[cmake-developers] Compile targets affected by changeset

[Ben Boeckel]

On Thu, May 18, 2017 at 17:48:26 -0400, Robert Patterson via cmake-developers wrote:
> 'make' has a limitation where if 'make target1 target2 target3' is
> invoked, target1, target2, and target3 are built serially, not in
> parallel.

Well, this makes sense since there's no `-j` flag given. Are you passing
a `-j` flag to make too?

>           To get around this, we decided that the best option was to
> dynamically create a new [cmake] target which depends on the affected
> targets. This is where we could use some guidance as we have two
> possible approaches: 1. This could either be implemented in cmake
> code; by supplying a command line argument, specifying the "dynamic"
> target which in turn would create a target during the generation
> process. 2. Explicitly specify the "dynamic" target in our project's
> CMakeLists.txt file, and allow cmake to simply add the affected
> targets as a dependency to the dynamic target.

Have you considered using the Ninja generator? It does have dependency
information right from the compiler (via the `-M` flag family).

--Ben