[CMake] Custom Command OUTPUTs to understand geenrator expressions?

[Petr Kmoch]

Hi Chris,

you're definitely not the first to want this (see
https://gitlab.kitware.com/cmake/cmake/issues/12877). However, as per the
comment in that issue, it's not something we can expect in any foreseeable
future.

Petr

On 1 November 2017 at 17:35, Chris Green <greenc at fnal.gov> wrote:

> Hi,
>
> I have a case where a custom command produces multiple outputs, at least
> some of which depend on a property of a library target, viz:
>
>   if (BD_WANT_PCM)
>     set(PCM_OUTPUT
>       $<TARGET_PROPERTY:${dictname}_dict,LIBRARY_OUTPUT_DIRECTORY>
> /${CMAKE_SHARED_LIBRARY_PREFIX}${dictname}_dict_rdict.pcm)
>     if (GD_PCM_OUTPUT_VAR)
>       set(${GD_PCM_OUTPUT_VAR} ${PCM_OUTPUT} PARENT_SCOPE)
>     endif()
>   endif()
>   add_custom_command(
>     OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${dictname}_dict.cpp
>     # Extra outputs commented out until custom_command OUTPUT supports
>     # generator flags.
>     ${SOURCE_OUTPUT} # ${GD_ROOTMAP_OUTPUT} ${PCM_OUTPUT}
>   ...
>
> Here, ${PCM_OUTPUT} needs to be specified to be put in the same directory
> as the library produced for the target ${dictname}_dict, which may be
> something particular to that target rather than its defaulted value of
> ${CMAKE_LIBRARY_OUTPUT_DIRECTORY} or ${LIBRARY_OUTPUT_PATH}.
> Unfortunately, this fails to work as of CMake 3.9.2. Is this something
> which is reasonable to want and/or easy to do. Is there some other way to
> have the desired flexibility?
>
> Thanks for any help,
>
> Chris.
>
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