1include(ExternalProject)
2include(CheckCXXCompilerFlag)
3
4#==============================================================================
5# Build Google Benchmark for libc++
6#==============================================================================
7
8set(BENCHMARK_LIBCXX_COMPILE_FLAGS
9    -Wno-unused-command-line-argument
10    -nostdinc++
11    -isystem ${LIBCXX_SOURCE_DIR}/include
12    -L${LIBCXX_LIBRARY_DIR}
13    -Wl,-rpath,${LIBCXX_LIBRARY_DIR}
14    ${SANITIZER_FLAGS}
15    )
16if (DEFINED LIBCXX_CXX_ABI_LIBRARY_PATH)
17  list(APPEND BENCHMARK_LIBCXX_COMPILE_FLAGS
18          -L${LIBCXX_CXX_ABI_LIBRARY_PATH}
19          -Wl,-rpath,${LIBCXX_CXX_ABI_LIBRARY_PATH})
20endif()
21list(APPEND BENCHMARK_LIBCXX_COMPILE_FLAGS -include "${LIBCXX_BINARY_DIR}/__config_site")
22split_list(BENCHMARK_LIBCXX_COMPILE_FLAGS)
23
24ExternalProject_Add(google-benchmark-libcxx
25        EXCLUDE_FROM_ALL ON
26        DEPENDS cxx cxx-headers
27        PREFIX benchmark-libcxx
28        SOURCE_DIR ${LIBCXX_SOURCE_DIR}/utils/google-benchmark
29        INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/benchmark-libcxx
30        CMAKE_CACHE_ARGS
31          -DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
32          -DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
33          -DCMAKE_BUILD_TYPE:STRING=RELEASE
34          -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
35          -DCMAKE_CXX_FLAGS:STRING=${BENCHMARK_LIBCXX_COMPILE_FLAGS}
36          -DBENCHMARK_USE_LIBCXX:BOOL=ON
37          -DBENCHMARK_ENABLE_TESTING:BOOL=OFF)
38
39#==============================================================================
40# Build Google Benchmark for the native stdlib
41#==============================================================================
42set(BENCHMARK_NATIVE_TARGET_FLAGS)
43if (LIBCXX_BENCHMARK_NATIVE_GCC_TOOLCHAIN)
44  set(BENCHMARK_NATIVE_TARGET_FLAGS
45      -gcc-toolchain ${LIBCXX_BENCHMARK_NATIVE_GCC_TOOLCHAIN})
46endif()
47split_list(BENCHMARK_NATIVE_TARGET_FLAGS)
48
49if (LIBCXX_BENCHMARK_NATIVE_STDLIB)
50  ExternalProject_Add(google-benchmark-native
51        EXCLUDE_FROM_ALL ON
52        PREFIX benchmark-native
53        SOURCE_DIR ${LIBCXX_SOURCE_DIR}/utils/google-benchmark
54        INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/benchmark-native
55        CMAKE_CACHE_ARGS
56          -DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
57          -DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
58          -DCMAKE_CXX_FLAGS:STRING=${BENCHMARK_NATIVE_TARGET_FLAGS}
59          -DCMAKE_BUILD_TYPE:STRING=RELEASE
60          -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
61          -DBENCHMARK_ENABLE_TESTING:BOOL=OFF)
62endif()
63
64
65#==============================================================================
66# Benchmark tests configuration
67#==============================================================================
68add_custom_target(cxx-benchmarks)
69set(BENCHMARK_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR})
70set(BENCHMARK_LIBCXX_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/benchmark-libcxx)
71set(BENCHMARK_NATIVE_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/benchmark-native)
72
73
74set(BENCHMARK_TEST_COMPILE_FLAGS
75    -O2
76    -fsized-deallocation
77    -I${BENCHMARK_LIBCXX_INSTALL}/include
78    -I${LIBCXX_SOURCE_DIR}/test/support
79)
80set(BENCHMARK_TEST_LIBCXX_COMPILE_FLAGS
81    ${BENCHMARK_TEST_COMPILE_FLAGS}
82    ${SANITIZER_FLAGS}
83    -Wno-user-defined-literals
84    -Wno-suggest-override
85)
86
87set(BENCHMARK_TEST_LIBCXX_LINK_FLAGS
88    -nodefaultlibs
89    -L${BENCHMARK_LIBCXX_INSTALL}/lib/
90    ${SANITIZER_FLAGS}
91)
92set(BENCHMARK_TEST_NATIVE_COMPILE_FLAGS
93  ${BENCHMARK_NATIVE_TARGET_FLAGS}
94  ${BENCHMARK_TEST_COMPILE_FLAGS}
95)
96set(BENCHMARK_TEST_NATIVE_LINK_FLAGS
97    ${BENCHMARK_NATIVE_TARGET_FLAGS}
98    -L${BENCHMARK_NATIVE_INSTALL}/lib
99)
100split_list(BENCHMARK_TEST_COMPILE_FLAGS)
101split_list(BENCHMARK_TEST_LIBCXX_COMPILE_FLAGS)
102split_list(BENCHMARK_TEST_LIBCXX_LINK_FLAGS)
103split_list(BENCHMARK_TEST_NATIVE_COMPILE_FLAGS)
104split_list(BENCHMARK_TEST_NATIVE_LINK_FLAGS)
105
106if (LIBCXX_BENCHMARK_NATIVE_STDLIB STREQUAL "libstdc++")
107  find_library(LIBSTDCXX_FILESYSTEM_TEST stdc++fs
108        PATHS ${LIBCXX_BENCHMARK_NATIVE_GCC_TOOLCHAIN}
109        PATH_SUFFIXES lib lib64
110        DOC "The libstdc++ filesystem library used by the benchmarks"
111    )
112    if (NOT "${LIBSTDCXX_FILESYSTEM_TEST}" STREQUAL "LIBSTDCXX_FILESYSTEM_TEST-NOTFOUND")
113      set(LIBSTDCXX_FILESYSTEM_LIB "stdc++fs")
114    endif()
115endif()
116
117set(libcxx_benchmark_targets)
118
119function(add_benchmark_test name source_file)
120  set(libcxx_target ${name}_libcxx)
121  list(APPEND libcxx_benchmark_targets ${libcxx_target})
122  add_executable(${libcxx_target} EXCLUDE_FROM_ALL ${source_file})
123  add_dependencies(${libcxx_target} cxx google-benchmark-libcxx)
124  add_dependencies(cxx-benchmarks ${libcxx_target})
125  if (LIBCXX_ENABLE_SHARED)
126    target_link_libraries(${libcxx_target} PRIVATE cxx_shared)
127  else()
128    target_link_libraries(${libcxx_target} PRIVATE cxx_static)
129  endif()
130  if (TARGET cxx_experimental)
131    target_link_libraries(${libcxx_target} PRIVATE cxx_experimental)
132  endif()
133  target_link_libraries(${libcxx_target} PRIVATE -lbenchmark)
134  if (LLVM_USE_SANITIZER)
135    target_link_libraries(${libcxx_target} PRIVATE -ldl)
136  endif()
137  set_target_properties(${libcxx_target}
138    PROPERTIES
139          OUTPUT_NAME "${name}.libcxx.out"
140          RUNTIME_OUTPUT_DIRECTORY "${BENCHMARK_OUTPUT_DIR}"
141          COMPILE_FLAGS "${BENCHMARK_TEST_LIBCXX_COMPILE_FLAGS}"
142          LINK_FLAGS "${BENCHMARK_TEST_LIBCXX_LINK_FLAGS}"
143          CXX_STANDARD 17
144          CXX_STANDARD_REQUIRED YES
145          CXX_EXTENSIONS NO)
146  cxx_link_system_libraries(${libcxx_target})
147  if (LIBCXX_BENCHMARK_NATIVE_STDLIB)
148    if (LIBCXX_BENCHMARK_NATIVE_STDLIB STREQUAL "libstdc++" AND NOT DEFINED LIBSTDCXX_FILESYSTEM_LIB
149        AND "${name}" STREQUAL "filesystem")
150      return()
151    endif()
152    set(native_target ${name}_native)
153    add_executable(${native_target} EXCLUDE_FROM_ALL ${source_file})
154    add_dependencies(${native_target} google-benchmark-native
155                                      google-benchmark-libcxx)
156    target_link_libraries(${native_target} PRIVATE -lbenchmark)
157    if (LIBCXX_BENCHMARK_NATIVE_STDLIB STREQUAL "libstdc++")
158      target_link_libraries(${native_target} PRIVATE ${LIBSTDCXX_FILESYSTEM_LIB})
159    elseif (LIBCXX_BENCHMARK_NATIVE_STDLIB STREQUAL "libc++")
160      target_link_libraries(${native_target} PRIVATE -lc++fs -lc++experimental)
161    endif()
162    if (LIBCXX_HAS_PTHREAD_LIB)
163      target_link_libraries(${native_target} PRIVATE -pthread)
164    endif()
165    add_dependencies(cxx-benchmarks ${native_target})
166    set_target_properties(${native_target}
167      PROPERTIES
168          OUTPUT_NAME "${name}.native.out"
169          RUNTIME_OUTPUT_DIRECTORY "${BENCHMARK_OUTPUT_DIR}"
170          INCLUDE_DIRECTORIES ""
171          COMPILE_FLAGS "${BENCHMARK_TEST_NATIVE_COMPILE_FLAGS}"
172          LINK_FLAGS "${BENCHMARK_TEST_NATIVE_LINK_FLAGS}"
173          CXX_STANDARD 17
174          CXX_STANDARD_REQUIRED YES
175          CXX_EXTENSIONS NO)
176  endif()
177endfunction()
178
179
180#==============================================================================
181# Register Benchmark tests
182#==============================================================================
183file(GLOB BENCHMARK_TESTS "*.bench.cpp")
184foreach(test_path ${BENCHMARK_TESTS})
185  get_filename_component(test_file "${test_path}" NAME)
186  string(REPLACE ".bench.cpp" "" test_name "${test_file}")
187  if (NOT DEFINED ${test_name}_REPORTED)
188    message(STATUS "Adding Benchmark: ${test_file}")
189    # Only report the adding of the benchmark once.
190    set(${test_name}_REPORTED ON CACHE INTERNAL "")
191  endif()
192  add_benchmark_test(${test_name} ${test_file})
193endforeach()
194
195if (LIBCXX_INCLUDE_TESTS)
196  include(AddLLVM)
197
198  if (NOT DEFINED LIBCXX_TEST_DEPS)
199    message(FATAL_ERROR "Expected LIBCXX_TEST_DEPS to be defined")
200  endif()
201
202  configure_lit_site_cfg(
203          ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.py.in
204          ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg.py)
205
206  set(BENCHMARK_LIT_ARGS "--show-all --show-xfail --show-unsupported ${LIT_ARGS_DEFAULT}")
207
208  add_lit_target(check-cxx-benchmarks
209          "Running libcxx benchmarks tests"
210          ${CMAKE_CURRENT_BINARY_DIR}
211          DEPENDS cxx-benchmarks ${LIBCXX_TEST_DEPS}
212          ARGS ${BENCHMARK_LIT_ARGS})
213endif()
214