Supress MEX warning: f951: Warning: Nonexistent include directory ‘MATLABROO​T/simulink​/include’ [-Wmissing-include-dirs]

I have MATLAB 2019b but not simulink installed on my computer (ubuntu 16.04). When trying

mex(fullfile(matlabroot, 'extern', 'examples', 'refbook', 'timestwo.F'));

I got the following

warning: f951: Warning: Nonexistent include directory 'MATLABROOT/simulink/include' [-Wmissing-include-dirs]

where MATLABROOT represents the root path of matlab on my computer. Nevertheless, the resultant timestwo.mexa64 works without any problem. I suppose simulink is not needed at all for timestwo.

I am writing a script for mexifying a few Fortran functions of my own, and the same warning pops up inevitably. However, my functions do not rely on simulink in any way. How could I suppress this warning?

Thank you very much!

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In case needed (even though not likely), here is the output of mex -v -setup FORTRAN. It containts nothing strange and nothing related to simulink.

Verbose mode is on.
... Looking for compiler 'gfortran6-' ...
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Looking for folder '/usr/bin' ...Yes.
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Executing command 'gfortran -print-file-name=libgfortran.so' ...Yes ('/usr/lib/gcc/x86_64-linux-gnu/5/libgfortran.so').
... Looking for folder '/usr/lib/x86_64-linux-gnu' ...Yes.
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Executing command 'gfortran -print-file-name=libgfortranbegin.a' ...Yes ('/usr/lib/gcc/x86_64-linux-gnu/5/libgfortranbegin.a').
... Looking for folder '/usr/lib/gcc/x86_64-linux-gnu/5' ...Yes.
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Executing command 'gfortran -dumpversion' ...Yes ('5.5.0').
Found installed compiler 'gfortran6-'.
... Looking for compiler 'gfortran' ...
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Looking for folder '/usr/bin' ...Yes.
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Executing command 'gfortran -print-file-name=libgfortran.so' ...Yes ('/usr/lib/gcc/x86_64-linux-gnu/5/libgfortran.so').
... Looking for folder '/usr/lib/x86_64-linux-gnu' ...Yes.
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Executing command 'gfortran -dumpversion | awk -F '.' '$1>=6' ' ...No.
Did not find installed compiler 'gfortran'.
... Looking for compiler 'gfortran6-' ...
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Looking for folder '/usr/bin' ...Yes.
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Executing command 'gfortran -print-file-name=libgfortran.so' ...Yes ('/usr/lib/gcc/x86_64-linux-gnu/5/libgfortran.so').
... Looking for folder '/usr/lib/x86_64-linux-gnu' ...Yes.
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Executing command 'gfortran -print-file-name=libgfortranbegin.a' ...Yes ('/usr/lib/gcc/x86_64-linux-gnu/5/libgfortranbegin.a').
... Looking for folder '/usr/lib/gcc/x86_64-linux-gnu/5' ...Yes.
... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').
... Executing command 'gfortran -dumpversion' ...Yes ('5.5.0').
Found installed compiler 'gfortran6-'.
MEX configured to use 'gfortran6-' for FORTRAN language compilation.

Answer 1

[Josh G.]

Usually you could just pass a compiler option that would disable this warning, but a bug in gfortran causes the -Wno-missing-include-dirs option not to work.

The only other way to remove this warning is to stop mex from trying to include that directory. Open your mex_FORTRAN_glnxa64.xml file, find the part starting with "INCLUDE=" and remove the following:

-I"$MATLABROOT/simulink/include"