HBASE-18901 [C++] Provide CMAKE infrastructure

* Provided cmake files for packages in which a default module did not exist. * Moved tests to a location where we could automatically build the test suite. * Resolved minor issues with tests * Tested across OSX, RHEL7, and Ubuntu16 HBASE-18901 [C++] Cleanup CMAKE JJELSER: A hack to get the protobuf-gen headers installed too. Admittedly, not sure if there is a better way to do it. HBASE-18901 [C++] Fix PROTOBUF_LIBRARY by removing static override in FindZookeeper HBASE-18901 [C++] Remove white space lines and clean up CMAKE
apache · Oct 12, 2017 · 5ed5927 · 5ed5927
1 parent e2bb10a
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diff --git a/hbase-native-client/CMakeLists.txt b/hbase-native-client/CMakeLists.txt
@@ -0,0 +1,188 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+#
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+cmake_minimum_required(VERSION 3.0)
+PROJECT(hbaseclient CXX)
+set(PROJECT_NAME "hbaseclient")
+set(PROJECT_VERSION_MAJOR 0)
+set(PROJECT_VERSION_MINOR 1 )
+set(PROJECT_VERSION_PATCH 0)
+set(BUILD_SHARED_LIBS ON)
+## set our cmake module path
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+## include the Protobuf generation code
+include(ProtobufGen)
+if(COMPILER_SUPPORTS_CXX14)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
+else()
+    message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++14 support. Please use a different C++ compiler.")
+endif()
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(HBASE_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}/src/hbase")
+set(HBASE_PROTO_GEN_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}/src/hbase/if")
+set(HBASE_PROTO_GEN_INC_DIR "${CMAKE_CURRENT_SOURCE_DIR}/include/hbase/if")
+# Set the right openssl root path
+if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+    set(OPENSSL_ROOT_DIR "/usr/local/opt/openssl/")
+else()
+    set(OPENSSL_ROOT_DIR "/usr/lib/x86_64-linux-gnu")
+endif()
+# Include OpenSSL
+find_package (OpenSSL REQUIRED)
+if (OPENSSL_FOUND)
+    include_directories(${OPENSSL_INCLUDE_DIR})
+else ()
+    message( FATAL_ERROR "OpenSSL was not found. Please install OpenSSL" )
+endif (OPENSSL_FOUND)
+# ensure we have required dependencies
+find_package(Threads)
+find_package(Boost REQUIRED COMPONENTS thread system filesystem)
+find_package(Gflags REQUIRED)
+find_package(Folly REQUIRED)
+find_package(Krb5 REQUIRED)
+find_package(Sasl2 REQUIRED)
+find_package(Wangle REQUIRED)
+find_package(GTest)
+find_package(Glog)
+find_package(Java REQUIRED)
+find_package(JNI REQUIRED)
+find_package(Zookeeper REQUIRED)
+find_package(Protobuf REQUIRED)
+if (NOT FOLLY_FOUND)
+ message(FATAL_ERROR "-- Folly not found")
+endif()
+if (NOT WANGLE_FOUND)
+ message(FATAL_ERROR "-- Wangle not found")
+endif()
+if (NOT PROTOBUF_FOUND)
+	message(FATAL_ERROR "-- Protocol buffer include directory not found ${PROTOBUF_INCLUDE_DIRS}")
+endif()
+if (NOT JNI_FOUND)
+        message(FATAL_ERROR "-- JAVA include directory not found")
+endif()
+### provide the include directories, starting at the base
+### and including those from our 
+include_directories(include)
+include_directories(${PROTOBUF_INCLUDE_DIRS})
+include_directories(${Zookeeper_INCLUDE_DIRS})
+include_directories(${Boost_INCLUDE_DIR})
+include_directories(${KRB5_INCLUDE_DIRS})
+include_directories(${JAVA_INCLUDE_DIRS})
+include_directories(${FOLLY_INCLUDE_DIRS})
+### create a directory for the hbase protobuf headers.
+### this is helpful so that when we include it, later, we can generate 
+### the protocol buffer source/headers without polluting our tree. 
+set(CMAKE_BINARY_DIR_GEN "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/hbase/if/")
+file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR_GEN})
+## build a recursive list of sources
+file(GLOB_RECURSE CONNECTION_SRC "${HBASE_SRC_DIR}/connection/*.cc"  )
+file(GLOB_RECURSE EXCEPTION_SRC "${HBASE_SRC_DIR}/exceptions/*.cc"  )
+file(GLOB_RECURSE PROTO_SRC "${HBASE_SRC_DIR}/if/*.cc"  )
+file(GLOB_RECURSE UTILS_SRC "${HBASE_SRC_DIR}/utils/*.cc"  )
+file(GLOB_RECURSE CLIENT_SRC "${HBASE_SRC_DIR}/client/*.cc"  )
+file(GLOB_RECURSE SECURITY_SRC "${HBASE_SRC_DIR}/security/*.cc"  )
+file(GLOB_RECURSE SRDE_SRC "${HBASE_SRC_DIR}/serde/*.cc"  )
+file(GLOB_RECURSE TEST_UTIL "${HBASE_SRC_DIR}/test-util/*.cc"  )
+include_directories(${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_FILES_DIRECTORY})
+include_directories(${SASL_INCLUDE_DIRS})
+include_directories(${GFLAGS_INCLUDE_DIR})
+file(GLOB_RECURSE PROTO_FILES "${HBASE_SRC_DIR}/if/*.proto"  )
+### generate the protocol buffers. 
+generate_protobuf_src(PROTO_SOURCES PROTO_HEADERS  ${PROTO_FILES})
+
+
+add_library(hbaseclient-static STATIC ${PROTO_SOURCES} ${CLIENT_SRC} ${CONNECTION_SRC} ${EXCEPTION_SRC} ${PROTO_SRC} ${SECURITY_SRC} ${SRDE_SRC} ${UTILS_SRC})
+set_target_properties(hbaseclient-static PROPERTIES LINKER_LANGUAGE CXX)
+SET_TARGET_PROPERTIES(hbaseclient-static PROPERTIES OUTPUT_NAME hbaseclient CLEAN_DIRECT_OUTPUT 1)
+target_link_libraries(hbaseclient-static ${PROTOBUF_LIBRARY})
+target_link_libraries(hbaseclient-static ${FOLLY_LIBRARIES})
+target_link_libraries(hbaseclient-static ${Boost_LIBRARIES})
+target_link_libraries(hbaseclient-static ${SASL_LIBS})
+target_link_libraries(hbaseclient-static ${GLOG_SHARED_LIB})
+target_link_libraries(hbaseclient-static ${GFLAGS_SHARED_LIB})
+target_link_libraries(hbaseclient-static ${KRB5_LIBRARIES})
+target_link_libraries(hbaseclient-static ${WANGLE_LIBRARIES})
+target_link_libraries(hbaseclient-static ${Zookeeper_LIBRARIES})
+target_link_libraries(hbaseclient-static ${OPENSSL_LIBRARIES})
+add_library(hbaseclient-shared SHARED ${PROTO_SOURCES} ${CLIENT_SRC} ${CONNECTION_SRC} ${EXCEPTION_SRC} ${PROTO_SRC} ${SECURITY_SRC} ${SRDE_SRC} ${UTILS_SRC})
+set_target_properties(hbaseclient-shared PROPERTIES LINKER_LANGUAGE CXX)
+SET_TARGET_PROPERTIES(hbaseclient-shared PROPERTIES COMPILE_FLAGS " -fPIC")
+SET_TARGET_PROPERTIES(hbaseclient-shared PROPERTIES OUTPUT_NAME hbaseclient CLEAN_DIRECT_OUTPUT 1)
+target_link_libraries(hbaseclient-shared ${PROTOBUF_LIBRARY})
+target_link_libraries(hbaseclient-shared ${FOLLY_LIBRARIES})
+target_link_libraries(hbaseclient-shared ${Boost_LIBRARIES})
+target_link_libraries(hbaseclient-shared ${SASL_LIBS})
+target_link_libraries(hbaseclient-shared ${GLOG_SHARED_LIB})
+target_link_libraries(hbaseclient-shared ${GFLAGS_SHARED_LIB})
+target_link_libraries(hbaseclient-shared ${KRB5_LIBRARIES})
+target_link_libraries(hbaseclient-shared ${WANGLE_LIBRARIES})
+target_link_libraries(hbaseclient-shared ${Zookeeper_LIBRARIES})
+add_executable(simple-client "${HBASE_SRC_DIR}/examples/simple-client.cc")
+SET_TARGET_PROPERTIES(simple-client PROPERTIES COMPILE_FLAGS "  ")
+target_link_libraries(simple-client ${PROTOBUF_LIBRARY})
+target_link_libraries(simple-client ${Boost_LIBRARIES})
+target_link_libraries(simple-client ${SASL_LIBS})
+target_link_libraries(simple-client ${GFLAGS_SHARED_LIB})
+target_link_libraries(simple-client ${KRB5_LIBRARIES})
+target_link_libraries(simple-client ${Zookeeper_LIBRARIES})
+target_link_libraries(simple-client hbaseclient-static ${CMAKE_THREAD_LIBS_INIT})
+add_executable(load-client "${HBASE_SRC_DIR}/examples/load-client.cc")
+SET_TARGET_PROPERTIES(load-client PROPERTIES COMPILE_FLAGS "  ")
+target_link_libraries(load-client ${PROTOBUF_LIBRARY})
+target_link_libraries(load-client ${Boost_LIBRARIES})
+target_link_libraries(load-client ${SASL_LIBS})
+target_link_libraries(load-client ${GFLAGS_SHARED_LIB})
+target_link_libraries(load-client ${KRB5_LIBRARIES})
+target_link_libraries(load-client ${Zookeeper_LIBRARIES})
+target_link_libraries(load-client hbaseclient-static ${CMAKE_THREAD_LIBS_INIT})
+if (JNI_FOUND)
+    message (STATUS "JNI_INCLUDE_DIRS=${JNI_INCLUDE_DIRS}")
+    message (STATUS "JNI_LIBRARIES=${JNI_LIBRARIES}")
+endif()
+if (NOT SKIP_TESTS)
+	include(BuildTests)
+endif()
+## Create a custom target for our linter
+add_custom_target(
+    linter
+    COMMAND ${CMAKE_SOURCE_DIR}/bin/cpplint.sh)
+
+# Install library headers
+include(GNUInstallDirs)
+file(GLOB RECURSE HEADERS include/*.h)
+set_target_properties(hbaseclient-static PROPERTIES PUBLIC_HEADER "${HEADERS}")
+install(TARGETS hbaseclient-static
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    PUBLIC_HEADER DESTINATION include/
+    COMPONENT LIBRARY ) 
+install(TARGETS hbaseclient-shared
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    PUBLIC_HEADER DESTINATION include/
+    COMPONENT LIBRARY )
+INSTALL (
+    DIRECTORY ${CMAKE_SOURCE_DIR}/include/
+    DESTINATION include/
+    FILES_MATCHING PATTERN "*.h*")
+# Install pb-generated headers too
+ INSTALL (
+     DIRECTORY "${CMAKE_BINARY_DIR_GEN}"
+     DESTINATION include/hbase/if
+     FILES_MATCHING PATTERN "hbase/if/*.h")
diff --git a/hbase-native-client/bin/cpplint.sh b/hbase-native-client/bin/cpplint.sh
@@ -16,9 +16,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 IFS=$'\n\t'
-
+OUTPUT_DIR=$1
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 CPPLINT_LOC=https://raw.githubusercontent.com/google/styleguide/gh-pages/cpplint/cpplint.py
-OUTPUT=build/cpplint.py
+OUTPUT=$OUTPUT_DIR/cpplint.py
 
 declare -a MODULES=( client connection exceptions security serde utils test-util )
 
@@ -31,9 +32,9 @@ wget -nc $CPPLINT_LOC -O $OUTPUT
 #                              build/c++11 (We are building with c++14)
 for m in ${MODULES[@]}; do
   if [ $m != "security" ]; then  #These are empty
-    exec find src/hbase/$m -name "*.h" -or -name "*.cc" | xargs -P8 python $OUTPUT --filter=-build/header_guard,-readability/todo,-build/c++11 --linelength=100
+    exec find ${SCRIPT_DIR}/../src/hbase/$m -name "*.h" -or -name "*.cc" | xargs -P8 python $OUTPUT --filter=-build/header_guard,-readability/todo,-build/c++11 --linelength=100
   fi
   if [ $m != "test-util" ]; then
-    exec find include/hbase/$m -name "*.h" -or -name "*.cc" | xargs -P8 python $OUTPUT --filter=-build/header_guard,-readability/todo,-build/c++11 --linelength=100
+    exec find ${SCRIPT_DIR}/../include/hbase/$m -name "*.h" -or -name "*.cc" | xargs -P8 python $OUTPUT --filter=-build/header_guard,-readability/todo,-build/c++11 --linelength=100
   fi
 done
diff --git a/hbase-native-client/cmake/BuildTests.cmake b/hbase-native-client/cmake/BuildTests.cmake
@@ -0,0 +1,80 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+### test functions
+MACRO(GETSOURCEFILES result curdir)
+  FILE(GLOB children RELATIVE ${curdir} ${curdir}/*)
+  SET(dirlist "")
+  FOREACH(child ${children})
+    IF( "${child}" MATCHES ^[^.].*\\.cc)
+
+      LIST(APPEND dirlist ${child})
+    ENDIF()
+  ENDFOREACH()
+  SET(${result} ${dirlist})
+ENDMACRO()
+find_package(GMock REQUIRED)
+add_library(testutil STATIC ${TEST_UTIL})
+target_include_directories(testutil PRIVATE BEFORE "include")
+target_include_directories(testutil PRIVATE BEFORE "${Java_INCLUDE_DIRS}")		
+target_include_directories(testutil PRIVATE BEFORE "${JNI_INCLUDE_DIRS}")	
+target_include_directories(testutil PRIVATE BEFORE "${Boost_INCLUDE_DIR}")	
+target_include_directories(testutil PRIVATE BEFORE "${GTEST_INCLUDE_DIRS}")	
+target_include_directories(testutil PRIVATE BEFORE${PROTOBUF_INCLUDE_DIRS})
+target_include_directories(testutil PRIVATE BEFORE${Zookeeper_INCLUDE_DIRS})
+target_include_directories(testutil PRIVATE BEFORE${KRB5_INCLUDE_DIRS})
+target_include_directories(testutil PRIVATE BEFORE${Java_INCLUDE_DIRS})
+target_include_directories(testutil PRIVATE BEFORE${FOLLY_INCLUDE_DIRS})
+target_link_libraries(testutil hbaseclient-static ${CMAKE_THREAD_LIBS_INIT} ${Java_LIBRARIES} ${JNI_LIBRARIES} ${PROTOBUF_LIBRARY} ${Boost_LIBRARIES} ${GFLAGS_SHARED_LIB} ${GMOCK_SHARED_LIB} ${GTEST_BOTH_LIBRARIES} ${SASL_LIBS} ${GFLAGS_SHARED_LIB} ${KRB5_LIBRARIES} ${OPENSSL_LIBRARIES} ${Zookeeper_LIBRARIES})
+function(createTests testName)
+   message ("-- Including Test: ${testName}")
+    target_include_directories(${testName} PRIVATE BEFORE "include")
+    target_include_directories(${testName} PRIVATE BEFORE "${Java_INCLUDE_DIRS}")		
+    target_include_directories(${testName} PRIVATE BEFORE "${JNI_INCLUDE_DIRS}")	
+    target_include_directories(${testName} PRIVATE BEFORE "${Boost_INCLUDE_DIR}")	
+    target_include_directories(${testName} PRIVATE BEFORE "${GTEST_INCLUDE_DIRS}")	
+    target_include_directories(${testName} PRIVATE BEFORE "${OPENSSL_INCLUDE_DIR}")	
+
+    target_link_libraries(hbaseclient-static ${PROTOBUF_LIBRARY})
+    target_link_libraries(hbaseclient-static ${FOLLY_LIBRARIES})
+
+    target_link_libraries(${testName} hbaseclient-static testutil ${CMAKE_THREAD_LIBS_INIT} 
+    ${Java_LIBRARIES} 
+    ${JNI_LIBRARIES} 
+    ${PROTOBUF_LIBRARY}
+    ${Boost_LIBRARIES} 
+    ${GFLAGS_SHARED_LIB} 
+    ${GTEST_BOTH_LIBRARIES} 
+    ${SASL_LIBS} 
+    ${GFLAGS_SHARED_LIB} 
+    ${KRB5_LIBRARIES} 
+    ${Zookeeper_LIBRARIES} ${OPENSSL_LIBRARIES} 
+    ${WANGLE_LIBRARIES} 
+    ${FOLLY_LIBRARIES} 
+    ${GLOG_SHARED_LIB})
+endfunction()
+enable_testing(test)
+SET(TEST_DIR ${CMAKE_SOURCE_DIR}/src/test)
+GETSOURCEFILES(UNIT_TESTS "${TEST_DIR}")
+SET(UNIT_TEST_COUNT 0)
+FOREACH(testfile ${UNIT_TESTS})
+	get_filename_component(testfilename "${testfile}" NAME_WE)
+	add_executable("${testfilename}" "${TEST_DIR}/${testfile}")
+	createTests("${testfilename}")
+ 	MATH(EXPR UNIT_TEST_COUNT "${UNIT_TEST_COUNT}+1")
+	add_test(NAME "${testfilename}" COMMAND "${testfilename}" WORKING_DIRECTORY ${TEST_DIR})
+ENDFOREACH()
+message("-- Finished building ${UNIT_TEST_COUNT} unit test file(s)...")
diff --git a/hbase-native-client/cmake/FindFolly.cmake b/hbase-native-client/cmake/FindFolly.cmake
@@ -0,0 +1,48 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+#
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+find_path(FOLLY_ROOT_DIR
+    NAMES include/folly/AtomicHashMap.h
+)
+find_library(FOLLY_LIBRARIES
+    NAMES folly
+    HINTS ${FOLLY_ROOT_DIR}/lib /usr/lib/ /usr/local/lib/ /usr/lib/x86_64-linux-gnu/
+)
+find_library(FOLLY_BENCHMARK_LIBRARIES
+    NAMES follybenchmark
+    HINTS ${FOLLY_ROOT_DIR}/lib
+)
+find_path(FOLLY_INCLUDE_DIR
+    NAMES folly/AtomicHashMap.h
+    HINTS ${FOLLY_ROOT_DIR}/include
+)
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Folly DEFAULT_MSG
+    FOLLY_LIBRARIES
+    FOLLY_INCLUDE_DIR
+)
+mark_as_advanced(
+    FOLLY_ROOT_DIR
+    FOLLY_LIBRARIES
+    FOLLY_BENCHMARK_LIBRARIES
+    FOLLY_INCLUDE_DIR
+)
+if (FOLLY_LIBRARIES)
+  set(FOLLY_FOUND "true")
+  message("-- Folly found, ${FOLLY_LIBRARIES}")
+endif(FOLLY_LIBRARIES)
diff --git a/hbase-native-client/cmake/FindGMock.cmake b/hbase-native-client/cmake/FindGMock.cmake
@@ -0,0 +1,23 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+find_path(GMOCK_INCLUDE_DIR gmock/gmock.h)
+  # make sure we don't accidentally pick up a different version
+find_library(GMOCK_SHARED_LIB gmock)
+find_library(GMOCK_STATIC_LIB libgmock.a)
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(GMOCK REQUIRED_VARS
+  GMOCK_SHARED_LIB GMOCK_STATIC_LIB GMOCK_INCLUDE_DIR)
diff --git a/hbase-native-client/cmake/FindGflags.cmake b/hbase-native-client/cmake/FindGflags.cmake
@@ -0,0 +1,23 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+find_path(GFLAGS_INCLUDE_DIR gflags/gflags.h)
+  # make sure we don't accidentally pick up a different version
+find_library(GFLAGS_SHARED_LIB gflags)
+find_library(GFLAGS_STATIC_LIB libgflags.a)
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(GFLAGS REQUIRED_VARS
+  GFLAGS_SHARED_LIB GFLAGS_STATIC_LIB GFLAGS_INCLUDE_DIR)