I want to use cplex (version 12.7.1) in a Netbeans c++ (version 8.2) project, running on a linux system.
I followed the advice given here:
https://www.ibm.com/support/knowledgecenter/SSSA5P_12.7.1/ilog.odms.cplex.help/CPLEX/GettingStarted/topics/set_up/GNU_Linux.html
and configured my project in the following way:
For the c++ compiler:
Include-Directories: /opt/ibm/ILOG/CPLEX_Studio1271/concert/include;/opt/ibm/ILOG/CPLEX_Studio1271/cplex/include
Preprocessor Definitions: IL_STD
For the Linker:
Additional-Library-Directories: /opt/ibm/ILOG/CPLEX_Studio1271/cplex/lib/x86-64_linux/;/opt/ibm/ILOG/CPLEX_Studio1271/concert/lib/x86-64_linux/
Additional Linker Options: -lilocplex -lconcert
However, I am getting the error message:
/usr/bin/ld: cannot find -lilocplex
/usr/bin/ld: cannot find -lconcert
I am unable to see what I'm missing here, how can I get the linker to find the respective libraries?
The options you've listed are partially correct, but there are some important things missing. Below, I'll use <COSDIR> to indicate the directory where CPLEX Optimization Studio is installed (e.g., /opt/ibm/ILOG/CPLEX_Studio1271/ from your example above).
For the C++ compiler:
Include-Directories: <COSDIR>/cplex/include;<COSDIR>/concert/include
Preprocessor Definitions: IL_STD
For the Linker:
Additional-Library-Directories: <COSDIR>/cplex/lib/x86-64_linux/static_pic;<COSDIR>/concert/lib/x86-64_linux/static_pic
Additional Linker Options: -lconcert -lilocplex -lcplex -lm -pthread
This should do the trick (make sure you get those paths exactly right).
Another thing worth trying is the following:
cd <COSDIR>/cplex/examples/x86-64_linux/static_pic
make ilolpex1 2>&1 | tee output.txt
This will compile the ilolpex1 C++ example that is shipped with COS and you'll be able to see all of the options you need to successfully compile on your machine.
Related
I am trying to run a test for my class, but my build.bat did not build correctly.
It says ld.exe is missing in minGW folders.
I already tried to reinstall minGW.
C:\Users\HHT\lab_00\build>g++ -std=gnu++11 -o testB ../_tests/_test_files/testB.cpp ../includes/stub/stub.cpp ../includes/array_functions/array_functions.cpp -Igoogletest/googletest/include
-pthread -Lgoogletest/build/lib -lgtest
c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../../mingw32/bin/ld.exe: cannot find -lpthread
No, it says the library pthread cannot be located.
ld(.exe) is the linker complaining it cannot find it.
Provide proper path to library with -Lmysuper/secret/path/to/location or have the location in PATH in Windows.
I just found out that I missed one of the installations in minGW.
It all good now.
I am trying to run gtest on the codeblocks ide in ubuntu 17.10. It keeps coming back with undefined reference to "x" error.
After some googling it seems that that the ide is missing linker libraries for gtest. Where may I find the linker libraries for gtest?
I have installed gtest using this command:
sudo apt install libgtest-dev
and test built it using this command:
g++ -I /usr/include/gtest -I /usr/src/gtest/ -c /usr/src/gtest/src/gtest-all.cc
The linker to gtest is -lgtest wich you should add in project/build options/Linker settings -> other linker options. Make sure to select the right target (Debug/release) on the left menu.
A good step by step guide has been made here
Based on the answer by Some programmer referencing linking googletestand codeblocks
I found libgtest.a and pthread in the following directories:
/usr/lib/libgtest.a
/usr/lib/x86_64-linux-gnu/libpthread.so
I added the two files through Settings --> Compiler... --> Linker Settings
My test now compiles.
I'm trying to compile a program on Ubuntu 11.10 that uses the Boost libraries. I have the 1.46-dev Boost libraries from the Ubuntu Repository installed, but I get an error when compiling the program.
undefined reference to boost::system::system_category()
What is it that I do wrong?
The boost library you are using depends on the boost_system library. (Not all of them do.)
Assuming you use gcc, try adding -lboost_system to your compiler command line in order to link against that library.
Linking with a library that defines the missing symbol (-lboost_system) is the obvious solution, but in the particular case of Boost.System, a misfeature in the original design makes it use boost::system::generic_category() and boost::system::system_category() needlessly. Compiling with the flag -DBOOST_SYSTEM_NO_DEPRECATED disables that code and lets a number of programs compile without requiring -lboost_system (that link is of course still needed if you explicitly use some of the library's features).
Starting from Boost 1.66 and this commit, this behavior is now the default, so hopefully fewer and fewer users should need this answer.
As noticed by #AndrewMarshall, an alternative is to define BOOST_ERROR_CODE_HEADER_ONLY which enables a header-only version of the code. This was discouraged by Boost as it can break some functionality. However, since 1.69, header-only seems to have become the default, supposedly making this question obsolete.
Another workaround for those who don't need the entire shebang: use the switch
-DBOOST_ERROR_CODE_HEADER_ONLY.
If you use CMake, it's add_definitions(-DBOOST_ERROR_CODE_HEADER_ONLY).
The above error is a linker error... the linker a program that takes one or more objects generated by a compiler and combines them into a single executable program.
You must add -lboost_system to you linker flags which indicates to the linker that it must look for symbols like boost::system::system_category() in the library libboost_system.so.
If you have main.cpp, either:
g++ main.cpp -o main -lboost_system
OR
g++ -c -o main.o main.cpp
g++ main.o -lboost_system
When using CMAKE and find_package, make sure it is :
find_package(Boost COMPONENTS system ...)
and not
find_package(boost COMPONENTS system ...)
Some people may have lost hours for that ...
I got the same Problem:
g++ -mconsole -Wl,--export-all-symbols -LC:/Programme/CPP-Entwicklung/MinGW-4.5.2/lib -LD:/bfs_ENTW_deb/lib -static-libgcc -static-libstdc++ -LC:/Programme/CPP-Entwicklung/boost_1_47_0/stage/lib \
D:/bfs_ENTW_deb/obj/test/main_filesystem.obj \
-o D:/bfs_ENTW_deb/bin/filesystem.exe -lboost_system-mgw45-mt-1_47 -lboost_filesystem-mgw45-mt-1_47
D:/bfs_ENTW_deb/obj/test/main_filesystem.obj:main_filesystem.cpp:(.text+0x54):
undefined reference to `boost::system::generic_category()
Solution was to use the debug-version of the system-lib:
g++ -mconsole -Wl,--export-all-symbols -LC:/Programme/CPP-Entwicklung/MinGW-4.5.2/lib -LD:/bfs_ENTW_deb/lib -static-libgcc -static-libstdc++ -LC:/Programme/CPP-Entwicklung/boost_1_47_0/stage/lib \
D:/bfs_ENTW_deb/obj/test/main_filesystem.obj \
-o D:/bfs_ENTW_deb/bin/filesystem.exe -lboost_system-mgw45-mt-d-1_47 -lboost_filesystem-mgw45-mt-1_47
But why?
When I had this, problem, the cause was the ordering of the libraries. To fix it, I put libboost_system last:
g++ mingw/timer1.o -o mingw/timer1.exe -L/usr/local/boost_1_61_0/stage/lib \
-lboost_timer-mgw53-mt-1_61 \
-lboost_chrono-mgw53-mt-1_61 \
-lboost_system-mgw53-mt-1_61
This was on mingw with gcc 5.3 and boost 1.61.0 with a simple timer example.
in my case, adding -lboost_system was not enough, it still could not find it in my custom build environment. I had to use the advice at Get rid of "gcc - /usr/bin/ld: warning lib not found" and change my ./configure command to:
./configure CXXFLAGS="-I$HOME/include" LDFLAGS="-L$HOME/lib -Wl,-rpath-link,$HOME/lib" --with-boost-libdir=$HOME/lib --prefix=$HOME
for more details see Boost 1.51 : "error: could not link against boost_thread !"
...and in case you wanted to link your main statically, in your Jamfile add the following to requirements:
<link>static
<library>/boost/system//boost_system
and perhaps also:
<linkflags>-static-libgcc
<linkflags>-static-libstdc++
I'm making a code in C++ that shoudl use a library that is called Concorde to solve a well known problem called Traveling Salesman Problem. This library is available here
I've compiled by first running ./configure --with-cplex=<CPLEX_DIR> and then make resulting in two main files concorde.a and concorde.h. In this way concorde is configure to run and use IBM Cplex as the exact solver.
I'm using Code::Blocks as IDE and in the build options I've added the library (concorde.a) under Link libraries and included the header in my code.
However when I try to compile my code, it gives me and error indicating that it can't find the implementation of the concorde functions that I call and that are defined in the concorde.h file. In this case the error is "undefined reference to <function>".
Can anyone help me with that?
The last part of the build log of codeblocks is the following:
g++ -L/opt/ibm/ILOG/CPLEX_Studio1251/cplex/lib/x86-64_sles10_4.1/static_pic
-L/opt/ibm/ILOG/CPLEX_Studio1251/concert/lib/x86-64_sles10_4.1/static_pic
-L/opt/concorde -o bin/Debug/SVRPDSP obj/Debug/instance.o obj/Debug/lib/combo.o
obj/Debug/lib/IncumbentCallback2C.o obj/Debug/lib/lazyCallback2C.o
obj/Debug/lib/lazyCallbackGLS.o obj/Debug/lib/lib_algorithms.o
obj/Debug/lib/lib_general.o obj/Debug/solution.o -lrt -lilocplex -lcplex
-lconcert -lm -lpthread /opt/concorde/concorde.a
ps: I'm compiling on Ubuntu 13.10
Thanks.
First of all: Concorde does not support CPLEX 12.5.
I have downloaded QSopt and launched ./configure --with-qsopt=QSOPT_DIR.
Finally, the order of the libs is the following:
-lilocplex -lconcert -lcplex /opt/concorde/concorde.a /opt/QS/qsopt.a -lm -lpthread
I am have been attempting to get a C++ project setup using boost file system library using eclipse. I followed these directions to install boost on my system. The directions where pretty much
download
extract
run bootstrap.sh
run ./bjam architecture=combined
That seemed to go fine, no errors. I then fired up eclipse and created a new test project called test with a single file called test.cpp. The code in it is:
#include <stdio.h>
#include <boost/filesystem.hpp>
int main() {
boost::filesystem::path path("/Users/schoen"); // random pathname
bool result = boost::filesystem::is_directory(path);
printf("Path is a directory : %d\n", result);
return 0;
}
This is just something simple to make sure it is all set up correctly. Of course I tried to compile at this point and it failed. Did some googling and found this site. It said to add the boost library to the linker by going to project properties and adding "boost_filesystem". I tried this, and well it didn't work.
Can someone point me in the right direction or give me a hint to how to set up Boost in an Eclipse project?
I am new to C++ and Eclipse, and most my experience is in Java with Netbeans. So I am pretty lost at the moment.
UPDATE
I just wanted to update on what I have tried based on the answers given.
Based on Alex's suggestion I added boost_system and boost_filesystem to the linker list. I was still getting the same compiler errors.
Following the suggestion from rve I added the path to the boost libraries to the Library search path. When this did not work. I cleared out the linker list and tried it with just the library search path. This also did not work.
I then cleared the Library search path. I then manually edited the command on the linker window to be 'g++ -L/Users/jacobschoen/Library/boost_1_45_0/stage/lib -lboost -lboost_filesystem'. This also did not work.
In all of these I tried setting the path to boost to be '/Users/jacobschoen/Library/boost_1_45_0' and '/Users/jacobschoen/Library/boost_1_45_0/stage/lib'. Neither worked.
As requested the comiler error for the above code is:
**** Build of configuration Debug for project test ****
make all
Building file: ../src/test.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/test.d" -MT"src/test.d" -o"src/test.o" "../src/test.cpp"
../src/test.cpp:10:32: warning: boost/filesystem.hpp: No such file or directory
../src/test.cpp: In function 'int main()':
../src/test.cpp:13: error: 'boost' has not been declared
../src/test.cpp:13: error: expected `;' before 'path'
../src/test.cpp:14: error: 'boost' has not been declared
../src/test.cpp:14: error: 'path' was not declared in this scope
make: *** [src/test.o] Error 1
If any one has any further suggestions I am still trying.
Second Update
On a suggestion by rholmes I added an include library along with the linker list and library search path. So now the compile error is:
**** Build of configuration Debug for project test ****
make all
Building target: test
Invoking: MacOS X C++ Linker
g++ -L/Users/jacobschoen/Library/boost_1_45_0 -o "test" ./src/test.o -lboost_system -lboost_filesystem
ld: library not found for -lboost_system
collect2: ld returned 1 exit status
make: *** [test] Error 1
Any ideas?
Just wanted to be clear on what actually worked, since it was kinda pieced together from a few answers.
Download the boost files and extract them to where you want to put them.
In your terminal navigate to the directory and run ./bootstrap.sh
When that is done run ./bjam (this takes a while so go smoke and get a cup of coffee)
Open up your eclipse Project and go to Project > Properties > C/C++ Build > Settings
Click on MacOS X C++ Linker > Libraries.
You should see a split window with the top being for 'Libraries (-l)'. In this section add both boost_system and boost_filesystem. In the bottom section it should be for 'Library Search Path (-L)'. Here you want to put the path to the stage/lib directory inside where you extracted the boost download. It should look similar to below:
Click GCC C++ Compiler > Includes. This will be a single pane where it says 'Include Paths (-I)', well I think it is an I as he font is weird and could be a lower case l also. Anyway in that section add the path to where you put boost without the stage/lib part. It should look like below:
Everything should compile now with out a problem, and if you need to use any other boost libraries it should be just a matter of adding it to the linker section where boost_filesystem and boost_system are. Enjoy.
Not sure where you do this in Eclipse these days, but under the include paths for Eclipse should be the path to the main boost directory (/Users/jacobschoen/Library/boost_1_45_0?). The compiler line should have something like the following in it, I would think:
Invoking: GCC C++ Compiler
g++ -I/Users/jacobschoen/Library/boost_1_45_0 -O0 -g3 -Wall -c -fmessage-length=0 -MMD (etc..)
Update: Looking at my system, the linker path on yours might be more appropriately:
-I/Users/jacobschoen/Library/boost_1_45_0/stage/lib
Depending, of course, upon how you've installed and built boost -- this is with my most recent attempt with a full source build. Depending upon how you obtained boost, this may or may not be different. I recently redid the boost on my Mac for 64 bit and haven't had much time to try it yet....
Add boost_system to the linker list, together with boost_filesystem.
I had recently uninstalled the boost rpm and installed Boost like how you did. I had no problems running Boost programs in Eclipse. I didn't add any extra parameters. Just installed boost and ran Boost programs. It works fine.
Tried your program in the vi editor. Commented out everything in main
#include <cstdio>
#include <boost/filesystem.hpp>
int main() {
/*boost::filesystem::path path("/Users/schoen"); // random pathname
bool result = boost::filesystem::is_directory(path);
printf("Path is a directory : %d\n", result);*/
return 0;
}
and it still gave this error:
/tmp/cc7TAIYS.o: In function `__static_initialization_and_destruction_0(int, int)':
test.cpp:(.text+0x29): undefined reference to `boost::system::get_system_category()'
test.cpp:(.text+0x35): undefined reference to `boost::system::get_generic_category()'
test.cpp:(.text+0x41): undefined reference to `boost::system::get_generic_category()'
test.cpp:(.text+0x4d): undefined reference to `boost::system::get_generic_category()'
test.cpp:(.text+0x59): undefined reference to `boost::system::get_system_category()'
collect2: ld returned 1 exit status
I'm puzzled. Boost programs work on my system, but your program's header files itself are giving a problem. I doubt it's a problem with Eclipse. It has to be something else.
I just ran into something very similar to this using eclipse and CDT... It turns out, using ubuntu and apt-get, libboost_system installs as libboost_system.1.40.0 in /usr/lib
If you try to add it via the library tab in Helios it will complain because it is looking for *.so and *.s0.1.40.0 clearly doesn't match that. However after looking closely at what the linker was trying to doo, I just typed the raw string "boost_system" into the include path adder. This resulted in the linker doing a " -lboost_system" which is a format the linker knows how to deal with in resolving version dependency... If you instead put in the full path to the .so file, the linker will just complain because it tries to do a " -l/usr/lib/libboost_system.so.1.40.0" .
So take my advice and just type in the simple " boost_system" after doing an apt-get install.. It will make it all very easy.