[CMake] making files appear in MSVS "solution explorer"

[Abe Stephens]

How can I add any old file to the solution explorer panel in visual 
studio? The .i files used by the swig module show up quite nicely but I 
can't follow what's going on in that script closely enough to figure it out.

In the example below, is it possible to have ${source_file} show up in 
the side bar under the ${target}?  I've tried using: 
SOURCE_GROUP(${target} FILES ${source_file}) but the file doesn't show 
up. I am assuming that ${source_file} will have a non-standard file 
extension.

Thanks-
Abe



>     SET_SOURCE_FILES_PROPERTIES(${source_file} PROPERTIES CPLUSPLUS ON)
>   
>     ADD_CUSTOM_COMMAND(
>       OUTPUT ${generated_file}
>       DEPENDS ${source_file}
>       COMMAND ${cmd}
>       ARGS ${source_file}
>            -o ${generated_file}
>            )
>    
>     ADD_CUSTOM_TARGET(
>       ${generated_target}
>       ALL
>       DEPENDS ${generated_file}
>       )
>   # Add the library.
>   ADD_LIBRARY(${target}
>     ${generated_file}
>     )