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I have installed intel mkl library. contents have path /home/user/intel/..... . I have to run a C++ code using make file on which it is mentioned.

CC = /home/user/intel/bin/icpc -g
INCLUDE = -I/home/user/intel/mkl/include 
LIB = -L/home/user/intel/mkl/lib/intel64 -lmkl_core -lmkl_intel_lp64 -lmkl_intel_thread -liomp5 -lpthread -std=c++11

I have successfully installed parallel_studio_xe_2019_update5_cluster_edition . but still I'm getting an error message that ./main :error while loading shared libraries. How can I fix this error. What changes I need to do?

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  • Did you follow the MKL documentation, namely that part for setting environment variables by including a given script (such as mklvars.sh) in your environment? Commented Sep 20, 2019 at 13:55
  • I only run install_GUI.sh in the terminal. But where can I find mklvars.sh intel64 Commented Sep 20, 2019 at 14:09
  • Yes, you should include that script in your Bash session, see here how: How to include file in a bash shell script. A common way is to put this inclusion into a Bash startup script (sucha a ~/.bashrc) to apply it automatically to all Bash sessions. Commented Sep 20, 2019 at 14:11
  • Before running your application, at the shell, try this: export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/path/to/your/library Commented Sep 20, 2019 at 14:14
  • For me its hard to grasp this explanation. Can you please explain it with some easy language.I compile my code simply by writing make, what will be /path/to/your/library in my case ? Commented Sep 20, 2019 at 14:20

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Linking with shared libraries is actually done in two steps: When building (where the linker needs to find the library); And when running (when the operating system dynamic loaded needs to find the library).

When building with libraries installed in non-standard locations, you tell the linker where to find the library using the -L option. Unfortunately it doesn't tell the dynamic loader where the library is located.

To tell the dynamic loader the location of a dynamic library there are a couple of way, the one I recommend is to add a flag when building so the linker will embed the location inside the executable program file for the dynamic loader to see. This is done with the option -Wl,-rpath,/path/to/lib/directory.

In your case you need to add the option -Wl,-rpath,/home/user/intel/mkl/lib/intel64 to the LIB makefile variable.

To clarify, the full line should be

LIB = -L/home/user/intel/mkl/lib/intel64 -Wl,-rpath,/home/user/intel/mkl/lib/intel64 -lmkl_core -lmkl_intel_lp64 -lmkl_intel_thread -liomp5 -lpthread -std=c++11

That is, you need both the old -L option (as you current have it in the code you show) and add the new option.

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7 Comments

But then how and where should I need to define rpath?
@huda_ Almost, -Wl with l as in lower-case L. And you still need the -L option for the linker to find the libraries.
I edited like this: LIB = -L//-Wl,rpath//home/tqc04/intel/mkl/lib/intel64 -lmkl_core -lmkl_intel_lp64 -lmkl_intel_thread -liomp5 -lpthread -std=c++11 . But still can't fix this error.I never met with such type of problem. I mistakenly deleted some files in home directory after which i'm facing this problem
@huda_ You're misunderstanding what I mean. See my updated answer
I mentioned that line but still getting same error.
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