Change Travis config to utilize Build Stages

See: https://docs.travis-ci.com/user/build-stages/

.travis.yml

@@ -1,20 +1,14 @@
-os:
-    - linux
-    - osx
-
 sudo: false
 
 language: c
 
-compiler:
+jobs:
-    - gcc
-    - clang
-
-matrix:
     include:
-        - compiler: gcc
+        # Build with gcc and run tests on Ubuntu.
-          env: COVERAGE="--disable-valgrind --enable-gcov"
+        -   &test-ubuntu
+            stage: test
             os: linux
+            compiler: gcc
 
             addons:
                 apt:
@@ -24,11 +18,7 @@ addons:
                         - automake
 
             before_install:
-    - echo "$TRAVIS_OS_NAME"
                 - uname -s
-    - brew update               || true;
-      brew install flex         || true;
-      brew install bison        || true;
                 - rvm install ruby-1.9.3-p551
                 - rvm use 1.9.3
                 - rm src/{lexer,parser}.{c,h}
@@ -77,18 +67,50 @@ script:
                 - make -j4
                 - make check -j4
 
-after_script:
-    - |
-        if [ -n "$COVERAGE" ]; then
-            rm -rf src/.libs # don't care about coverage for libjq
-            coveralls --gcov-options '\-lp' \
-                -e src/lexer.c -e src/parser.c -e src/jv_dtoa.c
-        fi
-
             after_failure:
                 - cat test-suite.log
                 - cat tests/*.log
 
+
+        # Build with clang and run tests on Ubuntu.
+        -   <<: *test-ubuntu
+            compiler: clang
+
+
+        # Build with gcc and run tests with gcov on Ubuntu.
+        -   <<: *test-ubuntu
+            env: COVERAGE="--disable-valgrind --enable-gcov"
+
+            after_script:
+                - rm -rf src/.libs # don't care about coverage for libjq
+                - coveralls --gcov-options '\-lp'
+                    -e src/lexer.c -e src/parser.c -e src/jv_dtoa.c
+
+
+        # Build with gcc and run tests on macOS.
+        -   &test-osx
+            <<: *test-ubuntu
+            os: osx
+
+            before_install:
+                - uname -s
+                - brew update
+                - brew install flex
+                - brew install bison
+                - rvm install ruby-1.9.3-p551
+                - rvm use 1.9.3
+                - rm src/{lexer,parser}.{c,h}
+                - sed -i.bak '/^AM_INIT_AUTOMAKE(\[-Wno-portability 1\.14\])$/s/14/11/' modules/oniguruma/configure.ac
+
+            install:
+                - bundle install --gemfile=docs/Gemfile
+                - if [ -n "$COVERAGE" ]; then pip install --user cpp-coveralls; fi
+
+
+        # Build with clang and run tests on macOS.
+        -   <<: *test-osx
+            compiler: clang
+
 notifications:
     email: false