Decrease Travis CI build duration

[phuedx]

By building against a pre-built version of ØMQ we can dramatically reduce the Travis CI build duration at the cost of increasing the size of the repo. The following is from the email I received about the latest build of phuedx/php-zmq:

Build Update for phuedx/php-zmq

Build: #10
Status: Passed

Duration: 9 minutes and 51 seconds

As for the increase in size of the repo: du -sm /path/to/php-zmq/travis/ reports that the travis directory is 79 MB but git clone https://url/of/php-zmq reports that it receives 13.19 MB of compressed objects in total.

Alternatively, we could always reduce the size of the Travis CI build matrix…

[wysman]

Maybe create a dedicated repo and clone it during travis setup will better.
It's avoid to add lot of source and binary in the main repo.

[phuedx]

@wysman That's an elegant solution. How does php-zmq-travis-support sound?

[wysman]

sound good ;)

[wysman]

or zmq-travis-support, it's not php specific

[phuedx]

travis/script.sh is a modified version of run-tests.sh, which will try to use the pre-built version of ØMQ from phuedx/php-zmq-travis-support. It's also been tidied up according to the Git coding guidelines.

[phuedx]

Also, if you're happy with the style changes that made to travis/script.sh, then I'll submit a separate PR with the same changes to run-tests.sh.

[phuedx]

On the other hand, I could simply remove run-tests.sh…

[mkoppanen]

Looks good to me and the build passes

[phuedx]

@mkoppanen Do you want to take control of phuedx/php-zmq-travis-support?

[wysman]

I just read that travis can cache a specific folder between run.
I think it's a better solution to have build script only, and let's travis do the cache

http://docs.travis-ci.com/user/caching/#Arbitrary-directories

[phuedx]

@wysman That's a great find! That gets rid of the dependency on the external repo while keeping the build time down.

[wysman]

And it's avoid to host binary on Github !