Can not built MathLink Examples on Raspberry Pi

Questions
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1

Hello Community,

I am using the Raspberry Pi, Modell B with the latest version of Raspbian and the Wolfram Engine. For an project I need to wirte an own MathLink Addon and therefore I started to look at the existing examples in: /opt/Wolfram/WolframEngine/10.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-ARM/MathLinkExamples

I tried to built the simple addtwo Example, but only got this error:

sudo make addtwo
/usr/bin/cc -c  -I/opt/Wolfram/WolframEngine/10.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-ARM/MathLinkExamples/../CompilerAdditions addtwo.c
/usr/bin/c++  -I/opt/Wolfram/WolframEngine/10.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-ARM/MathLinkExamples/../CompilerAdditions addtwotm.o addtwo.o -L/opt/Wolfram/WolframEngine/10.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-ARM/MathLinkExamples/../CompilerAdditions -lML32i4 -lm -lpthread -lrt -lstdc++ -ldl -luuid -o addtwo
/usr/bin/ld: cannot find -luuid
collect2: ld returned 1 exit status
Makefile:29: recipe for target 'addtwo' failed
make: *** [addtwo] Error 1

I could not manage to get it to work, could anyone help me?

Thanks a lot,

Nico

2

Hi, the process is failing because it needs the uuid development libraries. You can install them with the following commands:

sudo apt-get update
sudo apt-get install uuid-dev

We’ll update the installer to require this package.

3

Thank you very much, Alex.
Now I could built the example.
But sadly, on execution of the binary I get now following error:

./addtwo
./addtwo: error while loading shared libraries: libML32i4.so: cannot open shared object file: No such file or directory

Any idea about that?

Thanks a lot for your help,

Nico

4

OK, I came across an idea:
I copied the contant of the /opt/Wolfram/WolframEngine/10.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-ARM/CompilerAdditions Folder:

libML32i3.a  libML32i3.so  libML32i4.a  libML32i4.so  mathlink.h  mcc  mprep

to /usr/lib

and ran sudo /sbin/ldconfig to refresh the cache. Now it works. But that is quite an ugly solution. Which adjustment should I do make it a proper solution?

5

You could add to your LD_LIBRARY_PATH

/opt/Wolfram/WolframEngine/10.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-ARM/CompilerAdditions
6

MathLink binaries are expected to be run from within the Wolfram Language Kernel (e.g. Mathematica), so you’ll see the binaries looking for some of the libraries contained in the $InstallationDirectory. These MathLink examples are providing an interface for the kernel to run the C code. The proper way to use them is to load them within the Kernel with Install.

SetDirectory[$InstallationDirectory <>                                  
           "/SystemFiles/Links/MathLink/DeveloperKit/" <> $SystemID <>          
           "/PrebuiltExamples/"];
link = Install["addtwo"];
AddTwo[1,2]

You can read more about this process in the documentation for Install and our documentation on MathLink/WSTP.

In general, you don’t want to be modifying the system library paths to load non-standard library directories. If you really wanted to run with the Wolfram Language’s libraries, you could just start a binary like this:

LD_LIBARY_PATH=/opt/Wolfram/WolframEngine/10.0/SystemFiles/Libraries/Linux-ARM/:$LD_LIBRARY_PATH ./my_binary
7

Thank you Alex and Illian for your help :)!
It is now working as expected!