[CMake] CCACHE_DIR Environment Variable

[Craig Scott]

Rather than relying on environment variables, you can use CMake's
find_program() command to find ccache on your path and then tell CMake to
use that as a launcher. You can find an article with a detailed explanation
of how to set this up here:

https://crascit.com/2016/04/09/using-ccache-with-cmake/

An advantage of this approach is that the build will work with or without
ccache installed. We've been using this in production for some time now and
it works very smoothly. The technique can probably also be extended to
support Windows too with clcache <https://github.com/frerich/clcache>, but
I haven't tried that yet.


On Fri, Jan 20, 2017 at 5:00 AM, David Lind <davidklind at gmail.com> wrote:

> I am porting existing makefiles to cmake. One of the key features of these
> makefiles is setting the CCACHE_DIR environment variable based upon the
> tool chain selected.
>
> I have TC_<toolchain>.cmake files created. Ideally, I would add a line to
> these files to set the CCACHE_DIR. But, CMake doesn’t have the ability to
> set environment variables during the build step. So, I’m stuck.
>
> Has anyone encountered this kind of situation?
>
> —Dave
> --
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-- 
Craig Scott
Melbourne, Australia
https://crascit.com
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