[CMake] How to build a target on install (only)?

[Iosif Neitzke]

For conditional file install, you could try something like "cmake -E
copy_if_different".

On Sun, Feb 15, 2015 at 1:59 PM, Paul Smith <paul at mad-scientist.net> wrote:
> On Sun, 2015-02-15 at 12:16 -0500, David Cole wrote:
>> The easiest thing is probably to use the install(SCRIPT or
>> install(CODE signature of the install command rather than having a
>> "build time" custom command.
>
> Hm.  That has the disadvantage that it runs every time, even if the
> binary hasn't been modified, but it does work:
>
>   install(CODE "message(STATUS \"Creating dSYM for ${target} in ${dir}\")")
>   install(CODE "execute_process(COMMAND dsymutil \"${dir}/${target}\" OUTPUT_QUIET)")
>
> It's too bad that execute_process() doesn't have a COMMENT field, but
> this works OK.  It wasn't clear to me how to pass arguments to a SCRIPT
> so I used CODE instead.
>
> It'd be nice if I could make it a real target that only is invoked on
> install, so that we'd not re-run the command if it wasn't necessary, but
> this gets the work done; thanks for the pointer!
>
> --
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