Error using codegen - R2016b on Ubuntu14.04 - MATLAB Answers

Error using codegen - R2016b on Ubuntu14.04

Asked by Seong Hun Lee on 1 Oct 2016

Latest activity Edited by Seong Hun Lee on 2 Oct 2016

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When I run "FaceTrackingKLTpackNGoExample.m", I get the following error

>> FaceTrackingKLTpackNGoExample
-> Generating Code (it may take a few minutes) ....
??? Build error: Build failed for project 'FaceTrackingKLTpackNGo_kernel'. See the Target Build Log in
the report for further details.
Error in ==> FaceTrackingKLTpackNGo_kernel Line: 1 Column: 1
Code generation failed: View Error Report
Error using codegen
Error in FaceTrackingKLTpackNGoExample (line 70)
codegen(codegenArgs{:}, fileName);

When I click "View Error Report", I see the following

/usr/bin/ld: HostLib_rtw.o: undefined reference to symbol 'dlclose@@GLIBC_2.2.5'
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libdl.so: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
gmake: *** [/tmp/tp44a3c425_46b9_48ab_b357_fe1e097b3d62/codegen/FaceTrackingKLTpackNGo_kernel] Error 1

Has anyone ever experienced the same problem? Any solution please?

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Answer by Walter Roberson on 1 Oct 2016

You may need to add the "dl" library to be linked. If you are working from the command line that would be by adding -ldl

I see in the error message a reference to /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libdl.so . The first .. would take you up to where 4.8 was a child; the second .. would take you up to where x86_64-linux-gnu was a child; the third .. would take you up to where gcc was a child, so that would seem to resolve to /usr/lib/x86_64-linux-gnu/libdl.so . I wonder if that actually exists or if the file is really in /usr/lib/gcc/x86_64-linux-gnu/libdl.so ? Is /usr/lib/gcc/x86_64-linux-gnu/libdl.so perhaps a symlink that resolves to /usr/lib/x86_64-linux-gnu/libdl.so ?

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Seong Hun Lee on 2 Oct 2016

The problem is that running the script gives me an error in line 70 when the "codegen" function is first used:

%%Create the Packaged Zip-file
% Invoke codegen command with packNGo function call.
fprintf('-> Generating Code (it may take a few 70: minutes) ....\n');
codegen(codegenArgs{:}, fileName);

So the line 83 is never reached in the first place...

These are the other directory addresses which I can print:

visiondemo_dir: "/usr/local/MATLAB/R2016b/toolbox/vision/visiondemos"
currentDir: "/home/seonghunlee/OpenSourceCode/MATLAB_code/MATLAB_CV_DEMO"
codegenOutDir: "/tmp/tpe5458449_5603_4a0d_b59a_e86c0f8e0489/codegen"

Walter Roberson on 2 Oct 2016

Look in the directory codegenOutDir -- you might have to look a directory down from there to find the Makefile

Seong Hun Lee on 2 Oct 2016

Unfortunately, there is no Makefile in codegenOutDir.... :(

This it the directory structure:

|-- codegenOutDir
    |-- buildinfo.mat
    |-- FaceTrackingKLTpackNGo_kernel.zip
    |-- codegen
        |--exe
           |--FaceTrackingKLTpackNGo_kernel
              |--examples
              |--html
              |--interface
              |--Other bunch of generated .c, .h, .o files

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