Mac release failures -- box-box intersection

[SeanCurtis-TRI]

PR #259 introduced code that is apparently failing in CI. It specifically fails in mac release builds. Across all tests, no collisions are being reported.

[sherm1]

@mamoll reported this in #271:

Unit tests pass on my Mac, OS X 10.13.3, Xcode 9.2, Boost 1.66 and libccd 2.0 (the last two installed via MacPorts).

[ericberberich]

I have seen test_fcl_capsule_box_1 here on Xcode 9.x - it's the gjksolver instantiated with libccd that produces the wrong result .... the TravisCI for Linux uses libccd 1.5 - so I downgraded to it - but it still appears ... I will have another look into it - any idea which direction to search?

@mamoll you still see the problem or not?

[mamoll]

Note that MacPorts installs libccd with double precision by default (-DCCD_DOUBLE=true). Maybe TravisCI has libccd with single precision installed and that's what's causing the failure?

[jslee02]

FYI, Travis CI installs libccd using Homebrew, and Homebrew installs libccd with double precision by default.

[geoynomous]

So libccd is always with double precision in all your TravisCI setups?

[SeanCurtis-TRI]

This is no longer true. A modicum of archaeology was insufficient to point to the exact solution. So, I'm giving up on that. CI passes; 'nuff said.