From b704d58f41def99de41485af364d9c7ea46ed475 Mon Sep 17 00:00:00 2001 From: Silvio Traversaro Date: Sat, 11 Jan 2020 10:35:46 -0500 Subject: FindMatlab: in matlab_add_mex use the correct version file Before this modification, the c_mexapi_version.c file was added to all mex libraries. However, if the C language was not enabled in the CMake project configuration, the c_mexapi_version.c file was ignored, creating linking errors in Windows and macOS. This commit ensures that in the case only the CXX languages is enabled, the correct version is passed. Fixes: #19382 --- Modules/FindMatlab.cmake | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/Modules/FindMatlab.cmake b/Modules/FindMatlab.cmake index c8cae2e..ca56dd5 100644 --- a/Modules/FindMatlab.cmake +++ b/Modules/FindMatlab.cmake @@ -974,10 +974,19 @@ function(matlab_add_mex) endif() if(NOT Matlab_VERSION_STRING VERSION_LESS "9.1") # For 9.1 (R2016b) and newer, add version source file - # TODO: check the file extensions in ${${prefix}_SRC} to see if they're C or C++ files - # Currently, the C and C++ versions of the version files are identical, so this doesn't matter. - set(MEX_VERSION_FILE "${Matlab_ROOT_DIR}/extern/version/c_mexapi_version.c") - #set(MEX_VERSION_FILE "${Matlab_ROOT_DIR}/extern/version/cpp_mexapi_version.cpp") + # Add the correct version file depending on which languages are enabled in the project + if(CMAKE_C_COMPILER_LOADED) + # If C is enabled, use the .c file as it will work fine also with C++ + set(MEX_VERSION_FILE "${Matlab_ROOT_DIR}/extern/version/c_mexapi_version.c") + elseif(CMAKE_CXX_COMPILER_LOADED) + # If C is not enabled, check if CXX is enabled and use the .cpp file + # to avoid that the .c file is silently ignored + set(MEX_VERSION_FILE "${Matlab_ROOT_DIR}/extern/version/cpp_mexapi_version.cpp") + else() + # If neither C or CXX is enabled, warn because we cannot add the source. + # TODO: add support for fortran mex files + message(WARNING "[MATLAB] matlab_add_mex requires that at least C or CXX are enabled languages") + endif() endif() if(NOT Matlab_VERSION_STRING VERSION_LESS "9.4") # For 9.4 (R2018a) and newer, add API macro -- cgit v0.12