Specify osx_image for mac build on Travis-CI
To avoid unexpected build failures when the default toolchain on
Travis-CI is changed, this CL explicitly specifies that we want to use
Xcode 6.4 running on OS X 10.10.
See the following document about what options are available.
https://docs.travis-ci.com/user/osx-ci-environment/
BUG=
TEST=compile
REF_BUG=
REF_CL=
REF_TIME=2016-10-02T23:56:40-07:00
REF_TIME_RAW=1475477800 -0700
Yohei Yukawa
7 years ago