[CMake] Force target to always run last?

[David Cole]

I'm sorry, I misunderstood that you wanted it to run last regardless
of what target you are building. I was assuming you wanted it to
happen when you build the "all" target. I didn't think you wanted to
run it after any other *individual* target which you might specify.

I don't know of an easy way to do that. You could add a custom command
as a post-build command on every single target, but that seems like it
wouldn't work for you either, as it would run the command potentially
multiple times, with no way to tell whether you're being called last
or not.

Sorry.

Why does this need to run after the build of any individual target?
Why not just say there are two ways to get it to run: build "all" or
explicitly build it after you build the other individual thing you
want?




On Thu, May 18, 2017 at 10:24 AM, Robert Dailey
<rcdailey.lists at gmail.com> wrote:
> David,
>
> Thanks for your help. So if I do it as you suggest, this will also
> require I specify `ALL` to add_custom_target(), correct? If I do it
> this way, will it still run even if it isn't a dependency of the
> target I'm building?
>
> Let me set up a simple scenario for my own understanding. Suppose I
> have the following targets:
>
> * A (add_library target)
> * B (add_library target)
> * C (add_custom_target target)
>
> Dependencies:
>
> B depends on A
> C depends on B and A
>
> Normally if I build B, only A and B will build. However, if C was set
> up using `ALL`, will it build C when I build B? So the expected build
> order in this case would be:
>
> 1. A
> 2. B
> 3. C
>
> Thanks in advance.
>
> On Wed, May 17, 2017 at 4:26 PM, David Cole <DLRdave at aol.com> wrote:
>> The way I know how to do this is to add it last at the bottom of the
>> top-level CMakeLists.txt file, and then use add_dependencies to make
>> it depend on all other targets. (Or at least all other "leaf" targets,
>> which further depend on others, ... the sum of which is "all other
>> targets" besides the new "last" target.)
>>
>> So it's not pretty, but it's possible.
>>
>>
>> HTH,
>> David C.
>>
>>
>>
>> On Wed, May 17, 2017 at 11:36 AM, Robert Dailey
>> <rcdailey.lists at gmail.com> wrote:
>>> I have a custom target that must meet the following requirements:
>>>
>>> * It must always run, regardless of what subset of other targets are being built
>>> * It must always be the very last thing run. In parallelized builds,
>>> it must wait until all other targets are done building before
>>> starting, so that it is the very last target run, and should not run
>>> in parallel  with others.
>>>
>>> Is this possible? I'm willing to use hackery if needed...
>>>
>>> Running CMake 3.8.0. Thanks!
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