Cleanup how compile flags are set and used by nGraph and external projects. (#2942)

* Cleanup how compile flags set and used by nGraph and external projects.
Set C++11 through CMake and pass it down to external projects.
Prefer CMake variables such as CMAKE_POSITION_INDEPENDENT_CODE and
CMAKE_CXX_STANDARD instead of explicitly setting compiler dependent
flags.
Create json compilation database for external projects.
CMAKE_CXX_FLAGS is used as common global options for nGraph and external
projects.
add_compile_options() is used for local options for current and sub
directories.
add_definitions() is used for setting definitions for current and sub
directories.
Note: Global options are not passed down to some external projects.
Note: mkl-dnn resets CMAKE_CXX_FLAGS internally.
Note: TBB and MLSL are not CMake based.
Noet: Eigen and json is header only library.

* Fix error.

* Fix error. (second attempt)

* Cleanup code.

* Allow check for undefined macro.

* Try to fix cldnn issue.

* Set type for CMake arguments.

* Pass C++ standard to protobuf.

* Pass C++ standard down to TBB.

* Change how Clang specific flags are handled.

* Fix error.

* Workaround for compile error on Baidu's PDPD docker.

* Fix windows build error.

CMakeLists.txt

@@ -114,17 +114,31 @@ if (APPLE)
     endif()
 endif()
 
+set(NGRAPH_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD ${NGRAPH_CXX_STANDARD})
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+# Create compilation database compile_commands.json
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
 # Setup CMAKE_ARGS to be forwarded to External Projects
-if (CMAKE_OSX_SYSROOT)
-    set(NGRAPH_FORWARD_CMAKE_ARGS
+set(NGRAPH_FORWARD_CMAKE_ARGS
     -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
     -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-        -DCMAKE_OSX_SYSROOT=${CMAKE_OSX_SYSROOT}
+    -DCMAKE_CXX_STANDARD:STRING=${CMAKE_CXX_STANDARD}
+    -DCMAKE_CXX_STANDARD_REQUIRED:BOOL=${CMAKE_CXX_STANDARD_REQUIRED}
+    -DCMAKE_CXX_EXTENSIONS:BOOL=${CMAKE_CXX_EXTENSIONS}
+    -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=${CMAKE_EXPORT_COMPILE_COMMANDS}
+    -DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=${CMAKE_POSITION_INDEPENDENT_CODE}
     )
-else()
+
+if (CMAKE_OSX_SYSROOT)
     set(NGRAPH_FORWARD_CMAKE_ARGS
-        -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-        -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+            ${NGRAPH_FORWARD_CMAKE_ARGS}
+            -DCMAKE_OSX_SYSROOT=${CMAKE_OSX_SYSROOT}
             )
 endif()
 
@@ -145,9 +159,6 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DEIGEN_MPL2_ONLY -DTBB_USE_THREADING_TO
 
 ngraph_var(NGRAPH_USE_PREBUILT_LLVM DEFAULT "FALSE")
 
-# Create compilation database compile_commands.json
-set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
-
 option(NGRAPH_UNIT_TEST_ENABLE "Control the building of unit tests" TRUE)
 option(NGRAPH_TOOLS_ENABLE "Control the building of tool" TRUE)
 option(NGRAPH_CPU_ENABLE "Control the building of the CPU backend" TRUE)
@@ -303,10 +314,8 @@ if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "^(Apple)?Clang$")
 endif()
 
 if (WIN32)
-    set (CMAKE_CXX_STANDARD 11)
     set(CMAKE_CXX_FLAGS "/W0 /EHsc /MP")
 else()
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
     set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-g")
     set(CMAKE_CXX_FLAGS_DEBUG  "-O0 -g")
     # These can be uncommented once we have visibility fully in place
@@ -418,6 +427,20 @@ if(NGRAPH_DEPRECATED_ENABLE)
     add_definitions(-DNGRAPH_DEPRECATED_ENABLE)
 endif()
 
+if(NGRAPH_JSON_ENABLE)
+    add_definitions(-DNGRAPH_JSON_ENABLE)
+endif()
+
+add_definitions(-DPROJECT_ROOT_DIR="${CMAKE_CURRENT_SOURCE_DIR}")
+
+#-----------------------------------------------------------------------------------------------
+# Print Global Options
+#-----------------------------------------------------------------------------------------------
+message(STATUS "Compile Flags: ${CMAKE_CXX_FLAGS}")
+message(STATUS "Shared Link Flags: ${CMAKE_SHARED_LINKER_FLAGS}")
+message(STATUS "CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE}")
+message(STATUS "CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG}")
+
 #-----------------------------------------------------------------------------------------------
 # External projects install directory
 #-----------------------------------------------------------------------------------------------
@@ -464,7 +487,6 @@ endif()
 
 include(cmake/external_gtest.cmake)
 if(NGRAPH_JSON_ENABLE)
-    add_definitions(-DNGRAPH_JSON_ENABLE)
     include(cmake/external_json.cmake)
 endif()
 if(NGRAPH_CPU_ENABLE OR NGRAPH_GENERIC_CPU_ENABLE)
@@ -512,22 +534,9 @@ if (NGRAPH_HALIDE)
     include(cmake/external_halide.cmake)
 endif()
 
-add_definitions(-DPROJECT_ROOT_DIR="${CMAKE_CURRENT_SOURCE_DIR}")
-
-message(STATUS "Compile Flags: ${CMAKE_CXX_FLAGS}")
-message(STATUS "Shared Link Flags: ${CMAKE_SHARED_LINKER_FLAGS}")
-message(STATUS "CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE}")
-message(STATUS "CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG}")
 add_subdirectory(src)
 
-if (NGRAPH_UNIT_TEST_ENABLE)
-    add_subdirectory(test)
-    message(STATUS "unit tests enabled")
-else()
-    add_subdirectory(test/models)
-    add_subdirectory(test/util)
-    message(STATUS "unit tests disabled")
-endif()
+add_subdirectory(test)
 
 if (NGRAPH_DOC_BUILD_ENABLE)
     add_subdirectory(doc)

cmake/clang_4_0_flags.cmake

@@ -14,42 +14,43 @@
 # limitations under the License.
 # ******************************************************************************
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=return-type")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=inconsistent-missing-override")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=comment")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic-errors")
+add_compile_options(-Werror=return-type)
+add_compile_options(-Werror=inconsistent-missing-override)
+add_compile_options(-Werror=comment)
+add_compile_options(-pedantic-errors)
 
- # whitelist errors here
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Weverything")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-gnu-zero-variadic-macro-arguments")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-c++98-compat-pedantic")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-weak-vtables")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-global-constructors")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-exit-time-destructors")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-missing-prototypes")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-missing-noreturn")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-switch")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-switch-enum")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-covered-switch-default")
+# whitelist errors here
+add_compile_options(-Weverything)
+add_compile_options(-Wno-gnu-zero-variadic-macro-arguments)
+add_compile_options(-Wno-c++98-compat-pedantic)
+add_compile_options(-Wno-weak-vtables)
+add_compile_options(-Wno-global-constructors)
+add_compile_options(-Wno-exit-time-destructors)
+add_compile_options(-Wno-missing-prototypes)
+add_compile_options(-Wno-missing-noreturn)
+add_compile_options(-Wno-switch)
+add_compile_options(-Wno-switch-enum)
+add_compile_options(-Wno-covered-switch-default)
+add_compile_options(-Wno-undef)
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
     if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 9.1.0)
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-zero-as-null-pointer-constant")
+        add_compile_options(-Wno-zero-as-null-pointer-constant)
     endif()
 endif()
 if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
     if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER "4.0.0")
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unused-lambda-capture")
+        add_compile_options(-Wno-unused-lambda-capture)
     endif()
 endif()
 
-# # should remove these
-# set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-old-style-cast")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-float-conversion")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-sign-conversion")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-padded")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-sign-compare")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unused-parameter")
+# should remove these
+# add_compile_options(-Wno-old-style-cast)
+add_compile_options(-Wno-float-conversion)
+add_compile_options(-Wno-sign-conversion)
+add_compile_options(-Wno-padded)
+add_compile_options(-Wno-sign-compare)
+add_compile_options(-Wno-unused-parameter)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-conversion")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-double-promotion")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-undefined-func-template")
+add_compile_options(-Wno-conversion)
+add_compile_options(-Wno-double-promotion)
+add_compile_options(-Wno-undefined-func-template)

cmake/external_cldnn.cmake

@@ -26,15 +26,6 @@ set(CLDNN_GIT_LABEL a05c9f29c5690a4beb9cd8c9f712cfb4399b2a6d)
 set(BOOST_VERSION 1.64.0)
 set(OUT_DIR ${EXTERNAL_PROJECTS_ROOT}/cldnn/out)
 
-if(NOT WIN32)
-    set(COMPILE_FLAGS -fPIC)
-endif()
-if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-    if (DEFINED NGRAPH_USE_CXX_ABI)
-        set(COMPILE_FLAGS "${COMPILE_FLAGS} -D_GLIBCXX_USE_CXX11_ABI=${NGRAPH_USE_CXX_ABI}")
-    endif()
-endif()
-
 ExternalProject_Add(
     ext_cldnn
     PREFIX cldnn
@@ -48,10 +39,12 @@ ExternalProject_Add(
     CMAKE_GENERATOR_TOOLSET ${CMAKE_GENERATOR_TOOLSET}
     CMAKE_ARGS
                 ${NGRAPH_FORWARD_CMAKE_ARGS}
+                -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
                 # -DCLDNN__OUTPUT_DIR=out/Debug
                 -DCLDNN__BOOST_VERSION=${BOOST_VERSION}
-                -DCLDNN__INCLUDE_TESTS=FALSE
-                -DCLDNN__INCLUDE_TUTORIAL=FALSE
+                -DCLDNN__INCLUDE_TESTS=OFF
+                -DCLDNN__INCLUDE_CORE_INTERNAL_TESTS=OFF
+                -DCLDNN__INCLUDE_TUTORIAL=OFF
     EXCLUDE_FROM_ALL TRUE
     )
 

cmake/external_gtest.cmake

@@ -24,22 +24,9 @@ include(ExternalProject)
 SET(GTEST_GIT_REPO_URL https://github.com/google/googletest.git)
 SET(GTEST_GIT_LABEL release-1.8.1)
 
-if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-    if (DEFINED NGRAPH_USE_CXX_ABI)
-        set(COMPILE_FLAGS "${COMPILE_FLAGS} -D_GLIBCXX_USE_CXX11_ABI=${NGRAPH_USE_CXX_ABI}")
-    endif()
-endif()
-
 set(GMOCK_OUTPUT_DIR ${EXTERNAL_PROJECTS_ROOT}/gtest/build/googlemock)
 set(GTEST_OUTPUT_DIR ${GMOCK_OUTPUT_DIR}/gtest)
 
-if (APPLE OR LINUX)
-    set(COMPILE_FLAGS -fPIC)
-endif()
-
-set(GTEST_CMAKE_ARGS
-    -DCMAKE_CXX_FLAGS=${COMPILE_FLAGS}
-)
 if(WIN32)
     list(APPEND GTEST_CMAKE_ARGS
         -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE=${GTEST_OUTPUT_DIR}
@@ -48,6 +35,14 @@ if(WIN32)
     )
 endif()
 
+if(LINUX)
+    # workaround for compile error
+    # related: https://github.com/intel/mkl-dnn/issues/55
+    set(GTEST_CXX_FLAGS -Wno-unused-result ${CMAKE_CXX_FLAGS})
+else()
+    set(GTEST_CXX_FLAGS ${CMAKE_CXX_FLAGS})
+endif()
+
 ExternalProject_Add(
     ext_gtest
     PREFIX gtest
@@ -61,6 +56,7 @@ ExternalProject_Add(
     CMAKE_GENERATOR_TOOLSET ${CMAKE_GENERATOR_TOOLSET}
     CMAKE_ARGS
         ${NGRAPH_FORWARD_CMAKE_ARGS}
+        -DCMAKE_CXX_FLAGS=${GTEST_CXX_FLAGS}
         ${GTEST_CMAKE_ARGS}
     BINARY_DIR "${EXTERNAL_PROJECTS_ROOT}/gtest/build"
     EXCLUDE_FROM_ALL TRUE

cmake/external_halide.cmake

@@ -52,6 +52,7 @@ ExternalProject_Add(
     CMAKE_GENERATOR_TOOLSET ${CMAKE_GENERATOR_TOOLSET}
     CMAKE_ARGS
     ${NGRAPH_FORWARD_CMAKE_ARGS}
+    -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
     -DLLVM_DIR=${HALIDE_LLVM_DIR}
     -DCMAKE_INSTALL_PREFIX=${EXTERNAL_PROJECTS_ROOT}/halide
     -DHALIDE_SHARED_LIBRARY=OFF

cmake/external_llvm.cmake

@@ -18,12 +18,6 @@ include(ExternalProject)
 
 set(NGRAPH_LLVM_VERSION 8.0.0)
 
-if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-    if (DEFINED NGRAPH_USE_CXX_ABI)
-        set(COMPILE_FLAGS "-D_GLIBCXX_USE_CXX11_ABI=${NGRAPH_USE_CXX_ABI}")
-    endif()
-endif()
-
 ExternalProject_Add(
     ext_clang
     PREFIX clang
@@ -77,8 +71,8 @@ ExternalProject_Add(
     CMAKE_GENERATOR_PLATFORM ${CMAKE_GENERATOR_PLATFORM}
     CMAKE_GENERATOR_TOOLSET ${CMAKE_GENERATOR_TOOLSET}
     CMAKE_ARGS ${NGRAPH_FORWARD_CMAKE_ARGS}
+                -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
                 -DCMAKE_ASM_COMPILER=${LLVM_CMAKE_ASM_COMPILER}
-                -DCMAKE_CXX_FLAGS=${COMPILE_FLAGS}
                 -DCMAKE_INSTALL_PREFIX=${EXTERNAL_PROJECTS_ROOT}/llvm
                 -DLLVM_INCLUDE_DOCS=OFF
                 -DLLVM_INCLUDE_TESTS=OFF

cmake/external_onnx.cmake

@@ -41,6 +41,7 @@ ExternalProject_Add(
     CMAKE_GENERATOR_PLATFORM ${CMAKE_GENERATOR_PLATFORM}
     CMAKE_GENERATOR_TOOLSET ${CMAKE_GENERATOR_TOOLSET}
     CMAKE_ARGS ${NGRAPH_FORWARD_CMAKE_ARGS}
+               -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
                -DONNX_GEN_PB_TYPE_STUBS=OFF
                -DCMAKE_PREFIX_PATH=${Protobuf_INSTALL_PREFIX}
                -DONNX_ML=TRUE

cmake/external_protobuf.cmake

@@ -38,6 +38,7 @@ if (WIN32)
         CMAKE_GENERATOR_TOOLSET ${CMAKE_GENERATOR_TOOLSET}
         CMAKE_ARGS
             ${NGRAPH_FORWARD_CMAKE_ARGS}
+            -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
             -Dprotobuf_MSVC_STATIC_RUNTIME=OFF
             -Dprotobuf_WITH_ZLIB=OFF
             -Dprotobuf_BUILD_TESTS=OFF
@@ -60,7 +61,8 @@ elseif (APPLE)
         GIT_TAG ${NGRAPH_PROTOBUF_GIT_TAG}
         UPDATE_COMMAND ""
         PATCH_COMMAND ""
-        CONFIGURE_COMMAND ./autogen.sh COMMAND ./configure --prefix=${EXTERNAL_PROJECTS_ROOT}/protobuf --disable-shared CXXFLAGS=-fPIC
+        CONFIGURE_COMMAND ./autogen.sh COMMAND ./configure --prefix=${EXTERNAL_PROJECTS_ROOT}/protobuf --disable-shared
+        BUILD_COMMAND $(MAKE) "CXXFLAGS=-std=c++${NGRAPH_CXX_STANDARD} -fPIC"
         TMP_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/tmp"
         STAMP_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/stamp"
         DOWNLOAD_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/download"
@@ -77,7 +79,8 @@ else()
         GIT_TAG ${NGRAPH_PROTOBUF_GIT_TAG}
         UPDATE_COMMAND ""
         PATCH_COMMAND ""
-        CONFIGURE_COMMAND ./autogen.sh COMMAND ./configure --prefix=${EXTERNAL_PROJECTS_ROOT}/protobuf --disable-shared CXX=${CMAKE_CXX_COMPILER} CXXFLAGS=-fPIC
+        CONFIGURE_COMMAND ./autogen.sh COMMAND ./configure --prefix=${EXTERNAL_PROJECTS_ROOT}/protobuf --disable-shared CXX=${CMAKE_CXX_COMPILER}
+        BUILD_COMMAND $(MAKE) "CXXFLAGS=-std=c++${NGRAPH_CXX_STANDARD} -fPIC"
         TMP_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/tmp"
         STAMP_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/stamp"
         DOWNLOAD_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/download"

cmake/external_tbb.cmake

@@ -32,7 +32,7 @@ if(NGRAPH_TBB_ENABLE)
 
     include(${TBB_ROOT}/cmake/TBBBuild.cmake)
     tbb_build(TBB_ROOT ${TBB_ROOT} MAKE_ARGS tbb_build_dir=${CMAKE_CURRENT_BINARY_DIR}/tbb_build
-                tbb_build_prefix=tbb CONFIG_DIR TBB_DIR)
+        tbb_build_prefix=tbb stdver=c++${NGRAPH_CXX_STANDARD} CONFIG_DIR TBB_DIR)
     find_package(TBB REQUIRED tbb)
     if (NOT TBB_FOUND)
         message(FATAL_ERROR "TBB is needed by the CPU backend and was not found")

cmake/sdl.cmake

@@ -23,7 +23,7 @@ endif()
 set(SDL_cmake_included true)
 
 if(UNIX)
-    set(SDL_CXX_FLAGS "-O2 -fPIC -Wformat -Wformat-security")
+    set(SDL_CXX_FLAGS "-O2 -Wformat -Wformat-security")
     set(SDL_CXX_FLAGS "${SDL_CXX_FLAGS} -D_FORTIFY_SOURCE=2")
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_FORTIFY_SOURCE=2")
     if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")

src/CMakeLists.txt

@@ -14,7 +14,7 @@
 # limitations under the License.
 # ******************************************************************************
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DIN_NGRAPH_LIBRARY")
+add_definitions(-DIN_NGRAPH_LIBRARY)
 
 include_directories(ngraph)
 

src/ngraph/CMakeLists.txt

@@ -525,7 +525,7 @@ endif()
 
 if(NGRAPH_ADDRESS_SANITIZER)
     message(STATUS "Enable Address Sanitizer")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -fsanitize=address -fno-omit-frame-pointer")
+    add_compile_options(-g -fsanitize=address -fno-omit-frame-pointer)
 endif()
 
 add_subdirectory(codegen)

src/ngraph/runtime/generic_cpu/CMakeLists.txt

@@ -17,8 +17,7 @@
 if (NGRAPH_GENERIC_CPU_ENABLE)
     find_package(OpenMP)
     if (OPENMP_FOUND)
-        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
+        add_compile_options(${OpenMP_CXX_FLAGS})
     endif()
     add_library(gcpu_backend SHARED gcpu_backend.cpp gcpu_executable.cpp node_wrapper.cpp)
     if(NGRAPH_LIB_VERSIONING_ENABLE)
@@ -27,7 +26,6 @@ if (NGRAPH_GENERIC_CPU_ENABLE)
             SOVERSION ${NGRAPH_API_VERSION})
     endif()
     target_link_libraries(gcpu_backend PRIVATE ngraph libeigen)
-    target_compile_options(gcpu_backend PUBLIC -fopenmp)
 
     install(TARGETS gcpu_backend
         LIBRARY DESTINATION "${NGRAPH_INSTALL_LIB}"

src/ngraph/runtime/gpu/nvcc/example.cu.cpp

@@ -14,7 +14,7 @@
 // limitations under the License.
 //*****************************************************************************
 
-#include <iostream>
+#include <cstdio>
 #include "ngraph/runtime/gpu/nvcc/kernels.hpp"
 using namespace ngraph;
 

test/CMakeLists.txt

@@ -14,6 +14,16 @@
 # limitations under the License.
 # ******************************************************************************
 
+add_definitions("-DSERIALIZED_ZOO=\"${CMAKE_CURRENT_SOURCE_DIR}/models\"")
+
+if(NOT NGRAPH_UNIT_TEST_ENABLE)
+    message(STATUS "unit tests disabled")
+    add_subdirectory(util)
+    return()
+endif()
+
+message(STATUS "unit tests enabled")
+
 if(LINUX)
     set(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
 endif()
@@ -22,7 +32,7 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
     if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER "4.0.0")
         # gtest has issues with this with v1.8.x
         # gtest issue is supposed to be addressed after v1.8.x
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-zero-as-null-pointer-constant")
+        add_compile_options(-Wno-zero-as-null-pointer-constant)
     endif()
 endif()
 
@@ -127,8 +137,7 @@ if (NGRAPH_GENERIC_CPU_ENABLE)
     set(ACTIVE_BACKEND_LIST ${ACTIVE_BACKEND_LIST} GCPU)
 endif()
 
-add_subdirectory(models)
-add_subdirectory(files)
+add_definitions("-DTEST_FILES=\"${CMAKE_CURRENT_SOURCE_DIR}/files\"")
 add_subdirectory(util)
 
 # backend specific test files must meet the following requirements:
@@ -212,12 +221,11 @@ add_executable(unit-test ${SRC})
 
 target_include_directories(unit-test PRIVATE ".")
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DCURDIR=\\\"${CMAKE_CURRENT_SOURCE_DIR}\\\"")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DJSON_INCLUDES=\\\"${JSON_INCLUDE_DIR}\\\"")
+add_definitions("-DCURDIR=\"${CMAKE_CURRENT_SOURCE_DIR}\"")
+add_definitions("-DJSON_INCLUDES=\"${JSON_INCLUDE_DIR}\"")
 
 if(NGRAPH_ADDRESS_SANITIZER)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -fsanitize=address -fno-omit-frame-pointer")
+    add_compile_options(-g -fsanitize=address -fno-omit-frame-pointer)
 endif()
 
 target_link_libraries(unit-test PRIVATE ngraph_test_util)

test/files/CMakeLists.txt

-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DTEST_FILES=\\\"${CMAKE_CURRENT_SOURCE_DIR}\\\"" PARENT_SCOPE)

test/models/CMakeLists.txt

-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DSERIALIZED_ZOO=\\\"${CMAKE_CURRENT_SOURCE_DIR}\\\"" PARENT_SCOPE)