Adding Google benchmarking library.

third_party/google_benchmark/.travis.yml

+sudo: required
+dist: trusty
+language: cpp
+
+env:
+  global:
+    - /usr/local/bin:$PATH
+
+# NOTE: The COMPILER variable is unused. It simply makes the display on
+# travis-ci.org more readable.
+matrix:
+    include:
+        - compiler: gcc
+          addons:
+            apt:
+              packages:
+                - lcov
+          env: COMPILER=g++ C_COMPILER=gcc       BUILD_TYPE=Coverage
+        - compiler: gcc
+          env: COMPILER=g++ C_COMPILER=gcc       BUILD_TYPE=Debug
+        - compiler: gcc
+          env: COMPILER=g++ C_COMPILER=gcc       BUILD_TYPE=Release
+        - compiler: gcc
+          addons:
+            apt:
+              packages:
+                - g++-multilib
+          env: COMPILER=g++ C_COMPILER=gcc       BUILD_TYPE=Debug   BUILD_32_BITS=ON
+        - compiler: gcc
+          addons:
+            apt:
+              packages:
+                - g++-multilib
+          env: COMPILER=g++ C_COMPILER=gcc       BUILD_TYPE=Release BUILD_32_BITS=ON
+        - compiler: gcc
+          addons:
+            apt:
+              sources:
+                - ubuntu-toolchain-r-test
+              packages:
+                - g++-6
+          env:
+            - COMPILER=g++-6 C_COMPILER=gcc-6  BUILD_TYPE=Debug
+            - EXTRA_FLAGS="-fno-omit-frame-pointer -g -O2 -fsanitize=undefined,address -fuse-ld=gold"
+        - compiler: clang
+          env: COMPILER=clang++ C_COMPILER=clang BUILD_TYPE=Debug
+        - compiler: clang
+          env: COMPILER=clang++ C_COMPILER=clang BUILD_TYPE=Release
+        # Clang w/ libc++
+        - compiler: clang
+          addons:
+            apt:
+              packages:
+                clang-3.8
+          env:
+            - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=Debug
+            - LIBCXX_BUILD=1
+            - EXTRA_FLAGS="-stdlib=libc++"
+        - compiler: clang
+          addons:
+            apt:
+              packages:
+                clang-3.8
+          env:
+            - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=Release
+            - LIBCXX_BUILD=1
+            - EXTRA_FLAGS="-stdlib=libc++"
+        # Clang w/ 32bit libc++
+        - compiler: clang
+          addons:
+            apt:
+              packages:
+                - clang-3.8
+                - g++-multilib
+          env:
+            - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=Debug
+            - LIBCXX_BUILD=1
+            - BUILD_32_BITS=ON
+            - EXTRA_FLAGS="-stdlib=libc++ -m32"
+        # Clang w/ 32bit libc++
+        - compiler: clang
+          addons:
+            apt:
+              packages:
+                - clang-3.8
+                - g++-multilib
+          env:
+            - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=Release
+            - LIBCXX_BUILD=1
+            - BUILD_32_BITS=ON
+            - EXTRA_FLAGS="-stdlib=libc++ -m32"
+        # Clang w/ libc++, ASAN, UBSAN
+        - compiler: clang
+          addons:
+            apt:
+              packages:
+                clang-3.8
+          env:
+            - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=Debug
+            - LIBCXX_BUILD=1 LIBCXX_SANITIZER="Undefined;Address"
+            - EXTRA_FLAGS="-stdlib=libc++ -fno-omit-frame-pointer -g -O2 -fsanitize=undefined,address -fno-sanitize-recover=all"
+            - UBSAN_OPTIONS=print_stacktrace=1
+        # Clang w/ libc++ and MSAN
+        - compiler: clang
+          addons:
+            apt:
+              packages:
+                clang-3.8
+          env:
+            - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=Debug
+            - LIBCXX_BUILD=1 LIBCXX_SANITIZER=MemoryWithOrigins
+            - EXTRA_FLAGS="-stdlib=libc++ -g -O2 -fno-omit-frame-pointer -fsanitize=memory -fsanitize-memory-track-origins"
+        # Clang w/ libc++ and MSAN
+        - compiler: clang
+          addons:
+            apt:
+              packages:
+                clang-3.8
+          env:
+            - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=RelWithDebInfo
+            - LIBCXX_BUILD=1 LIBCXX_SANITIZER=Thread
+            - EXTRA_FLAGS="-stdlib=libc++ -g -O2 -fno-omit-frame-pointer -fsanitize=thread -fno-sanitize-recover=all"
+
+before_script:
+    - if [ -z "$BUILD_32_BITS" ]; then
+        export BUILD_32_BITS=OFF && echo disabling 32 bit build;
+      fi
+    - if [ -n "${LIBCXX_BUILD}" ]; then
+        source .travis-libcxx-setup.sh;
+      fi
+    - mkdir build && cd build
+
+install:
+  - if [ "${BUILD_TYPE}" == "Coverage" -a "${TRAVIS_OS_NAME}" == "linux" ]; then
+      PATH=~/.local/bin:${PATH};
+      pip install --user --upgrade pip;
+      pip install --user cpp-coveralls;
+    fi
+
+script:
+    - cmake -DCMAKE_C_COMPILER=${C_COMPILER} -DCMAKE_CXX_COMPILER=${COMPILER} -DCMAKE_BUILD_TYPE=${BUILD_TYPE} -DCMAKE_CXX_FLAGS="${EXTRA_FLAGS}" -DBENCHMARK_BUILD_32_BITS=${BUILD_32_BITS} ..
+    - make
+    - make CTEST_OUTPUT_ON_FAILURE=1 test
+
+after_success:
+  - if [ "${BUILD_TYPE}" == "Coverage" -a "${TRAVIS_OS_NAME}" == "linux" ]; then
+      coveralls --include src --include include --gcov-options '\-lp' --root .. --build-root .;
+    fi
+
+sudo: required