libc/CMakeLists.txt

   1 cmake_minimum_required(VERSION 3.13.4)
   2
   3 # Use old version of target_sources command which converts the source
   4 # file paths to full paths.
   5 cmake_policy(SET CMP0076 OLD)
   6 list(APPEND CMAKE_MODULE_PATH  "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
   7
   8 # The top-level source directory of libc.
   9 set(LIBC_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
  10 # The top-level directory in which libc is being built.
  11 set(LIBC_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR})
  12
  13 # Path libc/scripts directory.
  14 set(LIBC_BUILD_SCRIPTS_DIR "${LIBC_SOURCE_DIR}/utils/build_scripts")
  15
  16
  17 set(LIBC_TARGET_OS ${CMAKE_SYSTEM_NAME})
  18 string(TOLOWER ${LIBC_TARGET_OS} LIBC_TARGET_OS)
  19
  20 set(LIBC_TARGET_MACHINE ${CMAKE_SYSTEM_PROCESSOR})
  21
  22 # Check --print-resource-dir to find the compiler resource dir if this flag
  23 # is supported by the compiler.
  24 execute_process(
  25   OUTPUT_STRIP_TRAILING_WHITESPACE
  26   COMMAND ${CMAKE_CXX_COMPILER} --print-resource-dir
  27   RESULT_VARIABLE COMMAND_RETURN_CODE
  28   OUTPUT_VARIABLE COMPILER_RESOURCE_DIR
  29 )
  30 # Retrieve the host compiler's resource dir.
  31 if(COMMAND_RETURN_CODE EQUAL 0)
  32   set(COMPILER_RESOURCE_DIR
  33     "${COMPILER_RESOURCE_DIR}" CACHE PATH "path to compiler resource dir"
  34   )
  35   message(STATUS "Set COMPILER_RESOURCE_DIR to "
  36                  "${COMPILER_RESOURCE_DIR} using --print-resource-dir")
  37 else()
  38   set(COMPILER_RESOURCE_DIR OFF)
  39   message(STATUS "COMPILER_RESOURCE_DIR not set
  40                   --print-resource-dir not supported by host compiler")
  41 endif()
  42
  43 option(LLVM_LIBC_ENABLE_LINTING "Enables linting of libc source files" ON)
  44 if(LLVM_LIBC_ENABLE_LINTING)
  45   if("clang-tools-extra" IN_LIST LLVM_ENABLE_PROJECTS
  46              AND "clang" IN_LIST LLVM_ENABLE_PROJECTS)
  47     add_custom_target(lint-libc)
  48   else()
  49     message(FATAL_ERROR "
  50       'clang' and 'clang-tools-extra' are required in LLVM_ENABLE_PROJECTS to
  51       lint llvm-libc. The linting step performs important checks to help prevent
  52       the introduction of subtle bugs, but it may increase build times.
  53
  54       To disable linting set LLVM_LIBC_ENABLE_LINTING to OFF
  55       (pass -DLLVM_LIBC_ENABLE_LINTING=OFF to cmake).")
  56   endif()
  57 else()
  58   message(WARNING "
  59     Linting for libc is currently disabled.
  60
  61     This is not recommended, to enable set LLVM_LIBC_ENABLE_LINTING to ON
  62     (pass -DLLVM_LIBC_ENABLE_LINTING=ON to cmake).")
  63 endif()
  64
  65 include(CMakeParseArguments)
  66 include(LLVMLibCRules)
  67 include(LLVMLibCCheckCpuFeatures)
  68
  69 include("${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_MACHINE}/entrypoints.txt")
  70 include("${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_MACHINE}/headers.txt")
  71
  72 set(TARGET_ENTRYPOINT_NAME_LIST "")
  73 foreach(entrypoint IN LISTS TARGET_LIBC_ENTRYPOINTS TARGET_LIBM_ENTRYPOINTS)
  74   string(FIND ${entrypoint} "." last_dot_loc REVERSE)
  75   if(${last_dot_loc} EQUAL -1)
  76     message(FATAL "Invalid entrypoint target name ${entrypoint}; Expected a '.' "
  77                   "(dot) in the name.")
  78   endif()
  79   math(EXPR name_loc "${last_dot_loc} + 1")
  80   string(SUBSTRING ${entrypoint} ${name_loc} -1 entrypoint_name)
  81   list(APPEND TARGET_ENTRYPOINT_NAME_LIST ${entrypoint_name})
  82 endforeach()
  83
  84 add_subdirectory(include)
  85 add_subdirectory(config)
  86 add_subdirectory(src)
  87 add_subdirectory(utils)
  88
  89 # The loader can potentially depend on the library components so add it
  90 # after the library implementation directories.
  91 add_subdirectory(loader)
  92
  93 # The lib and test directories are added at the very end as tests
  94 # and libraries potentially draw from the components present in all
  95 # of the other directories.
  96 add_subdirectory(lib)
  97 if(LLVM_INCLUDE_TESTS)
  98   add_subdirectory(test)
  99   add_subdirectory(fuzzing)
 100 endif()
 101
 102 add_subdirectory(benchmarks)