| cmake_minimum_required(VERSION 3.13.4) |
| |
| # Use old version of target_sources command which converts the source |
| # file paths to full paths. |
| cmake_policy(SET CMP0076 OLD) |
| list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules") |
| |
| # The top-level sourse and binary directories. |
| set(LIBC_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}) |
| set(LIBC_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}) |
| # The top-level directory in which libc is being built. |
| set(LIBC_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR}) |
| |
| # Path libc/scripts directory. |
| set(LIBC_BUILD_SCRIPTS_DIR "${LIBC_SOURCE_DIR}/utils/build_scripts") |
| |
| set(LIBC_TARGET_OS ${CMAKE_SYSTEM_NAME}) |
| string(TOLOWER ${LIBC_TARGET_OS} LIBC_TARGET_OS) |
| |
| # Defines LIBC_TARGET_ARCHITECTURE and associated macros. |
| include(LLVMLibCArchitectures) |
| include(LLVMLibCCheckMPFR) |
| |
| # Flags to pass down to the compiler while building the libc functions. |
| set(LIBC_COMPILE_OPTIONS_DEFAULT "" CACHE STRING "Architecture to tell clang to optimize for (e.g. -march=... or -mcpu=...)") |
| |
| # Check --print-resource-dir to find the compiler resource dir if this flag |
| # is supported by the compiler. |
| execute_process( |
| OUTPUT_STRIP_TRAILING_WHITESPACE |
| COMMAND ${CMAKE_CXX_COMPILER} --print-resource-dir |
| RESULT_VARIABLE COMMAND_RETURN_CODE |
| OUTPUT_VARIABLE COMPILER_RESOURCE_DIR |
| ) |
| # Retrieve the host compiler's resource dir. |
| if(COMMAND_RETURN_CODE EQUAL 0) |
| set(COMPILER_RESOURCE_DIR |
| "${COMPILER_RESOURCE_DIR}" CACHE PATH "path to compiler resource dir" |
| ) |
| message(STATUS "Set COMPILER_RESOURCE_DIR to " |
| "${COMPILER_RESOURCE_DIR} using --print-resource-dir") |
| else() |
| set(COMPILER_RESOURCE_DIR OFF) |
| message(STATUS "COMPILER_RESOURCE_DIR not set |
| --print-resource-dir not supported by host compiler") |
| endif() |
| |
| option(LLVM_LIBC_FULL_BUILD "Build and test LLVM libc as if it is the full libc" OFF) |
| |
| option(LLVM_LIBC_ENABLE_LINTING "Enables linting of libc source files" OFF) |
| if(LLVM_LIBC_ENABLE_LINTING AND (NOT LLVM_LIBC_FULL_BUILD)) |
| message(FATAL_ERROR "Cannot enable linting when full libc build is not enabled.") |
| endif() |
| if(LLVM_LIBC_ENABLE_LINTING) |
| if("clang-tools-extra" IN_LIST LLVM_ENABLE_PROJECTS |
| AND "clang" IN_LIST LLVM_ENABLE_PROJECTS) |
| add_custom_target(lint-libc) |
| else() |
| message(FATAL_ERROR " |
| 'clang' and 'clang-tools-extra' are required in LLVM_ENABLE_PROJECTS to |
| lint llvm-libc. The linting step performs important checks to help prevent |
| the introduction of subtle bugs, but it may increase build times. |
| |
| To disable linting set LLVM_LIBC_ENABLE_LINTING to OFF |
| (pass -DLLVM_LIBC_ENABLE_LINTING=OFF to cmake).") |
| endif() |
| elseif(LLVM_LIBC_FULL_BUILD) |
| message(WARNING " |
| Linting for libc is currently disabled. |
| |
| This is not recommended, to enable set LLVM_LIBC_ENABLE_LINTING to ON |
| (pass -DLLVM_LIBC_ENABLE_LINTING=ON to cmake).") |
| endif() |
| |
| option(LLVM_LIBC_INCLUDE_SCUDO "Include the SCUDO standalone as the allocator for LLVM libc" OFF) |
| if(LLVM_LIBC_INCLUDE_SCUDO) |
| if (NOT "compiler-rt" IN_LIST LLVM_ENABLE_PROJECTS) |
| message(FATAL_ERROR "SCUDO cannot be included without adding compiler-rt to LLVM_ENABLE_PROJECTS") |
| endif() |
| endif() |
| |
| include(CMakeParseArguments) |
| include(LLVMLibCRules) |
| include(LLVMLibCCheckCpuFeatures) |
| |
| if(EXISTS "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE}/entrypoints.txt") |
| set(entrypoint_file "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE}/entrypoints.txt") |
| elseif(EXISTS "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/entrypoints.txt") |
| set(entrypoint_file "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/entrypoints.txt") |
| else() |
| message(FATAL_ERROR "entrypoints.txt file for the target platform not found.") |
| endif() |
| include(${entrypoint_file}) |
| |
| if(EXISTS "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE}/headers.txt") |
| include("${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE}/headers.txt") |
| elseif(EXISTS "${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/headers.txt") |
| include("${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/headers.txt") |
| endif() |
| |
| set(TARGET_ENTRYPOINT_NAME_LIST "") |
| foreach(entrypoint IN LISTS TARGET_LLVMLIBC_ENTRYPOINTS) |
| string(FIND ${entrypoint} "." last_dot_loc REVERSE) |
| if(${last_dot_loc} EQUAL -1) |
| message(FATAL "Invalid entrypoint target name ${entrypoint}; Expected a '.' " |
| "(dot) in the name.") |
| endif() |
| math(EXPR name_loc "${last_dot_loc} + 1") |
| string(SUBSTRING ${entrypoint} ${name_loc} -1 entrypoint_name) |
| list(APPEND TARGET_ENTRYPOINT_NAME_LIST ${entrypoint_name}) |
| endforeach() |
| |
| if(LLVM_LIBC_FULL_BUILD) |
| # We need to set up hdrgen first since other targets depend on it. |
| add_subdirectory(utils/LibcTableGenUtil) |
| add_subdirectory(utils/HdrGen) |
| endif() |
| |
| add_subdirectory(include) |
| add_subdirectory(config) |
| add_subdirectory(src) |
| add_subdirectory(utils) |
| |
| if(LLVM_LIBC_FULL_BUILD) |
| # The loader can potentially depend on the library components so add it |
| # after the library implementation directories. |
| add_subdirectory(loader) |
| endif() |
| |
| # The lib and test directories are added at the very end as tests |
| # and libraries potentially draw from the components present in all |
| # of the other directories. |
| add_subdirectory(lib) |
| if(LLVM_INCLUDE_TESTS) |
| add_subdirectory(test) |
| add_subdirectory(fuzzing) |
| endif() |
| |
| add_subdirectory(benchmarks) |