I have a project in which I need to create an executable file. In the makefile which has the rules for this executable I have this:
LIBS=-lws2_32 -llibrary -llua53 -ldwarf -lz -lelf
When I try to create the executable by running the make command I get the following error:
> c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/bin/ld.exe:
> cannot find -lz
Now as I understand -lz is for specifing to include the zlib library. I have that installed on my system. Still I get the error. Do I need to include some path in my env variables? I have searched a lot but found no answer. Please help me correct this. Thank you!
You could add -L<path> before the -lz command where points to the location of libz.a and/or libz.dll.a.
Related
probably this is a trivial newbie question, however, I can't figure out how to solve it.
I'm trying to build a test program using libtiff (test program copied from here). I've downloaded the static library libtiff.lib as well as the required header file tiffio.h. When I compile the main c function with no problem I have a main.o file. When I try to link main.o with libtiff using this command
gcc -g -Wall -o test.exe ./libtiff.lib ./test.o
I have this error:
undefined reference to `_imp__TIFFOpen'
I've looked into the lib file with nm -A libtiff.lib command and I can find this line
libtiff.lib:libtiff3.dll:00000000 I __imp__TIFFOpen
but it has 2 leading underscores instead of 1 as required by the linker. I'm using mingw on Windows 7 and all the required files are in the same directory.
No clue how to link with no errors.
Thanks in advance.
As suggested in the the comments, it was sufficient to invert the order of objects passed as arguments:
gcc -g -Wall -o test.exe ./test.o ./libtiff.lib
I have the following .sh file (from here).
g++ -c -pipe -g -std=gnu++11 -Wall -W -fPIC -I. -I./tensorflow
-I./tensorflow/bazel-tensorflow/external/eigen_archive -I./tensorflow/bazel-tensorflow/external/protobuf/src -I./tensorflow/bazel-genfiles -o main.o ./main.cpp
g++ -o Tutorial main.o -L./tensorflow/bazel-bin/tensorflow
-ltensorflow_cc
cp ./tensorflow/bazel-bin/tensorflow/libtensorflow* .
When I try to run this .sh file from terminal I got an error. Therefore I executed the commands one by one. First one worked fine and I saw that when I run the second command ( g++ -o Tutorial main.o -L./tensorflow/bazel-bin/tensorflow
-ltensorflow_cc) I get the following error.
/usr/bin/ld: main.o: undefined reference to symbol '_ZN10tensorflow3Env19NewRandomAccessFileERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPSt10unique_ptrINS_16RandomAccessFileESt14default_deleteISA_EE'
libtensorflow_framework.so: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
I saw the answer here and I see it as closely related to mine. But I cannot figure out how to adapt it to my problem.
Can someone please help with this?
The linker is saying that the linkage requires shared library libtensorflow_framework.so (presumably because -ltensorflow_cc depends on it and requests it) but is not given in your commandline. This should be solved by adding -ltensorflow_framework at the end, with an additional -L option if necessary.
I was too getting the same error.
If you are using tensorflow 2, then you need to link .so.2 files. You should find them in the bazel build directory. For me it is :
/tmp/bazel/output/execroot/org_tensorflow/bazel-out/k8-opt/bin/tensorflow
I linked the files using the below in my CMAKE:
file(GLOB LIBRARIES "${bazel_bin}/tensorflow/*.so.2")
message("LIBRARIES = ${LIBRARIES}")
I need to include libexplain to my project to do certain job. I install it and add the header libexplain/read.h to my code, so far so good and no error reported by the complier. But when I use the function explain_read() provided by libexplain and build the project it says:
/tmp/cc7NjAw0.o: In function `xl45_read(int, unsigned char*)':
connections.cpp:(.text+0x2f): undefined reference to `explain_read'
collect2: error: ld returned 1 exit status
and the build script is:
#!/bin/bash
echo > ./stdafx.h
g++ -O1 -Wall -o ./local_proxy (*.cpp...here is the source file list) -lz -lpthread -lpcap -L/usr/local/lib
actually when I type
whereis libexplain
in terminal, I get
libexplain: /usr/lib/libexplain.so /usr/lib/libexplain.a /usr/include/libexplain
I do a lot of searches and still have no idea what's going wrong. ):
You need to link your object files with libexplain. You can do it using the -l<library name>, like so:
g++ -O1 -Wall -o ./local_proxy *.cpp -lz -lpthread -lpcap -lexplain -L/usr/local/lib
Note the -lexplain flag. For a library with the a file name like libABC.so, you'd use -lABC to refer to that library. The documentation for link options with GCC can shed more light on it.
I'm trying to compile some c code via make with gcc, but I keep getting:
/usr/bin/ld: cannot find -lnetlink
I have -lnetlink included in the gcc make parameters. Using locate netlink is able to find multiple items. I've even told gcc exactly where to find one by using -L/usr/include/linux, but it still gives the error.
The gcc command arguments below:
gcc -g -ggdb -Wall -Wextra -o mt6d mt6d.o address_worker.o tunnel_worker.o mt6d_assoc.o addr_gen.o send_utils.o if_utils.o tun_utils.o icmp_utils.o utils.o -lcrypto -lssl -lnetlink -lpthread -lnetfilter_queue
I've also been having errors with libnetlink.h, but was able to get them resolved, but I've included that here if that might be related and this error appears immediately after the other was fixed. Fixed by using C_INCLUDE_PATH
I've recently upgraded to Ubuntu 13.04 and was using 11.04 before that.
Let me know if you need any more information. Any help would be greatly appreciated!
Thanks,
-Alan
I'm trying to compile some c code via make with gcc, but I keep getting:
Technically, this stage is called linking. That difference may seem subtle at first, but it's a really important one and can help frame the investigation when problems like this arise.
You should not reference /usr/include paths with -L. -L adds to the search path for libraries and generally only header files should show up under /usr/include.
libnl enables pkg-config, so you should use that.
For example (assuming you have libnl-3-dev installed):
gcc -o my_executable $(pkg-config --libs libnl-3.0) my_foo.o my_bar.o
In a Makefile, you could do the following to achieve that effect:
LDLIBS+=$(shell pkg-config --libs libnl-3.0)
CFLAGS+=$(shell pkg-config --cflags libnl-3.0)
This probably very easy when you know how, but I don't :)
I'm trying to build some code that takes uses opengl/glut. I'm using the cygwin version of cmake opengl etc. The only reference I see to opengl/gult is in the CMakeLists.txt:
find_package(OpenGL REQUIRED)
find_package(GLU REQUIRED)
find_package(GLUT REQUIRED)
Everything works fine up till the linking stage, which ends with:
CMakeFiles/glview.dir/glview.c.o: In function `DrawGLScene': /cygdrive/C/code/libfreenect/examples/glview.c:88: undefined reference to `__imp__glutSwapBuffers#0'
CMakeFiles/glview.dir/glview.c.o: In function `keyPressed': /cygdrive/C/code/libfreenect/examples/glview.c:96: undefined reference to `__imp
etc.
After a git of googling I figured out this because cmake is feading the linker a -lglut flag, when it should be feading it a -lgut32 flag. By manually executing the linking command, I can get the program to build:
/usr/bin/gcc.exe -Wall -O3 -g -Wl,--enable-auto-import CMakeFiles/glview.dir/glview.c.o -o glview.exe -Wl,--out-implib,libglview.dll.a -Wl,--major-image-version,0,--minor-image-version,0 -L/cygdrive/C/code/libfreenect/lib ../lib/libfreenect.a -lGL -lGLU -lglut32 -lm -lpthread -lusb-1.0
But I can't figure out how to get cmake to generate this command for me so no manual steps are needed. Any ideas what I should be doing?
Cheers,
Rob
this is how to add libraries to link to:
target_link_libraries( ${TargetName} gut32 )
find_package only assures the package is found, no more.