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Turn On -DLIBCXX_ENABLE_BENCHMARKS by default.
This patch enables the `cxx-benchmarks` target by default. Note that the target still has to be manually invoked since it isn't included in the default 'make' rule. This patch also gets the benchmarks building w/ GCC. The build previously required the '-stdlib=libc++' flag but upstream patches to Google Benchmark now allow the library to build w/ libc++ and GCC. These changes should make the benchmarks easier to build and test. llvm-svn: 279999
This commit is contained in:
Eric Fiselier
parent
354832e585
commit
8b4a30584a
@ -57,7 +57,7 @@ option(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY "Build libc++experimental.a" ON)
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option(LIBCXX_ENABLE_FILESYSTEM
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"Build filesystem as part of libc++experimental.a" ${LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY})
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option(LIBCXX_INCLUDE_TESTS "Build the libc++ tests." ${LLVM_INCLUDE_TESTS})
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option(LIBCXX_INCLUDE_BENCHMARKS "Build the libc++ benchmarks and their dependancies" OFF)
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option(LIBCXX_INCLUDE_BENCHMARKS "Build the libc++ benchmarks and their dependancies" ON)
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option(LIBCXX_BUILD_BENCHMARK_NATIVE_STDLIB "Build the benchmarks against the native STL" OFF)
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option(LIBCXX_INCLUDE_DOCS "Build the libc++ documentation." ${LLVM_INCLUDE_DOCS})
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set(LIBCXX_LIBDIR_SUFFIX "${LLVM_LIBDIR_SUFFIX}" CACHE STRING
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@ -4,21 +4,20 @@ include(CheckCXXCompilerFlag)
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#==============================================================================
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# Build Google Benchmark for libc++
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#==============================================================================
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check_cxx_compiler_flag(-stdlib=libc++ LIBCXX_HAS_NO_STDLIB_LIBCXX_FLAG)
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if (NOT LIBCXX_HAS_NO_STDLIB_LIBCXX_FLAG)
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message(FATAL "Benchmark requires support for the -stdlib=libc++ flag")
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endif()
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set(BENCHMARK_LIBCXX_COMPILE_FLAGS
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-Wno-unused-command-line-argument
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-nostdinc++
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-cxx-isystem ${LIBCXX_SOURCE_DIR}/include
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-stdlib=libc++)
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set(BENCHMARK_LIBCXX_LINK_FLAGS
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-isystem ${LIBCXX_SOURCE_DIR}/include
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-L${LIBCXX_LIBRARY_DIR}
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-Wl,-rpath,${LIBCXX_LIBRARY_DIR})
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-Wl,-rpath,${LIBCXX_LIBRARY_DIR}
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)
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if (DEFINED LIBCXX_CXX_ABI_LIBRARY_PATH)
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list(APPEND BENCHMARK_LIBCXX_COMPILE_FLAGS
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-L${LIBCXX_CXX_ABI_LIBRARY_PATH}
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-Wl,-rpath,${LIBCXX_CXX_ABI_LIBRARY_PATH})
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endif()
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split_list(BENCHMARK_LIBCXX_COMPILE_FLAGS)
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split_list(BENCHMARK_LIBCXX_LINK_FLAGS)
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ExternalProject_Add(google-benchmark-libcxx
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EXCLUDE_FROM_ALL ON
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@ -32,8 +31,7 @@ ExternalProject_Add(google-benchmark-libcxx
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-DCMAKE_BUILD_TYPE:STRING=RELEASE
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-DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
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-DCMAKE_CXX_FLAGS:STRING=${BENCHMARK_LIBCXX_COMPILE_FLAGS}
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-DCMAKE_SHARED_LINK_FLAGS:STRING=${BENCHMARK_LIBCXX_LINK_FLAGS}
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-DCMAKE_EXE_LINK_FLAGS:STRING=${BENCHMARK_LIBCXX_LINK_FLAGS}
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-DBENCHMARK_USE_LIBCXX:BOOL=ON
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-DBENCHMARK_ENABLE_TESTING:BOOL=OFF)
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#==============================================================================
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@ -45,19 +43,18 @@ if (LIBCXX_BUILD_BENCHMARK_NATIVE_STDLIB)
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PREFIX benchmark-native
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SOURCE_DIR ${LIBCXX_SOURCE_DIR}/utils/google-benchmark
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INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/benchmark-native
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CMAKE_CACHE_ARGS
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-DBENCHMARK_ENABLE_TESTING:BOOL=OFF
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CMAKE_CACHE_ARGS
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-DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
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-DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
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-DCMAKE_BUILD_TYPE:STRING=RELEASE
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-DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>)
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-DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
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-DBENCHMARK_ENABLE_TESTING:BOOL=OFF)
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endif()
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#==============================================================================
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# Benchmark tests configuration
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#==============================================================================
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add_custom_target(libcxx-benchmarks)
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add_custom_target(cxx-benchmarks)
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set(BENCHMARK_LIBCXX_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/benchmark-libcxx)
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set(BENCHMARK_NATIVE_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/benchmark-native)
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@ -67,7 +64,7 @@ set(BENCHMARK_TEST_COMPILE_FLAGS
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)
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set(BENCHMARK_TEST_LIBCXX_COMPILE_FLAGS
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-nostdinc++
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-cxx-isystem ${LIBCXX_SOURCE_DIR}/include
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-isystem ${LIBCXX_SOURCE_DIR}/include
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${BENCHMARK_TEST_COMPILE_FLAGS}
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-Wno-user-defined-literals
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)
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@ -86,7 +83,7 @@ macro(add_benchmark_test name source_file)
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set(libcxx_target ${name}_libcxx)
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add_executable(${libcxx_target} EXCLUDE_FROM_ALL ${source_file})
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add_dependencies(${libcxx_target} cxx google-benchmark-libcxx)
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add_dependencies(libcxx-benchmarks ${libcxx_target})
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add_dependencies(cxx-benchmarks ${libcxx_target})
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if (LIBCXX_ENABLE_SHARED)
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target_link_libraries(${libcxx_target} cxx_shared)
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else()
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@ -106,7 +103,7 @@ macro(add_benchmark_test name source_file)
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if (LIBCXX_HAS_PTHREAD_LIB)
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target_link_libraries(${native_target} -pthread)
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endif()
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add_dependencies(libcxx-benchmarks ${native_target})
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add_dependencies(cxx-benchmarks ${native_target})
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set_target_properties(${native_target}
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PROPERTIES
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OUTPUT_NAME "${name}.native.out"
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@ -123,7 +120,7 @@ endmacro()
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file(GLOB BENCHMARK_TESTS "*.bench.cpp")
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foreach(test_path ${BENCHMARK_TESTS})
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get_filename_component(test_file "${test_path}" NAME)
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message(STATUS "TEST: ${test_file}")
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message(STATUS "-- Adding Benchmark: ${test_file}")
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string(REPLACE ".bench.cpp" "" test_name "${test_file}")
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add_benchmark_test(${test_name} ${test_file})
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endforeach()
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@ -251,7 +251,7 @@ libc++ Feature Options
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.. option:: LIBCXX_INCLUDE_BENCHMARKS:BOOL
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**Default**: ``OFF``
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**Default**: ``ON``
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Build the libc++ benchmark tests and the Google Benchmark library needed
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to support them.
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@ -214,17 +214,16 @@ For more information about using the Google Benchmark library see the
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Building Benchmarks
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-------------------
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The benchmark tests are not enabled by default. To build the benchmarks
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libc++ must be configured using the CMake option ``-DLIBCXX_INCLUDE_BENCHMARKS=ON``.
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Then the benchmarks can be built using the ``libcxx-benchmarks`` target.
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The benchmark tests are not built by default. The benchmarks can be built using
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the ``cxx-benchmarks`` target.
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An example build would look like:
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.. code-block:: bash
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$ cd build
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$ cmake [options] -DLIBCXX_INCLUDE_BENCHMARKS=ON <path to libcxx sources>
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$ make libcxx-benchmarks
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$ cmake [options] <path to libcxx sources>
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$ make cxx-benchmarks
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This will build all of the benchmarks under ``<libcxx-src>/benchmarks`` to be
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built against the just-built libc++. The compiled tests are output into
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@ -252,7 +251,7 @@ For example:
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.. code-block:: bash
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$ cd build/benchmarks
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$ make libcxx-benchmarks
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$ make cxx-benchmarks
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$ ./algorithms.libcxx.out # Runs all the benchmarks
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$ ./algorithms.libcxx.out --benchmark_filter=BM_Sort.* # Only runs the sort benchmarks
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