Fix mac build (#41)

- There is no libatomic in MacOS clang(and maybe some other environment), so check if libatomic existed before link.
- Added MacOS build to travis. For TSAN build , a unused-command-line-argument is defined in RocksDB cmake file, witch will fail compilation on MacOS, skip it.

.gitignore

@@ -8,3 +8,4 @@ titandb_stress
 build/
 .idea/
 .vscode/
+cmake-build-debug/

.travis.yml

@@ -4,6 +4,9 @@ language: cpp
 
 os:
   - linux
+  - osx
+compiler: clang
+osx_image: xcode10.2
 
 addons:
   apt:
@@ -16,21 +19,37 @@ addons:
       - lcov
       - clang-format-7
 
+env:
+  - BUILD_TYPE="Release"
+  - SANITIZER="ASAN"
+  - SANITIZER="TSAN"
+  - SANITIZER="UBSAN"
+
 # For GCC build, we also report code coverage to codecov.
 matrix:
-  include:
-    - compiler: clang
-      env: BUILD_TYPE="Release"
-    - compiler: clang
-      env: SANITIZER="ASAN"
-    - compiler: clang
+  exclude:
+    - os: osx
       env: SANITIZER="TSAN"
-    - compiler: clang
+    - os: osx
       env: SANITIZER="UBSAN"
-    - env: COMPILER=gcc7
-    - env: FORMATTER=ON
+    - os: osx
+      env: BUILD_TYPE="Release"
+  include:
+    - os: linux
+      compiler:
+      env:
+        - COMPILER=gcc7
+    - os: linux
+      compiler:
+      env:
+        - FORMATTER=ON
+
 
 install:
+  # osx dependencies
+  - if [ "${TRAVIS_OS_NAME}" == osx ]; then
+      brew install gflags zstd lz4 snappy xz;
+    fi
   - git clone --depth=1 --branch=tikv-3.0 https://github.com/pingcap/rocksdb.git
   - export CTEST_OUTPUT_ON_FAILURE=1
   - if [ "${COMPILER}" == gcc7 ]; then

CMakeLists.txt

@@ -57,7 +57,11 @@ endif()
 if (WITH_TITAN_TESTS OR WITH_TITAN_TOOLS)
   add_subdirectory(${ROCKSDB_DIR} rocksdb EXCLUDE_FROM_ALL)
   # -latomic is needed when building titandb_stress using clang.
+  # check if libatomic exist before link
+  find_library(HAS_ATOMIC NAMES atomic libatomic.so.1 atomic.so.1)
+  if (HAS_ATOMIC)
     link_libraries(atomic)
+  endif()
 endif()
 
 if (WITH_TITAN_TESTS AND (NOT CMAKE_BUILD_TYPE STREQUAL "Release"))
@@ -98,9 +102,11 @@ if (WITH_TITAN_TOOLS)
   else()
     # Hack: On Travis (with Ubuntu xenial or before), libgflags-dev package doesn't come with
     # gflags-config.cmake, so find_package will fail. Hard-code gflag path for now.
+    if (NOT APPLE)
       set(gflags_INCLUDE_DIR "/usr/include/gflags")
       list(APPEND TOOLS_LIBS "/usr/lib/x86_64-linux-gnu/libgflags.a")
     endif()
+  endif()
   add_definitions(-DGFLAGS)
 
   add_executable(titandb_stress tools/titandb_stress.cc)