Fix nmake install

Author: isuruf

CMakeLists.txt

@@ -362,13 +362,25 @@ include_directories(BEFORE
   ${CMAKE_CURRENT_SOURCE_DIR}/include
   )
 
+if (MSVC)
+# Direct module files to build include directory
+set(CMAKE_Fortran_MODULE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/runtime/flang)
+
+# Install Fortran module files
+# TODO: this creates empty directories. Figure out a workaround or
+# better would be to figure out why CMAKE_Fortran_MODULE_DIRECTORY is different
+install(DIRECTORY ${CMAKE_Fortran_MODULE_DIRECTORY}/
+  DESTINATION include FILES_MATCHING PATTERN *.mod
+  )
+else()
 # Direct module files to build include directory
 set(CMAKE_Fortran_MODULE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include)
 
 # Install Fortran module files
 install(DIRECTORY ${CMAKE_Fortran_MODULE_DIRECTORY}/
   DESTINATION include
   )
+endif()
 
 # Install Fortran OpenMP include file
 # Copy omp_lib.h file, not the symlink