[CMake] EXCLUDE_IF_UNUSED was : "Needs Utility" macro

[William A. Hoffman]

At 03:20 AM 5/12/2006, John Biddiscombe wrote:
>>PROJECT(SUBDIR)
>>SUBDIRS(Executable EXCLUDE_FROM_ALL Examples)
>
>OK. The EXCLUDE_FROM_ALL flag is doing what it is supposed to do. The (in this case) Examples projects are not built by default. However, they do still appear in the IDE (Vis Stud).

There is a test in CMake/Tests/SubDir.  If I load the solution for that test,
SUBDIR.sln it does not have example1 or example2 in it.   

It does this:
SUBDIRS(Executable EXCLUDE_FROM_ALL Examples)

Examples has example1 and example2.   So, exclude from all is supposed to
keep the projects out of the top level sln file.


>I'd like to do this
>ADD_SUBDIRECTORY(UtilityLib1 EXCLUDE_IF_UNUSED)
>ADD_SUBDIRECTORY(UtilityLib2 EXCLUDE_IF_UNUSED)
>ADD_SUBDIRECTORY(UtilityLib3 EXCLUDE_IF_UNUSED)
>...
>
>so that if we have
>IF(USER_WANTS_PROJECTX)
>  ADD_SUBDIRECTORY(ProjectX)
>  # imagine that project X uses Utilility lib 1,3
>ENDIF(USER_WANTS_PROJECTX)
>
>IF(USER_WANTS_PROJECTY)
>  ADD_SUBDIRECTORY(ProjectY)
>  # imagine that project Y uses Utilility lib 2
>ENDIF(USER_WANTS_PROJECTY)
>
>etc etc
>
>If (from the GUI) we enable projectX, then 1,3 are built and are seen in the IDE, if we enable Y, then 2 is seen, and so on, but when unused, they just disappear completely from the build and IDE. I have about 10 projects and about 5 utilites that are used in various combinations. I started writing macros to hide the ones that are not used, but due to complex subdirectory heirarchies it is painfull.
>
>Is there an easy way to do this, and if not, is it a good suggestion for an addition?


It might be easier to do this on a target level rather than a directory level.
Something like this:
set_target_properties(foo PROPERTIES SKIP_IF_NOT_USED TRUE)

I think that would be possible, and maybe not too hard.


-Bill



>JB
>
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