I know there are sevareal answers about this topic, but certainly, I do not understand them.
[Linux | ubuntu 20.04 | cmake 3.23]
The problem is that while building a shared library with cmake, when I link this library to an executable, the library is founded [tested with ldd command]. But when i install the project my executable in /bin folder, cant find my library in lib directory.
The error is:
./my_executable.exe: error while loading shared libraries: libCOOK.so: cannot open shared object file: No such file or directory
Program directory
src/
exes/
my_exe.f90
libraries/
COOK.c
Install directory
-lib/
libCOOK.so
-bin/
my_executable.exe
-include/
My own answer:
Just add the install_directory/lib to the LD_LIBRARY_PATH
Related
I've installed boost-1.68.0 under windows into "C:\boost". When I try to compile simple program using boost/geometry.hpp, mingw throws an error:
fatal error: boost/geometry.hpp: No such file or directory
I've tried this:
g++ example.cpp -o example.exe -I"C:\boost\include\boost-1_68" -L"C:\boost\lib"
It appeared that installation of boost was not completed properly despite of the fact that no errors was showed during the process.
There were no *.hpp files in "C:\boost\include" directory, just the structure of empty folders.
The problem was solved by manually coping same boost folder with *.hpp from downloaded install package.
When i try to run cmake to build a project where i include the SFML library i get the following Error: SFML found but version too low (requested: 2.4, found: 1.x.x)
I downloaded only the source of the newest Version of the library (SFML-2.4.2). I than run cmake (with MinGW Makefiles) And build the binaries into the same folder.
I copied the FindSFML into an subfolder of my project.
After that i had the following folder structure
SFML-2.4.2\
cmake\
Modules\
FindSFML.cmake
CMakeFiles
doc
...
include
lib
src
..
sfml-games\
tetris\
cmake_modules\
FindSFML.cmake
CMakeLists.txt
main.cpp
tetris-build
...
My CMakeLists.txt contains the following stuff:
project(Tetris)
cmake_minimum_required(VERSION 2.8)
aux_source_directory(. SRC_LIST)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake_modules")
Find_package(SFML 2 REQUIRED system window graphics network audio)
include_directories(${SFML_INCLUDE_DIR})
add_executable(${PROJECT_NAME} ${SRC_LIST})
target_link_libraries(${PROJECT_NAME} ${SFML_LIBRARY})
I found that in cmake the entry CMAKE_INSTALL_PREFIX (which i dont get) is set to C:\Program Files (x86)\SFML so i put the library and the lib of SFML into C:\Program Files (x86)\SFML. (what is that CMAKE_INSTALL_PREFIX and should i realy always copy the library and lib folders into my C:\Program Files (x86)\ ??). Now my cmake runs through but when i try to compile the code i get a lot of undifined references to '_imp__....'
By the way on linux i just installed SFML via sudo apt-get install libsfml-dev and it works out of the box.
You're confusing things. CMAKE_INSTALL_PREFIX is the default location where to put SFML when you build the install target (i.e. running make install). This has nothing to do with your other issues.
You don't have to install SFML (or any other library) somewhere under C:\Program Files. That's completely up to you.
What I found to be rather neat is installing MinGW to C:\usr (or creating a symlink to your installation folder) and also use that path for CMAKE_INSTALL_PREFIX when building SFML.
This way MinGW should behave pretty much the way you're used to from Linux (i.e. not having to specify paths for include dir or libraries etc.).
As for your undefined reference errors, you should create a new question only asking for these (and then include at least a few of them), as they have nothing to do with the installation directory.
Right now I can only guess, but it's most likely due to you using the wrong CMake variables for the linker. You won't notice this on Linux, since SFML will be in the default search path (which will also happen if you use C:\usr as described above).
To try fixing this, use this line:
target_link_libraries(${PROJECT_NAME} ${SFML_LIBRARIES} ${SFML_DEPENDENCIES})
I get this error when I'm using Cygwin on a "makefile":
"boost/filesystem.hpp: No such file or directory compilation terminated."
This is everything that's inside the "makefile":
mnisten: src/main.cpp g++ -Wall -O2 -lboost_filesystem-mt -std=c++0x -o mnisten src/main.cpp
And inside the "main.cpp" file, this is the line of code that the error message is referring to:
#include <boost/filesystem.hpp>
First I tried to put the "boost" folder (containing "filesystem.hpp") inside the "src" folder, but the error message was unchanged, I still got the same error message.
Then I changed the "include" code inside "main.cpp" to:
#include <filesystem.hpp>
I also copied the "filesystem.hpp" file into the root of the "src" folder, and surprisingly this worked. I got a new error, but I got past the "include" part.
I find it very confusing that it I get an error when the file is in a folder, but when it is in the root of the "src" folder it works.
Any suggestions on how I can get it to work when the file is inside the "boost" folder?
(I downloaded the the "filesystem.hpp" since it was not included)
To find the cygwin package that contains a given file you can use cygcheck -p
$ cygcheck -p boost/filesystem.hpp
Found 6 matches for boost/filesystem.hpp
libboost-devel-1.60.0-1 - libboost-devel: Boost C++ libraries (installed binaries and support files)
libboost-devel-1.60.0-2 - libboost-devel: Boost C++ libraries (installed binaries and support files)
mingw64-i686-boost-1.60.0-1 - mingw64-i686-boost: Boost C++ libraries for Win32 toolchain (installed binaries and support files)
mingw64-i686-boost-1.60.0-2 - mingw64-i686-boost: Boost C++ libraries for Win32 toolchain (installed binaries and support files)
mingw64-x86_64-boost-1.60.0-1 - mingw64-x86_64-boost: Boost C++ libraries for Win64 toolchain (installed binaries and support files)
mingw64-x86_64-boost-1.60.0-2 - mingw64-x86_64-boost: Boost C++ libraries for Win64 toolchain (installed binaries and support files)
so you need to install libboost-devel as you are not crosscompiling for mingw64.
Similar for
$ cygcheck -p opencv/cv.hpp
Found 1 matches for opencv/cv.hpp
libopencv-devel-2.4.11-1 - libopencv-devel: Real-time computer vision library (development) (installed binaries and support files)
Probably you don't have any boost installed in your system. I got this error and solved by installing it.
sudo apt-get install libboost-all-dev
I have an OSX 10.7 computer with a non-administrator account, and was attempting to install the pre-compiled versions of gcc and g++ found here. I've attempted to use the answers presented in these questions (three different links) to compile some code with g++, to confusing avail. I have a folder structure like this:
~/code/:
usr/:
local/:
bin/ (3.6MB)
include/ (8.6MB)
lib/ (51MB)
libexec/ (49MB)
share/ (16MB)
c++/:
source/ (contains .cpp files)
g++ -v returns this:
code USER$ usr/local/bin/g++ -v
Using built-in specs.
COLLECT_GCC=usr/local/bin/g++
COLLECT_LTO_WRAPPER=/Users/USERNAME/code/usr/local/bin/../libexec/gcc/ x86_64-apple-darwin11.4.0/4.7.1/lto-wrapper
Target: x86_64-apple-darwin11.4.0
Configured with: ../gcc-4.7.1/configure --enable-languages=fortran
Thread model: posix
gcc version 4.7.1 (GCC)
An attempt at compiling a file that "#include"s only iostream:
$ usr/local/bin/g++ c++/source/test.cpp -o ex6
In file included from /Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/bits/postypes.h:42:0,
from /Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/iosfwd:42,
from /Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/ios:39,
from /Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/ostream:40,
from /Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/iostream:40,
from c++/source/ex6.cpp:1:
/Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/cwchar:46:19: fatal error: wchar.h: No such file or directory
compilation terminated.
I tried compiling with some flags recommended in one of the links mentioned, like this: (with all combinations of "usr/" to "usr/local/include/" and "usr/" to "/usr/local/lib" giving the same result (which is also the same as using no flags).
$ /Users/USERNAME/code/usr/local/bin/g++ source/ex6.cpp -I/Users/USERNAME/code/usr/local/include/ -L/Users/USERNAME/code/usr/local/lib/In file included from /Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/bits/postypes.h:42:0,
from /Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/iosfwd:42,
from /Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/ios:39,
from /Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/ostream:40,
from /Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/iostream:40,
from source/ex6.cpp:1:
/Users/USERNAME/code/usr/local/bin/../lib/gcc/x86_64-apple-darwin11.4.0/4.7.1/../../../../include/c++/4.7.1/cwchar:46:19: fatal error: wchar.h: No such file or directory
compilation terminated.
In short, I'm having trouble understanding what the answers in the links provided are saying to do. I saw reference to a specs file, which I could find no specific information for, and "-Wl,-rpath,$(DEFAULT_LIB_INSTALL_PATH)", for which I couldn't figure out what I was supposed to substitute for "DEFAULT_LIB_INSTALL_PATH".
What should I do to point the downloaded g++ compiler to its own files without placing them in their default location, as I do not have administrative capabilities on this account?
I will provide any information as necessary.
It looks like you don't have required header files. You need to install Command Line Tools from Apple Developers site (free registration needed). The problem is that you don't have administrator account. I suggest that you ask the administrator to install the tools for you. If it is not possible you could try to extract the contents of downloaded package (DevSDK.pkg) to your local directory (Pacifist can do that) and pass the path with the missing headers to your compiler. I haven't tried that though.
I'm trying to compile an example program that links to the shared library produced by Sundown. I'm compiling the program like so.
$ gcc -o sd sundown.c -L. -lsundown
Yet, when I run it I get the following error.
./sd: error while loading shared libraries: libsundown.so: cannot open shared object
file: No such file or directory
The output of ls is.
$ ls
libsundown.so libsundown.so.1 sundown.c sd
Why is the shared library not found by ld?
Short solution:
add . (or whatever it is from your -L flag) to your LD_LIBRARY_PATH. When you run sd, it'll look for libraries in the standard places and the LD_LIBRARY_PATH. Note that since you've added ., this will only work if you run sd from the same directory libsundown.so is in.
I plan on distributing the compiled binary. How can I do so that the library can be distributed without forcing people to edit their LD_LIBRARY_PATH?
You should install libsundown.so in one of the standard places, like /usr/lib or /usr/local/lib. You can do that with an installer or a make file, or something as simple as a INSTALL or README that tells the user to stick the libraries there and ensure the permissions are set to something sensible.
On Centos systems with /usr/lib and /usr/lib64, if you install 64-bit libs manually into /usr/lib then at runtime, the library may not be visible even though at build time it is visible (I used autotools and it was able to find my zopfli library from /usr/lib without any problem). When I execute the my_binary that links to /usr/lib/libzopfli.so.1 I got
libzopfli.so.1 => not found
After moving libzopfly.so.1 from /usr/lib to /usr/lib64, then everything works fine.