I download the archive with libconfig, but I do not wont to install it into the system. I want to compile it as static library and link it from program girectory or directly link it into my program on the program compile time?
Any ideas how to do this with Makefile? (FreeBSD(UNIX), GCC)
or suggest other unix config libraries that support compilation into the program.
On linux system untar then configure and make:
> ls
libconfig-1.4.8.tar.gz
> tar -zxvf libconfig-1.4.8.tar.gz
> cd libconfig-1.4.8
> ./configure prefix=/somewhere/in/your/homedir/doesnotmatter
> make
> ls -al lib/.libs
libconfig.a
libconfig++.a
...
other versions of lib
Then link your application against the static .a library.
gcc -I/dir/with/libconfigheader -o yourapp main.cpp libconfig.a
If you don't do make install it will not get installed, the libraries will be in the output directory, you can copy them where you need them.
I hope this helps.
NOTE I haven't tried to use the library, I just downloaded and compiled it ...
Related
I'm compiling a c++ program using g++ and i am using two libraries called libsdl2-dev and libsdl2-image-dev
I installed both these libraries in my ubuntu machine with the commands
apt install libsdl2-dev libsdl2-image-dev and when I compile the program everything works fine. Then I copied these libraries from /usr/lib/x86_64-linux-gnu/ to my working dir with the binary file to be able to give this folder to someone else.
The problem comes when the user that hasn't installed these libraries tries to open my program by writing ./main (the binary file). Since he hasn't installed these libraries he would get an error like "can't open shared object: no such file or directory".
This happens because the binary file looks for these libraries in /usr/lib etc...
What i need
I need that my binary file looks for these libraries in the same folder,and not in /usr/lib/x86 etc.., from what I read I have to do something like rpath
The IDE used is Sublime Text and the syntax used to compile all my files is this:
g++ -c src/*.cpp -std=c++14 -m64 -g -Wall -I include && g++ *.o -o bin/debug/main -lSDL2main -lSDL2 -lSDL2_image && ./bin/debug/main`
Structure of folders
I got the project dir with and inside that i got 4 more directories, each one called: bin (with the debug subdirectory, where we got the final compile), include (with hpp files), res (with all textures), and src with all cpp files to compile, the other files are project files and .o files
I'm using Ubuntu 20.04-2 LTS and the same is for the other user's PC
Thanks in advance for any help!
That's because the dynamic linker loading runtime dependencies looks for them in some specified locations, which are "by default" your system library directories (where those libraries got installed by apt).
The other user should ideally install those libraries too (which could be done "automatically" if you build a .deb package with proper dependencies)
Otherwise you would have to change the runpath of your program by adding -Wl,-rpath='$ORIGIN', which makes the dynamic linker look for dependencies just where the binary is located.
$ORIGIN here is a special variable meaning "this executable" which is what you wanted to achieve.
see rpath
and A description of RPATH $ORIGIN
I found a way to resolve!
I used the program patchelf to add an rpath to my directory (linked to the binary file) now everything works
use ldd ./bin/debug/main to check the library
export LD_LIBRARY_PATH =$LD_LIBRARY_PATH:"your library path"
run the program,if this is not work. use patchelf to change the rpath to you r library
I'm trying to use the wavelet libraries for c++ (https://sourceforge.net/projects/wavelet2d/files/wavelib-0.4.0.0/) on my MacOSx and having hard trouble in making it work.
Here is my command line :
g++ -I /usr/local/include/wavelib -L /usr/local/lib -lwavelet2d testWavelib3.cpp -o testWavelib3
I get the following error :
library not found for -lwavelet2d
The library file is named 'libwavelet2d.so.1' in the directory /usr/local/lib.
Do you have any ideas?
You mention that you have libwavelet2d.so.1 in /usr/local/lib, but not libwavelet2d.so. Typically what this means is that you have installed the "runtime package" for this library but not the "development package". There should be a symlink /usr/local/lib/libwavelet2d.so -> libwavelet2d.so.1.
You can make the symlink yourself to try it:
ln -s libwavelet2d.so.1 /usr/local/lib/libwavelet2d.so
At build time, the file without the version suffix (.1) is required. At runtime, only the suffixed file will be referenced.
Update: issue is solved. The library was Made for Armv7a CPUs but it was "soft float" Not "hard float". It seems like my machine is HF and Not SF compatible
My program depends on an externally build .so library called libMyLib.so. When I compile the program like this:
$ g++ -std=c++11 main.cpp -o run -pthread
it reports that there are a lot of undefined references, obviously because i didn't include libMyLib.so when compiling. So the compiler knows what he needs to compile the program. When i compile the program like this:
$ g++ -std=c++11 main.cpp -o run -pthread -lMyLib
it doesn't report any errors and creates the file "run". Notice that libMyLib.so is already in /usr/local/lib and it looks like it is linked when compiling since the references are defined now and the "run" file is created. But as i run the file, this happens:
$ ./run
./run: error while loading shared libraries: libMyLib.so: cannot open shared object file: No such file or directory
I've checked with ldd and it shows me this:
$ ldd run
...
libMyLib.so => not found
...
So ldd doesn't find the library on execution, but it finds it while compiling. I'm quite new to Linux and linking libraries so i don't know what to do.
Also, running ldd on the .so file returns this:
$ ldd /usr/local/lib/libMyLib.so
not a dynamic executable
I've already checked an this message may occur when running a .so file on the wrong platform. But i've checked, the library is compiled for arm (I'm running on a raspberry pi -> arm):
$ objdump -f /usr/local/lib/libMyLib.so | grep ^architecture
architecture: arm, flags 0x00000150:
I also update the linker:
$ sudo ldconfig -v
...
/usr/local/lib:
libwiringPi.so -> libwiringPi.so.2.44
libwiringPiDev.so -> libwiringPiDev.so.2.44
libMyLib.so -> libMyLib.so.1
...
I really have no clue why this might still happen. Can anyone help me?
/usr/local/lib is one of the directories that the linker searches by default
for libraries specified with the -l option, so your linkage succeeds.
At runtime however, the program loader by default searches for the linked
libraries in:-
/lib, /usr/lib and among the libraries whose names and locations have been cached in the ldconfig cache, /etc/ld.so.cache.
The directories listed in the value of the environment variable LD_LIBRARY_PATH,
in the current shell.
The ldconfig cache is only updated when ldconfig is run. See man ldconfig.
The loader fails to find libMyLib.so at runtime because you have not
run ldconfig since you placed that library in /usr/local/lib and
neither have you correctly added /usr/local/lib to the LD_LIBRARY_PATH
in the same shell in which you try to run the program.
It is inconvenient and otherwise undesirable to require a special setting of
LD_LIBRARY_PATH to enable a program to run.
To enable the loader to find your library, run ldconfig as root. This
will succeed provided that /usr/local/lib is listed in /etc/ld.so.conf,
or in one of the files included by /etc/ld.so.conf. If it's not, then
you can explicitly cache the shared libraries from /usr/local/lib by running
ldconfig /usr/local/lib, as root.
First check LD_LIBRARY_PATH variable is having the path to your library directory
$ echo $LD_LIBRARY_PATH
If not there then update the library path.
$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/path/to/library
Use strace to debug.
strace -f ./run
So I follow the official tutorial for the installation : https://mongodb.github.io/mongo-cxx-driver/mongocxx-v3/installation/
Neverless, I can't use the produced libraries as static.
So I managed to compile the C version of the driver as described, I've enabled the flag --enable-static=yes with the ./configure before doing make && sudo make install and I got the libmongoc-1.0.a and the libbson-1.0.a which are static. So this far, everything it's alright.
Then I have done the cxx version of the driver, except that there is no configuration file as in the C version. So I've juste done a
cmake -DCMAKE_BUILD_TYPE=Release -DBSONCXX_POLY_USE_BOOST=1 -DCMAKE_INSTALL_PREFIX=/usr/local
from the build folder, followed by a make && sudo make install
So I got the libmongocxx.a and the libbsoncxx.a, but when I try to compile with them, I can't run the binary because I got the following error :
error while loading shared libraries: libmongocxx.so._noabi: cannot open shared object file: No such file or directory
So I understand that is because there is some symbols missing and then I need to use the shared library to run the binary but I don't want this to happend, I want the symbols within the binary that I can run it without any LD_PRELOAD.
Any suggestions ?
I had the same issue in an Ubuntu 16.04 and I run a apt-get update & apt-get upgrade and the problem was solved.
It seems that there were some update to the compiler and some libraries that prevent some test from reaching the shared libraries.
I have a similar question, and solved, now I compiled and run my binary with static libs successfully.
I write my build script using newlisp, but the static link options are very helpful, I paste it here.
c++ /to/your/path/site/code/back_end/builder/object/files1.cc.o ... /to/your/path/site/code/back_end/builder/object/files10.cc.o -o bin/site -static-libgcc -static-libstdc++ -L/usr/lib -lpthread -l:libmongocxx.a -l:libbsoncxx.a -l:libmongoc-1.0.a -l:libbson-1.0.a -lrt -lssl -lcrypto -lsasl2 -l:libboost_log.a -l:libboost_log_setup.a -l:libboost_system.a -l:libboost_thread.a -l:libboost_filesystem.a -lcppcms -lbooster -lcurl -ljsoncpp
I am trying to link boost::asio using terminal (I'm also using a text editor).
What I tried
I did some researches on Internet (I didn't found nothing about my distro) - I found I must install that library by executing the following command on the terminal:
sudo pacman -S libboost-all-dev
This is the output I get:
error: the following package was not found: libboost-all-dev
Final question
How can I install and link correctly boost::asio with my .cpp file?
Notes:
I'm using Archlinux
To find a package in Arch Linux, do:
sudo pacman -Ss boost
This will list packages with the string boost. Or, you can look up on the package website: https://www.archlinux.org/packages/extra/x86_64/boost/
One thing you should understand about boost is that a majority of its modules are header-only; if the linker complains about undefined references then you would have to link the required files. To link boost-asio, you would do
g++ -lboost-system <source> <exe>
How to install boost in Arch Linux
You cannot link libraries inside your *.cpp files. You should enumerate required libraries using the -l option in the g++ command line.
g++ -lboos-asio -lboost-system myfile.cpp -o myapp