Chore: rework Bazel build system

.bazelrc

@@ -13,12 +13,29 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-build --copt -DHAVE_ZLIB=1
-# bazel build with glog
-# build --define=with_glog=true
-build -c opt
-build --incompatible_disable_deprecated_attr_params=false
-build --incompatible_new_actions_api=false
-# unittest 
-test --define=unittest=true
-test --copt=-g
+#
+# Default build options. These are applied first and unconditionally.
+#
+
+build --cxxopt="-std=c++11"
+# Use gnu11 for asm keyword.
+build --conlyopt="-std=gnu11"
+
+# Enable position independent code (this is the default on macOS and Windows)
+# (Workaround for https://github.com/bazelbuild/rules_foreign_cc/issues/421)
+build --copt=-fPIC
+build --fission=dbg,opt
+build --features=per_object_debug_info
+
+# We already have absl in the build, define absl=1 to tell googletest to use absl for backtrace.
+build --define absl=1
+
+# For brpc.
+build --define=BRPC_WITH_GLOG=true
+test --define=BRPC_BUILD_FOR_UNITTEST=true
+
+# Pass PATH, CC, CXX and LLVM_CONFIG variables from the environment.
+build --action_env=CC
+build --action_env=CXX
+build --action_env=LLVM_CONFIG
+build --action_env=PATH

.bazelversion

@@ -0,0 +1 @@
+4.2.2

.travis.yml

@@ -40,7 +40,7 @@ before_script:
 - sudo bash -c "echo 'core.%e.%p' > /proc/sys/kernel/core_pattern"
 
 before_install:
-- wget --no-clobber https://github.com/bazelbuild/bazel/releases/download/0.25.1/bazel_0.25.1-linux-x86_64.deb && sudo dpkg -i bazel_0.25.1-linux-x86_64.deb
+- wget --no-clobber https://github.com/bazelbuild/bazel/releases/download/4.2.2/bazel_4.2.2-linux-x86_64.deb && sudo dpkg -i bazel_4.2.2-linux-x86_64.deb
 - sudo apt-get install automake bison flex g++ git libboost-all-dev libevent-dev libssl-dev libtool make pkg-config # thrift dependencies
 - wget http://www.apache.org/dist/thrift/0.11.0/thrift-0.11.0.tar.gz && tar -xf thrift-0.11.0.tar.gz && cd thrift-0.11.0/ && ./configure --prefix=/usr --with-rs=no --with-ruby=no --with-python=no --with-java=no --with-go=no --with-perl=no --with-php=no --with-csharp=no --with-erlang=no --with-lua=no --with-nodejs=no CXXFLAGS="-Wno-unused-variable" && make -j4 && sudo make install && cd -