[RDY] Small Travis-related improvements.

[fwalch]

• Add install test to 32-bit build.
• Add flag to force building of dependencies. PRs such as [RFC] Update to libuv 1.0.1. #1542 can temporarily set this to test that using changed third-party dependencies works.

[tarruda]

👍

[jszakmeister]

I like the spirit of this. It looks like it failed because libtool is missing.

[fwalch]

Added another commit to search for core dumps differently (found e.g. ./.deps/build/src/libuv/src/unix/core.c).

[fwalch]

Build works now, so marking RFC. I want to wait for #1572, though, to make sure that building the dependencies works on OS X as well. The Test that setting the deps flag works. commit will be removed after that.

[fwalch]

Added another commit to not set the core file size, since I've seen the following in build logs:

bash: line 0: ulimit: core file size: cannot modify limit: Operation not permitted

[fwalch]

I want to wait for #1572, though, to make sure that building the dependencies works on OS X as well.

Reconsidering this, if this PR is merged before #1572, OS X dependency building can just be tested in #1572. So if someone wants to review this PR, please go ahead :-)

The "Test that setting the deps flag works." commit will be removed before setting this RDY.

[justinmk]

Comment is somewhat confusing, how about

# To test third-party dependencies, set this to 'true'.

[fwalch]

👍

[justinmk]

Nice changes, LGTM

[justinmk]

The functional tests seem very slow on travis...

[fwalch]

@justinmk Yes.. I think it depends on the Travis worker, e.g. clang-asan took 15min on master vs 8min in this PR's build (despite this PR building the 3rd party deps as well).

[fwalch]

The rebased build passed, so I removed the test commit; marking RDY.