this enables and implements full support for ccache on travis builds
fix T7126
Differential Revision: https://phab.enlightenment.org/D6605
=also includes previously-submitted patches=
ci: split out ccache config setup into separate script
this provides a more unified place to set ccache options
also enable ccache compression to cut down on cache upload/download overhead
ref D6613
ci: zero ccache stats before build and add some comments for options used
zeroing the stats before each build will provide more insight into the cache
performance for each build
ref D6621
ci: break out ccache stat printing into separate script
continue to make travis.yml more readable
ref D6622
ci: add more ccache config options to improve cache direct hits
ci: disable second cpp run for ccache
this should avoid running cpp twice for files
https://ccache.samba.org/manual.html#_the_preprocessor_mode
this moves each step of the ci build into a separate script with the build
type passed as an argument, allowing for easier modification of each individual
step as necessary and making travis.yml more readable
Differential Revision: https://phab.enlightenment.org/D6604
also includes:
ci: break out make commands into travis.yml from build scripts
this simplifies the platform-specific build scripts to only perform
the configure stage of the build (and any additional setup) and then
uses standardized commands for the build
in addition to being simpler, this will also provide more/better info
about build timings
ref D6603
Mike Blumenkrantz