mex command with -largeArrayDims and/or -R2017b?

[New Formulation after only 5 views and no answer after 3 days]

I want to compile a C file under different Matlab versions preferrably with the same command. I know these directives for the mex command:

• -compatibleArrayDims (32-bit C-Matrix-API)
• -DMX_COMPAT_32 (32-bit C-Matrix-API)
• -largeArrayDims (64-bit C-Matrix-API)
• -2017b (separate complex data, C-Matrix-API: mxGetPr)
• -2018a (interleaved complex numbers, C-Data-API: mxGetData)

The first 2 are equivalent and the default under <= R2015b/32, as far as I know. My codes are 64 bit clean and use the C-Matrix-API e.g. the mxGetPr() command, so the 32 bit flags are needed only to support olöd 32 bit systems.

I want to compile with largeArrayDims (64 bit arrays) and the C-Matrix-API:

mex -O -largeArrayDims -R2017b test.c

But under R2018b this fails with the message:

*** Compilation failed:
Calling MEX with both 'R2017b' and 'largeArrayDims' not supported.

Why? I thought, that these directives are not mutually exclusive, but equivalent.

Do I need different flags for calling mex under R2016b and R2018b?

Some corresponding pages, which does not clarify the question:

• https://www.mathworks.com/matlabcentral/answers/377799-compiling-mex-files-without-the-mex-command
• https://www.mathworks.com/help/matlab/matlab_external/troubleshooting-mex-api-incompatibilities.html

Answer 1

[Jan]

According to the answer of the technical support:

The 64 bit addressing triggered by the -largeArrayDims flag is implicitly enabled by -R2017b already. Although there is no conflict for the actual compilation, the flags are treated as incompatible.

Solution: Use -largeArrayDims for compiling under older Matlab versions, and -R2017b for newer ones:

if verLessThan('matlab', '9.4')  % < R2018a
  mex -largeArrayDims test.c
else                             % >= 2018a
  mex -R2017b test.c
end

Not handy, but working.