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include(ExternalProject)
include(CheckCXXCompilerFlag)
#==============================================================================
# Build Google Benchmark for libc++
#==============================================================================
check_cxx_compiler_flag(-stdlib=libc++ LIBCXX_HAS_NO_STDLIB_LIBCXX_FLAG)
if (NOT LIBCXX_HAS_NO_STDLIB_LIBCXX_FLAG)
message(FATAL "Benchmark requires support for the -stdlib=libc++ flag")
endif()
set(BENCHMARK_LIBCXX_COMPILE_FLAGS
-Wno-unused-command-line-argument
-nostdinc++
-cxx-isystem ${LIBCXX_SOURCE_DIR}/include
-stdlib=libc++)
set(BENCHMARK_LIBCXX_LINK_FLAGS
-L${LIBCXX_LIBRARY_DIR}
-Wl,-rpath,${LIBCXX_LIBRARY_DIR})
split_list(BENCHMARK_LIBCXX_COMPILE_FLAGS)
split_list(BENCHMARK_LIBCXX_LINK_FLAGS)
ExternalProject_Add(google-benchmark-libcxx
EXCLUDE_FROM_ALL ON
DEPENDS cxx
PREFIX benchmark-libcxx
SOURCE_DIR ${LIBCXX_SOURCE_DIR}/utils/google-benchmark
INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/benchmark-libcxx
CMAKE_CACHE_ARGS
-DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
-DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
-DCMAKE_BUILD_TYPE:STRING=RELEASE
-DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
-DCMAKE_CXX_FLAGS:STRING=${BENCHMARK_LIBCXX_COMPILE_FLAGS}
-DCMAKE_SHARED_LINK_FLAGS:STRING=${BENCHMARK_LIBCXX_LINK_FLAGS}
-DCMAKE_EXE_LINK_FLAGS:STRING=${BENCHMARK_LIBCXX_LINK_FLAGS}
-DBENCHMARK_ENABLE_TESTING:BOOL=OFF)
#==============================================================================
# Build Google Benchmark for the native stdlib
#==============================================================================
if (LIBCXX_BUILD_BENCHMARK_NATIVE_STDLIB)
ExternalProject_Add(google-benchmark-native
EXCLUDE_FROM_ALL ON
PREFIX benchmark-native
SOURCE_DIR ${LIBCXX_SOURCE_DIR}/utils/google-benchmark
INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/benchmark-native
CMAKE_CACHE_ARGS
-DBENCHMARK_ENABLE_TESTING:BOOL=OFF
CMAKE_CACHE_ARGS
-DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
-DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
-DCMAKE_BUILD_TYPE:STRING=RELEASE
-DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>)
endif()
#==============================================================================
# Benchmark tests configuration
#==============================================================================
add_custom_target(libcxx-benchmarks)
set(BENCHMARK_LIBCXX_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/benchmark-libcxx)
set(BENCHMARK_NATIVE_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/benchmark-native)
set(BENCHMARK_TEST_COMPILE_FLAGS
-std=c++14 -O2
-I${BENCHMARK_LIBCXX_INSTALL}/include
)
set(BENCHMARK_TEST_LIBCXX_COMPILE_FLAGS
-nostdinc++
-cxx-isystem ${LIBCXX_SOURCE_DIR}/include
${BENCHMARK_TEST_COMPILE_FLAGS}
-Wno-user-defined-literals
)
set(BENCHMARK_TEST_LIBCXX_LINK_FLAGS
-nodefaultlibs
-L${BENCHMARK_LIBCXX_INSTALL}/lib/
)
set(BENCHMARK_TEST_NATIVE_LINK_FLAGS
-L${BENCHMARK_NATIVE_INSTALL}/lib/
)
split_list(BENCHMARK_TEST_COMPILE_FLAGS)
split_list(BENCHMARK_TEST_LIBCXX_COMPILE_FLAGS)
split_list(BENCHMARK_TEST_LIBCXX_LINK_FLAGS)
split_list(BENCHMARK_TEST_NATIVE_LINK_FLAGS)
macro(add_benchmark_test name source_file)
set(libcxx_target ${name}_libcxx)
add_executable(${libcxx_target} EXCLUDE_FROM_ALL ${source_file})
add_dependencies(${libcxx_target} cxx google-benchmark-libcxx)
add_dependencies(libcxx-benchmarks ${libcxx_target})
if (LIBCXX_ENABLE_SHARED)
target_link_libraries(${libcxx_target} cxx_shared)
else()
target_link_libraries(${libcxx_target} cxx_static)
endif()
target_link_libraries(${libcxx_target} -lbenchmark)
set_target_properties(${libcxx_target}
PROPERTIES
OUTPUT_NAME "${name}.libcxx.out"
COMPILE_FLAGS "${BENCHMARK_TEST_LIBCXX_COMPILE_FLAGS}"
LINK_FLAGS "${BENCHMARK_TEST_LIBCXX_LINK_FLAGS}")
if (LIBCXX_BUILD_BENCHMARK_NATIVE_STDLIB)
set(native_target ${name}_native)
add_executable(${native_target} EXCLUDE_FROM_ALL ${source_file})
add_dependencies(${native_target} google-benchmark-native)
target_link_libraries(${native_target} -lbenchmark)
if (LIBCXX_HAS_PTHREAD_LIB)
target_link_libraries(${native_target} -pthread)
endif()
add_dependencies(libcxx-benchmarks ${native_target})
set_target_properties(${native_target}
PROPERTIES
OUTPUT_NAME "${name}.native.out"
INCLUDE_DIRECTORIES ""
COMPILE_FLAGS "${BENCHMARK_TEST_COMPILE_FLAGS}"
LINK_FLAGS "${BENCHMARK_TEST_NATIVE_LINK_FLAGS}")
endif()
endmacro()
#==============================================================================
# Register Benchmark tests
#==============================================================================
file(GLOB BENCHMARK_TESTS "*.bench.cpp")
foreach(test_path ${BENCHMARK_TESTS})
get_filename_component(test_file "${test_path}" NAME)
message(STATUS "TEST: ${test_file}")
string(REPLACE ".bench.cpp" "" test_name "${test_file}")
add_benchmark_test(${test_name} ${test_file})
endforeach()
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