How to link Armadillo with Eclipse - eclipse

Question

I want to use Armadillo with Eclipse. However all the instructions to link Armadillo is given for Visual Studio. Now I followed the instructions outlined in the ReadMe file of the Armadillo library. I added the Armadillo include folder in project(right click)->properties->C/C++ Build->Settings->Cross G++ Compiler->Includes->Inlcude paths(-I) and then I added the libraries folder (The library folder contain lapack and blas .lib and .dll files) in project(right click)->properties->C/C++ Build->Settings->Cross G++ Linker->Libraries->Library search path (-L).
However when I compile the code in the Eclipse I get the error
.....armadillo_bits/lapack_wrapper.hpp:37: undefined reference to `dgetrf_'.
Shouldn't it simply search for .lib files in the library folder and include them during compiling? I would appreciate any help regarding this matter.
Regards,
TM

Answer 1

Linking the Armadillo library to an Eclipse project can be done and you were about to do it ! It's pretty much the same as for any other library.
In the properties of the project :
GCC C++ Compiler -> Includes : add the path to the file armadillo (where namespace arma is declared) to the include search path (option -I). Example : /home/alpha/soft/armadillo-4.400.1/include
GCC C++ Linker -> Libraries : add the path to the file libarmadillo.so... in the library search path (option -L) Example : /home/alpha/soft/armadillo-4.400.1 . Add armadillo, lapack, blas and m as libraries (option -l). m is for math.
Here are the calls to the compiler and the linker as produced by eclipse :
make all
Building file: ../src/armaeclip.cpp
Invoking: GCC C++ Compiler
g++ -I/home/alpha/soft/armadillo-4.100.1/include -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/armaeclip.d" -MT"src/armaeclip.d" -o "src/armaeclip.o" "../src/armaeclip.cpp"
Finished building: ../src/armaeclip.cpp
Building target: armaeclip
Invoking: GCC C++ Linker
g++ -L/home/alpha/soft/armadillo-4.100.1 -o "armaeclip" ./src/armaeclip.o -larmadillo -lblas -lm -llapack
Finished building target: armaeclip
**** Build Finished ****
As you run the code, you might get something like :
error: det(): use of ATLAS or LAPACK needs to be enabled
terminate called after throwing an instance of 'std::logic_error'
what(): det(): use of ATLAS or LAPACK needs to be enabled
Abandon (core dumped)
To avoid this problem, follow the advise of the faq of Armadillo : uncomment #define ARMA_USE_LAPACK in file /home/alpha/soft/armadillo-4.100.1/include/config.hpp and rebuild your project.

Answer 2

You can also create GNU Autotools projects and add following line:
bin_PROGRAMS=armadillo_example
armadillo_example_SOURCES=armadillo_example.cpp
armadillo_example_LDADD=-larmadillo
To Makefile.am file where your source code exist.

Answer 3

If you don't require optimized BLAS libraries, you can use the BLAS and LAPACK libraries that come with Armadillo.
Project properties > C/C++ Build > Settings > GCC C++ Compiler >
Includes > Include paths (-l): C:\armadillo-x.xxx.x\include
Then in Environment Variables > System variables, modify the Path
variable and add: C:\armadillo-x.xxx.x\examples\lib_win64\
Project properties > C/C++ General > Paths and Symbols > Libraries:
blas_win64_MT and lapack_win64_MT (it is important to add them
this way, with no path or .lib/.dll)
Then in Environment Variables > System variables, modify the Path
variable and add: C:\armadillo-x.xxx.x\examples\lib_win64\
And your Armadillo library in Eclipse is good to go.
I've used Eclipse 4.14.0 and Armadillo 9.850.1.