Add OSX to CI (open-telemetry#20)

* Add OSX to CI

* Fix yaml

* Fix osx build.

* Update xcode.

* Change build dir default path.

* Fix path

* Alias bazel on osx.

* set up bazel symbol link on osx

Author: rnburn

.circleci/config.yml

@@ -14,7 +14,7 @@ jobs:
       - run: ./ci/setup_cmake.sh
       - run: ./ci/do_ci.sh cmake.test
       - store_artifacts:
-          path: /build/Testing/Temporary/LastTest.log
+          path: ~/build/Testing/Temporary/LastTest.log
           destination: Test.log
 
   bazel_test:
@@ -27,6 +27,14 @@ jobs:
       - run: ./ci/install_bazelisk.sh
       - run: ./ci/do_ci.sh bazel.test
 
+  osx_test:
+    macos:
+      xcode: "11.0.0"
+    steps:
+      - checkout
+      - run: ./ci/install_osx_bazelisk.sh
+      - run: ./ci/do_ci.sh bazel.test
+
   windows:
     executor: win/vs2019
     steps:
@@ -41,4 +49,5 @@ workflows:
     jobs:
       - cmake_test
       - bazel_test
+      - osx_test
       - windows

ci/do_ci.sh

@@ -3,7 +3,7 @@
 set -e
 
 [ -z "${SRC_DIR}" ] && export SRC_DIR="`pwd`"
-[ -z "${BUILD_DIR}" ] && export BUILD_DIR=/build
+[ -z "${BUILD_DIR}" ] && export BUILD_DIR=$HOME/build
 mkdir -p "${BUILD_DIR}"
 
 BAZEL_OPTIONS=""

ci/install_osx_bazelisk.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -e
+
+brew install bazelisk
+sudo ln -s /usr/local/bin/bazelisk /usr/local/bin/bazel