diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fdf8f75f6cfc4f99845f77cff699e8b22a3a7534..9cad515c2bef7e44769ce0d452a96ed5bad7e3f0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,9 +1,16 @@
 stages:
+  - prepare
   - linting
   - build
   - test
   - extra
 
+setenv:
+  stage: prepare
+  script:
+    - export CCACHE_NOHASHDIR=1
+    - export CCACHE_BASEDIR=${CI_PROJECT_DIR}
+
 cpplint:
   stage: linting
   script:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9714b1456a1ecdc227b5861d114f09f7464cae97..1e0963e6fb92bf7118f7cbdb16de7a00efb738eb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,9 +15,18 @@ option(MACE_ENABLE_BENCHMARKS  "whether to build c++ micro benchmarks"      OFF)
 option(MACE_ENABLE_EXAMPLES    "whether to build examples"                  OFF)
 option(MACE_ENABLE_OPT_SIZE    "whether to build with optimized binary size" ON)
 option(MACE_ENABLE_OBFUSCATE   "whether to build with code obfuscation"      ON)
+option(MACE_ENABLE_CCACHE      "whether to build with ccache"                ON)
 
 message("CMAKE_INSTALL_PREFIX: ${CMAKE_INSTALL_PREFIX}")
 
+if(MACE_ENABLE_CCACHE)
+  find_program(CCACHE_FOUND ccache)
+  if(CCACHE_FOUND)
+    set(CMAKE_CXX_COMPILER_LAUNCHER ccache)
+    set(CMAKE_C_COMPILER_LAUNCHER   ccache)
+  endif(CCACHE_FOUND)
+endif(MACE_ENABLE_CCACHE)
+
 # TODO make these flags well defined and organized
 # TODO enable sanitizer
 set(MACE_CC_FLAGS "${MACE_CC_FLAGS} -fPIC")
@@ -33,7 +42,9 @@ if(MACE_ENABLE_OPT_SIZE)
 endif(MACE_ENABLE_OPT_SIZE)
 
 # flags apply only to mace code (third_party excluded)
-set(MACE_CODE_CC_FLAGS "${MACE_CODE_CC_FLAGS} -Wall -Werror")
+# -Wno-error=unused-command-line-argument: official Android toolchain contains
+# unsupported argument and will break ccache preprocessor
+set(MACE_CODE_CC_FLAGS "${MACE_CODE_CC_FLAGS} -Wall -Werror -Wno-error=unused-command-line-argument")
 set(MACE_CODE_CC_FLAGS "${MACE_CODE_CC_FLAGS} -std=c++11 -D_GLIBCXX_USE_C99_MATH_TR1")
 
 if(IOS)
diff --git a/docker/mace-dev/Dockerfile b/docker/mace-dev/Dockerfile
index 8bb31a7d3a33c4c4d886f170c54fd7ca3d0b6d7d..5ae643a96e1ca49732982182d52d38ee1936a463 100644
--- a/docker/mace-dev/Dockerfile
+++ b/docker/mace-dev/Dockerfile
@@ -111,3 +111,6 @@ RUN pip install -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors
 
 RUN pip install -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com \
     cpplint==1.4.4
+
+RUN apt-get install -y --no-install-recommends \
+    ccache
diff --git a/mace/core/quantize.h b/mace/core/quantize.h
index 00fb3db9121d6add2d16507f1bf7b1b3a92fadf3..c7b6666dda378e99ad7a99714a6c7dca74b41619 100644
--- a/mace/core/quantize.h
+++ b/mace/core/quantize.h
@@ -100,7 +100,6 @@ inline void QuantizeMultiplier(double multiplier,
     ++*shift;
   }
   *output_multiplier = static_cast<int32_t>(qint);
-  MACE_CHECK(*output_multiplier <= std::numeric_limits<int32_t>::max());
 }
 
 inline void GetOutputMultiplierAndShift(
diff --git a/third_party/gflags/gflags.cmake b/third_party/gflags/gflags.cmake
index ded60019268e59a87e8acd612572a606a9562ebd..1134718ca28ef9fd09d62f0aba37120e0f60831d 100644
--- a/third_party/gflags/gflags.cmake
+++ b/third_party/gflags/gflags.cmake
@@ -24,6 +24,9 @@ ExternalProject_Add(
   UPDATE_COMMAND   ""
   BUILD_BYPRODUCTS ${GFLAGS_LIBRARIES}
   CMAKE_ARGS       -DCMAKE_INSTALL_PREFIX=${GFLAGS_INSTALL_DIR}
+                   -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+                   -DCMAKE_CXX_COMPILER_LAUNCHER=${CMAKE_CXX_COMPILER_LAUNCHER}
+                   -DCMAKE_C_COMPILER_LAUNCHER=${CMAKE_C_COMPILER_LAUNCHER}
                    -DBUILD_STATIC_LIBS=ON
                    -DBUILD_TESTING=OFF
                    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
diff --git a/third_party/googletest/googletest.cmake b/third_party/googletest/googletest.cmake
index 6b715c877003429fd65b8608a935e5e1887af43a..f5dd0974839275a9475f50f580399cc0aa061451 100644
--- a/third_party/googletest/googletest.cmake
+++ b/third_party/googletest/googletest.cmake
@@ -32,7 +32,10 @@ if(MACE_ENABLE_TESTS)
     PREFIX           ${GTEST_SOURCES_DIR}
     UPDATE_COMMAND   ""
     BUILD_BYPRODUCTS ${GTEST_LIBRARIES} ${GTEST_MAIN_LIBRARIES}
-    CMAKE_ARGS       -DCMAKE_INSTALL_PREFIX=${GTEST_INSTALL_DIR}
+    CMAKE_ARGS       -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+                     -DCMAKE_CXX_COMPILER_LAUNCHER=${CMAKE_CXX_COMPILER_LAUNCHER}
+                     -DCMAKE_C_COMPILER_LAUNCHER=${CMAKE_C_COMPILER_LAUNCHER}
+                     -DCMAKE_INSTALL_PREFIX=${GTEST_INSTALL_DIR}
                      -DBUILD_GMOCK=ON
                      -Dgtest_disable_pthreads=ON
                      -Dgtest_force_shared_crt=ON
diff --git a/third_party/protobuf/protobuf.cmake b/third_party/protobuf/protobuf.cmake
index 4f95317de46f6e420f697d10ac9361c2881b2156..d38635136387c5f82b04b0a3b0a43b18fcd908dd 100644
--- a/third_party/protobuf/protobuf.cmake
+++ b/third_party/protobuf/protobuf.cmake
@@ -33,7 +33,9 @@ ExternalProject_Add(
   BUILD_BYPRODUCTS  ${PROTOBUF_LITE_LIBRARIES}
   SOURCE_DIR        "${PROTOBUF_SRCS_DIR}/src/protobuf"
   CONFIGURE_COMMAND ${CMAKE_COMMAND} ../protobuf/cmake/
-  #-DCMAKE_BUILD_TYPE=Release
+                    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+                    -DCMAKE_CXX_COMPILER_LAUNCHER=${CMAKE_CXX_COMPILER_LAUNCHER}
+                    -DCMAKE_C_COMPILER_LAUNCHER=${CMAKE_C_COMPILER_LAUNCHER}
                     -DCMAKE_INSTALL_PREFIX=${PROTOBUF_INSTALL_DIR}
                     -DCMAKE_VERBOSE_MAKEFILE=OFF
                     -Dprotobuf_BUILD_TESTS=OFF
@@ -90,6 +92,8 @@ if(BUILD_PROTOC)
       SOURCE_DIR        "${PROTOC_SRCS_DIR}/src/protoc"
       CONFIGURE_COMMAND ${CMAKE_COMMAND} ../protoc/cmake/
       -DCMAKE_BUILD_TYPE=Release
+      -DCMAKE_CXX_COMPILER_LAUNCHER=${CMAKE_CXX_COMPILER_LAUNCHER}
+      -DCMAKE_C_COMPILER_LAUNCHER=${CMAKE_C_COMPILER_LAUNCHER}
       -DCMAKE_INSTALL_PREFIX=${PROTOC_INSTALL_DIR}
       -DCMAKE_VERBOSE_MAKEFILE=OFF
       -Dprotobuf_BUILD_TESTS=OFF