[cmake-developers] RFC: CMake precompiled header support and custom compiler based implementation

[Matt McCormick]

Hi Adam,

Thank you for working on this!  This would be a killer feature.


> I also want to suggest to put native precompiled header support somewhere high on the TODO list and I propose this simple API for specifying precompiled header for given target:
>
>         target_precompiled_header(<target> <path/to/precompiled_header.h>)
>
>         target_precompiled_header(<target> <path/to/precompiled_header.h> SHARED
>                                   <other_target_to_share_precompiled_header_with>)
>

I think the use of the "SHARED" specifier here should be avoided since
SHARED is used in add_library, and it has a completely different
meaning there.

An improvement in the API (although maybe not perfect):

  target_precomplied_header(<target>
                                          [PREFIX <path/to/prefix_header.h>]
                                          [FROM
<other_target_to_share_precomplied_header_with>])

 This way we do not need to specify all the targets to shared the
precompiled header with at one time and in one call.

Thanks,
Matt