I am trying to debug why protobuf is not being linked in my C++ project.
So I tried this in cygwin:
$ gcc -libprotobuf
/usr/lib/gcc/x86_64-pc-cygwin/4.9.3/../../../../x86_64-pc-cygwin/bin/ld: cannot find -libprotobuf
collect2: error: ld returned 1 exit status
I built and installed protobuf on cygwin.
it should be -lprotobuf, find libprotobuf.so in /usr/lib or /usr/lib64/
Related
I am trying to compile qt-dab by using the command line:
qmake qt-dab.pro
make
But I get these error messages:
/usr/bin/ld : ne peut trouver -lqwt-qt5
collect2: error: ld returned 1 exit status
make: *** [linux-bin/qt-dab-0.998] Erreur 1
"qmake -v" gives me QMake version 3.0 using Qt version 5.2.1 in /usr/lib/x86_64-linux-gnu.
Moreover, I installed the qwt-6.1.3 library. Is there a solution for this?
The linker can not find the library: qwt-qt5.
If you've installed the qwt library, you will want to find where it is located.
It sounds like you may have installed version 6 of the library,
but are trying to link with version 5 (which may be non-existent on your machine).
When you find the correct library on your system, you can tell the linker which to directories to search for it using the -L flag.
I've attempted to build g++ v5.1.0 on my Centos 6 system. The build seems to have worked, but when I try to compile and >link< a program, the linker fails thus:
[seesdev#sees15-lin ~]$ g++ -o testcpp testcpp.cpp
/usr/bin/ld: unrecognized option '-plugin'
/usr/bin/ld: use the --help option for usage information
collect2: error: ld returned 1 exit status
Do I have to get a newer version of "ld"? How?
PROBLEM SOLVED:::
I am using LEDA library in c++.
command used to make object file.
g++ -I$LEDAROOT/incl -c mult.cpp
this command runs fine
I am getting eroor while linking step.
HERE IS THE EROOR
varun#Kinley:~/Documents/LEDA/test/numbers$ g++ -L$LEDAROOT mult.o -lleda -lX11 -lm
/usr/bin/ld: cannot find -lX11
collect2: error: ld returned 1 exit status
I think I need to install some package,because when I googled this error the most of problems are solved by installing some package .
I didn't find lx11 error
some of the eroor messages that I googled.
error 1
/usr/bin/ld: cannot find -lfreetype collect2: ld returned 1 exit
status
error 2
/usr/bin/ld: cannot find -lz collect2: ld returned 1 exit status
Links where I find these posts
http://www.qtcentre.org/threads/21069-collect2-ld-returned-1-exit-status
http://www.cyberciti.biz/faq/centos-rhel-redhat-usrbinld-cannot-findlc-error/
Do I need to install some package or there is some other problem
Could be two things
1) The X11 library is installed in a non-standard path. Use the search command to see if libX11.a or libX11.so is available on your system. If yes add the directory path to the -L option.
2) You are missing the libX11 library.
In this case, login as admin and use yum (assuming linux) to install this library.
Eg:
"yum install libX11.i386" or "yum install libX11.x86_64", depending on your architecture (32 bit or 64 bit).
I am following the instructions on
http://tayefeh.wordpress.com/2009/07/06/creating-and-using-a-c-shared-library-with-eclipse-cdt-galileo-and-gnu-c-compiler-and-linker/
to build a shared library.
I have got to Step II, bullet point 16 but my attempts to build the project fail with the following error:
**** Build of configuration Debug for project UseDLL ****
make all
Building target: UseDLL
Invoking: GCC C++ Linker
g++ -L"/home/ken/workspace/testlib/Debug" -o"UseDLL" ./src/UseDLL.o -ltestlib -l/home/ken/workspace/testlib/Debug
/usr/bin/ld: cannot find -l/home/ken/workspace/testlib/Debug
collect2: ld returned 1 exit status
make: *** [UseDLL] Error 1
Can anyone advise why the build is failing? The directory does exist and ls shows
[ken#localhost Debug]$ ls /home/ken/workspace/testlib/Debug/
libtestlib.so TestClass.o
If it helps, I am running CentOS 6.3.
Thanks,
Ken
You should remove this:
-l/home/ken/workspace/testlib/Debug
It makes g++ look for a library of that name.
I am trying to use LLVM as backend for my compiler, and while linking with the llvm libraries, I get this error
g++ obj/*.o `llvm-config --ldflags core jit native` `llvm-config --libs core jit native` -lfl -o Icarus
/usr/bin/ld: cannot find -lffi
collect2: ld returned 1 exit status
I have installed llvm on my system and my cpp files compile fine. Its during linking that the library its searching can't be found.
If on a deb system try installing the dev libs, they solved the problem for me:
sudo apt-get install libffi-dev
Hmm. Did you install libffi too?
ftp://sourceware.org/pub/libffi/libffi-3.0.10.tar.gz
I know that installing libffi into /usr prefix helped me, when ld complained about being unable to find -ffi