Error while building a c++ library interface

I am trying to build an interface to a C++ library I wrote following the procedure described here.

I define the missing constrcut and I receive no error whatsoever. However, when giving the command

build(definemylib)

I receive the following error

Error using clibgen.internal.buildHelper (line 75)
Build failed with error:
'C:/ProgramData/MATLAB/SupportPackages/R2021b/3P.instrset/mingw_w64.instrset/bin/../lib/gcc/x86_64-w64-mingw32/6.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find
-l-LC:\Program Files\MATLAB\R2021b\extern\lib\win64\mingw64
C:/ProgramData/MATLAB/SupportPackages/R2021b/3P.instrset/mingw_w64.instrset/bin/../lib/gcc/x86_64-w64-mingw32/6.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find
-llibMatlabDataArray
collect2.exe: error: ld returned 1 exit status
'.

Error in clibgen.LibraryDefinition/build (line 1406)
            clibgen.internal.buildHelper(obj, obj.LibraryInterface, '', directBuild);      

I actually do not undestand the error, since the files that cannot be found are there in the indicated folders. What am I doing wrong?

Answer 1

[Walter Roberson]

-l-LC:\Program Files\MATLAB\R2021b\extern\lib\win64\mingw64

That is missing a space and also some other information.

There are two different options.

The -l (lower-case L) option needs to be followed by the name of a library to link into the object. An example of that is -llibMatlabDataArray which is saying that the libMatlabDataArray library needs to be located and linked into the object.

The -L (upper-case L) option needs to be followed by a directory name. The option indicates that the linker should add the given directory to the list of directories to search for libraries whose name have been given by -l (lower-case L) options.

Note that it is recommended that directory names with spaces in them be enclosed in double-quotes,

-L"C:\Program Files\MATLAB\R2021b\extern\lib\win64\mingw64"

[CaG]

Thank you for the answer. I know this. However, I did not write this line of code. I do not add that library folder manually. It is something created automatically inside the clibgen.internal.build command on which I have not control. I'm starting to think that maybe I am not giving all the inputs or there is something wrong with mingw64.

[Walter Roberson]

Something is misconfigured in definemylib . The library configuration section has a typing mistake, or something like that.