1 cmake_minimum_required(VERSION 3.20.0)
3 # Include LLVM's cmake policies.
4 if(NOT DEFINED LLVM_COMMON_CMAKE_UTILS)
5 set(LLVM_COMMON_CMAKE_UTILS ${CMAKE_CURRENT_SOURCE_DIR}/../cmake)
7 include(${LLVM_COMMON_CMAKE_UTILS}/Modules/CMakePolicy.cmake
11 set(CMAKE_CXX_STANDARD 17)
13 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
15 # The top-level source directory.
16 set(LIBC_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
17 # The top-level directory in which libc is being built.
18 set(LIBC_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR})
20 set(LIBC_ENABLE_USE_BY_CLANG OFF CACHE BOOL "Whether or not to place libc in a build directory findable by a just built clang")
22 if(LLVM_LIBC_FULL_BUILD OR LIBC_GPU_BUILD OR LIBC_GPU_ARCHITECTURES)
23 if(NOT LIBC_HDRGEN_EXE)
24 # We need to set up hdrgen first since other targets depend on it.
25 add_subdirectory(utils/LibcTableGenUtil)
26 add_subdirectory(utils/HdrGen)
28 message(STATUS "Will use ${LIBC_HDRGEN_EXE} for libc header generation.")
32 option(LIBC_HDRGEN_ONLY "Only build the 'libc-hdrgen' executable" OFF)
33 if(("libc" IN_LIST LLVM_ENABLE_RUNTIMES AND NOT LLVM_RUNTIMES_BUILD) OR
35 # When libc is build as part of the runtimes/bootstrap build's CMake run, we
36 # only need to build the host tools to build the libc. So, we just do enough
37 # to build libc-hdrgen and return.
39 # Always make the RPC server availible to other projects for GPU mode.
40 if(LIBC_GPU_BUILD OR LIBC_GPU_ARCHITECTURES)
41 add_subdirectory(utils/gpu/server)
46 option(LIBC_CMAKE_VERBOSE_LOGGING
47 "Log details warnings and notifications during CMake configuration." OFF)
48 # Path libc/scripts directory.
49 set(LIBC_BUILD_SCRIPTS_DIR "${LIBC_SOURCE_DIR}/utils/build_scripts")
51 # Flags to pass down to the compiler while building the libc functions.
52 set(LIBC_COMPILE_OPTIONS_DEFAULT "" CACHE STRING "Architecture to tell clang to optimize for (e.g. -march=... or -mcpu=...)")
54 include(common_libc_tuners.cmake)
56 list(APPEND LIBC_COMPILE_OPTIONS_DEFAULT ${LIBC_COMMON_TUNE_OPTIONS})
58 # Check --print-resource-dir to find the compiler resource dir if this flag
59 # is supported by the compiler.
61 OUTPUT_STRIP_TRAILING_WHITESPACE
62 COMMAND ${CMAKE_CXX_COMPILER} --print-resource-dir
63 RESULT_VARIABLE COMMAND_RETURN_CODE
64 OUTPUT_VARIABLE COMPILER_RESOURCE_DIR
66 # Retrieve the host compiler's resource dir.
67 if(COMMAND_RETURN_CODE EQUAL 0)
68 set(COMPILER_RESOURCE_DIR
69 "${COMPILER_RESOURCE_DIR}" CACHE PATH "path to compiler resource dir"
71 message(STATUS "Set COMPILER_RESOURCE_DIR to "
72 "${COMPILER_RESOURCE_DIR} using --print-resource-dir")
74 set(COMPILER_RESOURCE_DIR OFF)
75 message(STATUS "COMPILER_RESOURCE_DIR not set
76 --print-resource-dir not supported by host compiler")
79 option(LLVM_LIBC_FULL_BUILD "Build and test LLVM libc as if it is the full libc" OFF)
80 option(LLVM_LIBC_IMPLEMENTATION_DEFINED_TEST_BEHAVIOR "Build LLVM libc tests assuming our implementation-defined behavior" ON)
81 option(LLVM_LIBC_ENABLE_LINTING "Enables linting of libc source files" OFF)
83 option(LIBC_GPU_BUILD "Build libc for the GPU. All CPU build options will be ignored." OFF)
84 set(LIBC_TARGET_TRIPLE "" CACHE STRING "The target triple for the libc build.")
86 set(LIBC_ENABLE_UNITTESTS ON)
87 set(LIBC_ENABLE_HERMETIC_TESTS ${LLVM_LIBC_FULL_BUILD})
89 # Defines LIBC_TARGET_ARCHITECTURE and associated macros.
90 include(LLVMLibCArchitectures)
92 if(LIBC_TARGET_ARCHITECTURE_IS_GPU)
93 set(LIBC_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/include)
94 set(LIBC_INSTALL_INCLUDE_DIR ${CMAKE_INSTALL_INCLUDEDIR}/gpu-none-llvm)
95 set(LIBC_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
96 elseif(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND LIBC_ENABLE_USE_BY_CLANG)
97 set(LIBC_INCLUDE_DIR ${LLVM_BINARY_DIR}/include/${LLVM_DEFAULT_TARGET_TRIPLE})
98 set(LIBC_INSTALL_INCLUDE_DIR ${CMAKE_INSTALL_INCLUDEDIR}/${LLVM_DEFAULT_TARGET_TRIPLE})
99 set(LIBC_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE})
101 if(NOT LIBC_ENABLE_USE_BY_CLANG)
102 set(LIBC_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/include)
103 set(LIBC_LIBRARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/lib)
104 elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
105 set(LIBC_INCLUDE_DIR ${LLVM_BINARY_DIR}/include)
106 set(LIBC_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
108 set(LIBC_INCLUDE_DIR ${CMAKE_BINARY_DIR}/include)
109 set(LIBC_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX})
111 set(LIBC_INSTALL_INCLUDE_DIR ${CMAKE_INSTALL_INCLUDEDIR})
114 if(LIBC_TARGET_ARCHITECTURE_IS_GPU)
115 include(prepare_libc_gpu_build)
116 set(LIBC_ENABLE_UNITTESTS OFF)
119 include(LLVMLibCCheckMPFR)
121 if(LLVM_LIBC_CLANG_TIDY)
122 set(LLVM_LIBC_ENABLE_LINTING ON)
125 if(LLVM_LIBC_ENABLE_LINTING)
126 if(NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
127 set(LLVM_LIBC_ENABLE_LINTING OFF)
128 message(WARNING "C++ compiler is not clang++, linting with be disabled.")
130 if (NOT LLVM_LIBC_CLANG_TIDY)
131 find_program(LLVM_LIBC_CLANG_TIDY NAMES clang-tidy)
134 if(LLVM_LIBC_CLANG_TIDY)
135 # Check clang-tidy major version.
136 execute_process(COMMAND ${LLVM_LIBC_CLANG_TIDY} "--version"
137 OUTPUT_VARIABLE CLANG_TIDY_OUTPUT)
138 string(REGEX MATCH "[0-9]+" CLANG_TIDY_VERSION "${CLANG_TIDY_OUTPUT}")
139 string(REGEX MATCH "[0-9]+" CLANG_MAJOR_VERSION
140 "${CMAKE_CXX_COMPILER_VERSION}")
141 if(NOT CLANG_TIDY_VERSION EQUAL CLANG_MAJOR_VERSION)
142 set(LLVM_LIBC_ENABLE_LINTING OFF)
144 'clang-tidy' (version ${CLANG_TIDY_VERSION}) is not the same as
145 'clang' (version ${CLANG_MAJOR_VERSION}). Linting will
148 The path to the clang-tidy binary can be set manually by passing
149 -DLLVM_LIBC_CLANG_TIDY=<path/to/clang-tidy> to CMake.")
151 add_custom_target(libc-lint)
153 message(FATAL_ERROR "
154 Linting is enabled but 'clang-tidy' is not found!
156 The path to the clang-tidy binary can be set manually by passing
157 -DLLVM_LIBC_CLANG_TIDY=<path/to/clang-tidy> to CMake.
159 To disable linting set LLVM_LIBC_ENABLE_LINTING to OFF
160 (pass -DLLVM_LIBC_ENABLE_LINTING=OFF to cmake).")
165 option(LLVM_LIBC_INCLUDE_SCUDO "Include the SCUDO standalone as the allocator for LLVM libc" OFF)
166 if(LLVM_LIBC_INCLUDE_SCUDO)
167 if (NOT "compiler-rt" IN_LIST LLVM_ENABLE_PROJECTS)
168 message(FATAL_ERROR "SCUDO cannot be included without adding compiler-rt to LLVM_ENABLE_PROJECTS")
172 option(LIBC_INCLUDE_DOCS "Build the libc documentation." ${LLVM_INCLUDE_DOCS})
174 include(CMakeParseArguments)
175 include(LLVMLibCCheckCpuFeatures)
176 include(LLVMLibCRules)
178 if(EXISTS "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE}/entrypoints.txt")
179 set(entrypoint_file "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE}/entrypoints.txt")
180 elseif(EXISTS "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/entrypoints.txt")
181 set(entrypoint_file "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/entrypoints.txt")
183 message(FATAL_ERROR "entrypoints.txt file for the target platform '${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE}' not found.")
185 include(${entrypoint_file})
187 if(EXISTS "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE}/headers.txt")
188 include("${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE}/headers.txt")
189 elseif(EXISTS "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/headers.txt")
190 include("${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/headers.txt")
193 set(TARGET_ENTRYPOINT_NAME_LIST "")
194 foreach(entrypoint IN LISTS TARGET_LLVMLIBC_ENTRYPOINTS)
195 string(FIND ${entrypoint} "." last_dot_loc REVERSE)
196 if(${last_dot_loc} EQUAL -1)
197 message(FATAL "Invalid entrypoint target name ${entrypoint}; Expected a '.' "
198 "(dot) in the name.")
200 math(EXPR name_loc "${last_dot_loc} + 1")
201 string(SUBSTRING ${entrypoint} ${name_loc} -1 entrypoint_name)
202 list(APPEND TARGET_ENTRYPOINT_NAME_LIST ${entrypoint_name})
205 set(LIBC_INSTALL_DEPENDS)
206 if(LLVM_LIBC_FULL_BUILD)
207 set(LIBC_INSTALL_DEPENDS "install-libc-static-archives;install-libc-headers")
208 if(NOT LIBC_TARGET_OS_IS_BAREMETAL)
209 # For now we will disable libc-startup installation for baremetal. The
210 # correct way to do it would be to make a hookable startup for baremetal
211 # and install it as part of the libc installation.
212 list(APPEND LIBC_INSTALL_DEPENDS "libc-startup")
215 set(LIBC_INSTALL_DEPENDS install-libc-static-archives)
218 add_subdirectory(include)
219 add_subdirectory(config)
220 add_subdirectory(src)
221 add_subdirectory(utils)
223 if(LLVM_LIBC_FULL_BUILD)
224 # The startup system can potentially depend on the library components so add
225 # it after the library implementation directories.
226 add_subdirectory(startup)
229 # The lib and test directories are added at the very end as tests
230 # and libraries potentially draw from the components present in all
231 # of the other directories.
232 # TODO: Add testing support for the libc GPU target.
233 add_subdirectory(lib)
234 if(LLVM_INCLUDE_TESTS)
235 add_subdirectory(test)
236 add_subdirectory(fuzzing)
239 if(LIBC_INCLUDE_BENCHMARKS)
240 add_subdirectory(benchmarks)
243 if (LIBC_INCLUDE_DOCS)
244 add_subdirectory(docs)
248 if(LLVM_LIBC_FULL_BUILD)
249 add_llvm_install_targets(
252 COMPONENT libc-headers
256 add_llvm_install_targets(
258 DEPENDS ${LIBC_INSTALL_DEPENDS}