Merge topic 'FindMatlab-unknown-version'

a3c389cb17 FindMatlab: set MATLAB_DEFAULT_RELEASE for unknown version

Acked-by: Kitware Robot <[email protected]>
Merge-request: !4986

Modules/FindMatlab.cmake

@@ -992,7 +992,10 @@ function(matlab_add_mex)
     endif()
   endif()
 
-  if(NOT Matlab_VERSION_STRING VERSION_LESS "9.4") # For 9.4 (R2018a) and newer, add API macro
+  # For 9.4 (R2018a) and newer, add API macro.
+  # Add it for unknown versions too, just in case.
+  if(NOT Matlab_VERSION_STRING VERSION_LESS "9.4"
+      OR Matlab_VERSION_STRING STREQUAL "unknown")
     if(${${prefix}_R2018a})
       set(MEX_API_MACRO "MATLAB_DEFAULT_RELEASE=R2018a")
     else()