I have tried the tutorial from http://coding-robin.de/2013/07/22/train-your-own-opencv-haar-classifier.html
I got error while run this command:
g++ `pkg-config --libs --cflags opencv` -I. -o mergevec mergevec.cpp\
cvboost.cpp cvcommon.cpp cvsamples.cpp cvhaarclassifier.cpp\
cvhaartraining.cpp\ -lopencv_core -lopencv_calib3d -lopencv_imgproc -lopencv_highgui -lopencv_objdetect
the error message :
g++: error: mergevec.cppcvboost.cpp: No such file or directory
g++: error: cvhaarclassifier.cppcvhaartraining.cpp-lopencv_core: No such file or directory
then I tried to run the command like this:
g++ `pkg-config --libs --cflags opencv` -I. -o mergevec mergevec.cpp
cvboost.cpp cvcommon.cpp cvsamples.cpp cvhaarclassifier.cpp
cvhaartraining.cpp -lopencv_core -lopencv_calib3d -lopencv_highui -lopencv_objdetect/
and still met the error message like this:
/usr/bin/ld: cannot find -lopencv_highui
/usr/bin/ld: cannot find -lopencv_objdetect/
collect2: error: ld returned 1 exit status
can anyone help me? thank you for your help
I had the same problem when scaling OpenCV haar up and down on different arch's of Ubuntu on EC2 until I found this python version of mergevec in github: https://github.com/wulfebw/mergevec created by wulfebw
It did the trick.
Just use the python version instead of compiling the one in the tutorial. As long as your OpenCV libraries are installed correctly with python, it should work.
Related
I'm on a linux system (arch linux specifically) and I'm trying to compile the introduction project from the official glfw page but I cannot seem to get gcc to compile it. If anyone doesn't know what I'm talking about it's this.
Also this is how I'm trying to compile it:
gcc -Iinclude test.c -o test -lglfw3 -lm -lGL -lGLU
and it gives me the following errors:
/usr/bin/ld: cannot find -lglfw3
collect2: error: ld returned 1 exit status
I completely forgot about this question until I got a notification for it. For me the solution was to not use -lglfw3 but rather use -lglfw
If you've installed pkg-config, and glfw3.pc is in the search path, try:
gcc -Iinclude test.c -o test `pkg-config --libs glfw3` -lm -lGL -lGLU
If you only have the static build, use: pkg-config --static --libs glfw3, which will add the dependencies that libglfw3.a requires.
Find libglfw3.a or libglfw3.so on your system
Mention that path to gcc using -L
gcc -Iinclude test.c -o test -L/dir/where/glfw3/resides -lglfw3 -lm -lGL -lGLU
After much research, trying to find out how to link libraries to gcc, going to /usr/bin and /usr/lib confirming the stuff are there. When I try to compile my keygen file, this is the error it blurts out.
$ gcc keygen.c -W -Wall /usr/bin/libgcrypt-config
/usr/bin/libgcrypt-config: file not recognized: File format not recognized
collect2: error: ld returned 1 exit status
I've been told by numerous sources that I should compile this way to check if libgcrypt installed correctly.
$ gcc -o foo foo.c 'libgcrypt-config --cflags --libs'
But everytime I try to do that this is what it blurts out:
gcc: error: libgcrypt-config --cflags --libs: No such file or directory
I've confirmed that libgcrypt20 and libgcrypt20-dev are installed using dpkg --get-selections>installed. But I am just so utterly confused as to what may be wrong.
Any form of help would be much appreciated.
Try:
$ gcc -o foo foo.c `libgcrypt-config --cflags --libs`
` instead of '
I follow the ffmpeg tuorial, and install ffmpeg via ppa
But when I compiled the tuorial02.c, I got gcc error:
/usr/bin/ld: /opt/ffmpeg/lib//libavcodec.a(libvorbisenc.o): undefined reference to symbol 'vorbis_encode_setup_vbr'
//usr/lib/x86_64-linux-gnu/libvorbisenc.so.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
My compile command is:
gcc -I /opt/ffmpeg/include/ -L /opt/ffmpeg/lib/ -o tutorial02 tutorial02.c -lavformat -lavcodec -lswscale `sdl-config --cflags --libs` -lpthread -lz -lm -ldl
I have searched the reason for hours. I can't solve this. Can anyone help me?
Added I have add -lvorbisenc to the end. the error is lib not found. and libvorivisenc2 has been install. so this question is not a duplicate of Strange linking error: DSO missing from command line
And My OS is Linux mint 17.3
The error is telling you that the static library libavcodec.a references symbols from libvorbisenc but libvorbisenc isn't explicitly in your link command (though it did find a good candidate from another shared library in the link command). You'll need to add -lvorbisenc or $(pkg-config --libs vorbisenc) explicitly to your command line.
(Older versions of binutils would let you bring in shared libraries implicitly in this situation; however, newer versions of binutils are stricter.)
I am trying to resurrect on old OpenGL program on a Linux Mint system. I installed freeglut3-dev using Synaptic Package Manager. The compiler does not complain about not being able to find the glut include file anymore, but now I have other problems:
cc -Wall -o gears main.c draw_gears.c gl_drawing.c load_data.c normal.c prep_data.c -lglut
/usr/bin/ld: /tmp/ccfNsT0O.o: undefined reference to symbol 'glNewList'
//usr/lib/i386-linux-gnu/mesa/libGL.so.1: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make: *** [gears] Error 1
Try this:
cc -Wall -o gears main.c draw_gears.c gl_drawing.c load_data.c normal.c prep_data.c -lglut -lGLU -lGL
I'm trying to use someone else's Makefile to complile a very simple c++ library. The makefile is as follows:
JNIFLAGS=-O2 -pthread -I/usr/lib/jvm/java-6-sun/include -I/usr/lib/jvm/java-6-sun/include/linux
all:
rm -f ../dist/libUtils.so
g++ $(JNIFLAGS) -c -m32 -o com_markets_utils_dates_NativeTime.o com_markets_utils_dates_NativeTime.cpp
g++ $(JNIFLAGS) -c -m32 -o DateUtil.o DateUtil.cpp
g++ -pthread -m32 -shared -fPIC -o ../dist/libUtils.so DateUtil.cpp
g++ -pthread -m32 -shared -fPIC -o ../dist/libNativeTime.so DateUtil.o com_markets_utils_dates_NativeTime.o
This compiles fine, but the linker complains:
...
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.a when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.a when searching for -lstdc++
/usr/bin/ld: cannot find -lstdc++
collect2: ld returned 1 exit status
make: *** [all] Error 1
FYI, I am on Ubuntu 9.10 64bit.
Posting for future reference, a solution I found was to install g++-multilib. I had the same incompatible problem relating to -lstdc++ on g++ version 4.6.1
On further probing: g++-multilib is a dummy package which installed g++4.6-multilib which in turn installed the appropriate libstdc++.so under the /usr/lib/gcc/x86_64-linux-gnu/4.6/32 folder.
Answering my own question:
Ths solution seems to be a bit of a hack, you need to create a symlink for the 32 bit version of the library (after installing the packages mentioned in #nos's answer):
$ sudo ln -s /usr/lib32/libstdc++.so.6 /usr/lib32/libstdc++.so
Once you've done this, the linker will automagically find the correct library to use.
It seems you're compiling a 32 bit library on a 64 bit machine, however a 32 bit version of libstdc++ is not present.
Try apt-get install ia32-libs libc6-i386 libc6-dev-i386 lib32gcc1 lib32stdc++6
(btw. you're producing a .so , you should specify -fPIC when compiling your .cpp files as well)