy_setopt'
/tmp/ccIceRus.o:main.cpp:(.text+0x159): undefined reference to `__imp_curl_easy_setopt'
/tmp/ccIceRus.o:main.cpp:(.text+0x169): undefined reference to `__imp_curl_easy_perform'
/tmp/ccIceRus.o:main.cpp:(.text+0x180): undefined reference to `__imp_curl_easy_strerror'
/tmp/ccIceRus.o:main.cpp:(.text+0x197): undefined reference to `__imp_curl_easy_cleanup'
/usr/bin/x86_64-w64-mingw32-ld: /tmp/ccIceRus.o: bad reloc address 0x80 in section `.xdata'
collect2: error: ld returned 1 exit status
What am I doing wrong?. I can not get past this. I know it has to be some stupid issue.
Thank you.
I was able to solve the question by specifying -DCURL_STATICLIB, as well as linking some other dependencies.
x86_64-w64-mingw32-g++ main.cpp -o hello.exe -DCURL_STATICLIB -static -lstdc++ -lgcc -lpthread -lcurl -lwldap32 -lws2_32
I am trying to compile a simple boost program which uses threading on ubuntu 14.04 ( using boost 1.54 ).
the output of compilation is like this:
09:30:25 **** Incremental Build of configuration Debug for project sdkTest ****
make all
Building target: sdkTest
Invoking: GCC C++ Linker
g++ -L"/home/khan/git/sdkLinux/libFingiSdk/Debug" -o "sdkTest" ./src/CommunicationCoreTest.o ./src/CoreTest.o ./src/LoggerTest.o ./src/ProgramOptions.o ./src/sdkTest.o -lfingidevicesdk -lz -lssl -lcurl -lpthread -lboost_system -lboost_regex -lboost_signals -lboost_thread -lboost_chrono -lboost_program_options -lboost_filesystem -lboost_iostreams -lboost_unit_test_framework -lpython2.7 -lboost_python
/home/khan/git/sdkLinux/libFingiSdk/Debug/libfingidevicesdk.so: undefined reference to `boost::thread::get_id() const'
/home/khan/git/sdkLinux/libFingiSdk/Debug/libfingidevicesdk.so: undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)'
/home/khan/git/sdkLinux/libFingiSdk/Debug/libfingidevicesdk.so: undefined reference to `boost::thread::join()'
collect2: error: ld returned 1 exit status
make: *** [sdkTest] Error 1
09:30:25 Build Finished (took 413ms)
i have install boost by using
sudo apt-get install libboost-all-dev
and in the compilation i have added reference to libboost_thread , pthread and so on. ( infact this used to compile fine on ubuntu 12.10,boost 1.48).
Any idea what could be wrong here?
/home/khan/git/sdkLinux/libFingiSdk/Debug/libfingidevicesdk.so: undefined reference to `boost::thread::get_id() const'
You need to link libfingidevicesdk.so with the boost thread library as well.
It was a long long way, but I managed to include a shared file (libpi_pi_gcs2.so) included into C++ code under Linux Mint 17 Cinnamon 64-bit. Now as the dust is saddled I have a question left... let me summarize:
I copied libpi_pi_gcs2.so in usr/local/lib.
Trying to compile main.cpp with
g++ -Wall -o test main.cpp -lpi_pi_gcs2
faild, returning
/usr/bin/ld: skipping incompatible //usr/local/lib/libpi_pi_gcs2.so when searching for -lpi_pi_gcs2
/usr/bin/ld: cannot find -lpi_pi_gcs2
collect2: error: ld returned 1 exit status
I talked with my flatmate, and he guessed maybe the shared library is only 32bit compatible.
Using -m32 let me take a step forward! But yielding new errors.
I googled and it seemed like I needed C32 std libraries. And I installed:
apt-get install ia32-libs
Again the old error messages disappeared and new one arose, after googling around I installed:
apt-get install g++-multilib
Trying to compile it now using
g++ -Wall -o test -m32 main.cpp -lpi_pi_gcs2
Let to the error messages:
//usr/local/lib/libpi_pi_gcs2.so: undefined reference to `dlsym'
//usr/local/lib/libpi_pi_gcs2.so: undefined reference to `dlopen'
//usr/local/lib/libpi_pi_gcs2.so: undefined reference to `dlclose'
The solution was the following command:
g++ -Wall -o test -m32 main.cpp -lpi_pi_gcs2 -ldl
Now my question:
Is it necessary to explicitly state -ldl i.e. link with libdl.so because the -m32 flag declares everything what follows to be 32bit and hence the linker would without explicitly
writing -ldl search for a 32bit libdl.so? I guess mine is 64 bit I am working on a 64bit system.
What do you think? More details and background informations are appreciated.
Greetings,
newandlost