2020-04-10 11:41:22 +08:00
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cmake_minimum_required(VERSION 3.13.4)
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2019-10-05 01:30:54 +08:00
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2020-01-27 13:50:27 +08:00
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# Use old version of target_sources command which converts the source
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# file paths to full paths.
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cmake_policy(SET CMP0076 OLD)
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2019-10-05 01:30:54 +08:00
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list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
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2021-03-20 12:50:48 +08:00
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# The top-level sourse and binary directories.
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2019-10-05 01:30:54 +08:00
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set(LIBC_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
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2021-03-20 12:50:48 +08:00
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set(LIBC_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
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2019-10-05 01:30:54 +08:00
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# The top-level directory in which libc is being built.
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set(LIBC_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR})
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# Path libc/scripts directory.
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set(LIBC_BUILD_SCRIPTS_DIR "${LIBC_SOURCE_DIR}/utils/build_scripts")
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2021-03-31 12:08:18 +08:00
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set(LIBC_INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX} CACHE PATH "Define libc destination prefix.")
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2019-10-05 01:30:54 +08:00
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set(LIBC_TARGET_OS ${CMAKE_SYSTEM_NAME})
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string(TOLOWER ${LIBC_TARGET_OS} LIBC_TARGET_OS)
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set(LIBC_TARGET_MACHINE ${CMAKE_SYSTEM_PROCESSOR})
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2020-05-22 08:39:03 +08:00
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# Check --print-resource-dir to find the compiler resource dir if this flag
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# is supported by the compiler.
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execute_process(
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OUTPUT_STRIP_TRAILING_WHITESPACE
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COMMAND ${CMAKE_CXX_COMPILER} --print-resource-dir
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RESULT_VARIABLE COMMAND_RETURN_CODE
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OUTPUT_VARIABLE COMPILER_RESOURCE_DIR
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)
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# Retrieve the host compiler's resource dir.
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if(COMMAND_RETURN_CODE EQUAL 0)
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set(COMPILER_RESOURCE_DIR
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"${COMPILER_RESOURCE_DIR}" CACHE PATH "path to compiler resource dir"
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)
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2020-05-29 05:52:39 +08:00
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message(STATUS "Set COMPILER_RESOURCE_DIR to "
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"${COMPILER_RESOURCE_DIR} using --print-resource-dir")
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2020-05-22 08:39:03 +08:00
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else()
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set(COMPILER_RESOURCE_DIR OFF)
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message(STATUS "COMPILER_RESOURCE_DIR not set
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--print-resource-dir not supported by host compiler")
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endif()
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2021-01-22 14:55:12 +08:00
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option(LLVM_LIBC_ENABLE_LINTING "Enables linting of libc source files" OFF)
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2020-04-17 08:40:36 +08:00
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if(LLVM_LIBC_ENABLE_LINTING)
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if("clang-tools-extra" IN_LIST LLVM_ENABLE_PROJECTS
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AND "clang" IN_LIST LLVM_ENABLE_PROJECTS)
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add_custom_target(lint-libc)
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else()
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message(FATAL_ERROR "
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2020-05-21 11:07:52 +08:00
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'clang' and 'clang-tools-extra' are required in LLVM_ENABLE_PROJECTS to
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2020-04-17 08:40:36 +08:00
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lint llvm-libc. The linting step performs important checks to help prevent
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the introduction of subtle bugs, but it may increase build times.
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To disable linting set LLVM_LIBC_ENABLE_LINTING to OFF
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(pass -DLLVM_LIBC_ENABLE_LINTING=OFF to cmake).")
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endif()
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else()
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message(WARNING "
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Linting for libc is currently disabled.
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This is not recommended, to enable set LLVM_LIBC_ENABLE_LINTING to ON
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(pass -DLLVM_LIBC_ENABLE_LINTING=ON to cmake).")
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endif()
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2021-03-12 07:25:24 +08:00
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option(LLVM_LIBC_FULL_BUILD "Build and test LLVM libc as if it is the full libc" OFF)
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2019-10-05 01:30:54 +08:00
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include(CMakeParseArguments)
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include(LLVMLibCRules)
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[libc] Adding memcpy implementation for x86_64
Summary:
The patch is not ready yet and is here to discuss a few options:
- How do we customize the implementation? (i.e. how to define `kRepMovsBSize`),
- How do we specify custom compilation flags? (We'd need `-fno-builtin-memcpy` to be passed in),
- How do we build? We may want to test in debug but build the libc with `-march=native` for instance,
- Clang has a brand new builtin `__builtin_memcpy_inline` which makes the implementation easy and efficient, but:
- If we compile with `gcc` or `msvc` we can't use it, resorting on less efficient code generation,
- With gcc we can use `__builtin_memcpy` but then we'd need a postprocess step to check that the final assembly do not contain call to `memcpy` (unlikely but allowed),
- For msvc we'd need to resort on the compiler optimization passes.
Reviewers: sivachandra, abrachet
Subscribers: mgorny, MaskRay, tschuett, libc-commits, courbet
Tags: #libc-project
Differential Revision: https://reviews.llvm.org/D74397
2020-02-11 20:37:02 +08:00
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include(LLVMLibCCheckCpuFeatures)
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2019-10-05 01:30:54 +08:00
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2020-06-09 15:31:48 +08:00
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include("${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_MACHINE}/entrypoints.txt")
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include("${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_MACHINE}/headers.txt")
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set(TARGET_ENTRYPOINT_NAME_LIST "")
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2021-02-24 13:19:05 +08:00
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foreach(entrypoint IN LISTS TARGET_LLVMLIBC_ENTRYPOINTS)
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2020-06-09 15:31:48 +08:00
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string(FIND ${entrypoint} "." last_dot_loc REVERSE)
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if(${last_dot_loc} EQUAL -1)
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message(FATAL "Invalid entrypoint target name ${entrypoint}; Expected a '.' "
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"(dot) in the name.")
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endif()
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math(EXPR name_loc "${last_dot_loc} + 1")
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string(SUBSTRING ${entrypoint} ${name_loc} -1 entrypoint_name)
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list(APPEND TARGET_ENTRYPOINT_NAME_LIST ${entrypoint_name})
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endforeach()
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2021-03-12 07:25:24 +08:00
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if(LLVM_LIBC_FULL_BUILD)
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# We need to set up hdrgen first since other targets depend on it.
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add_subdirectory(utils/LibcTableGenUtil)
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add_subdirectory(utils/HdrGen)
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endif()
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2021-01-22 14:55:12 +08:00
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2020-10-13 01:03:19 +08:00
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add_subdirectory(include)
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add_subdirectory(config)
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2020-03-05 07:45:51 +08:00
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add_subdirectory(src)
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2019-11-06 03:40:26 +08:00
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add_subdirectory(utils)
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2020-01-04 04:00:45 +08:00
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2021-03-12 07:25:24 +08:00
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if(LLVM_LIBC_FULL_BUILD)
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# The loader can potentially depend on the library components so add it
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# after the library implementation directories.
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add_subdirectory(loader)
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endif()
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2020-03-19 03:46:33 +08:00
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2020-01-04 04:00:45 +08:00
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# The lib and test directories are added at the very end as tests
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# and libraries potentially draw from the components present in all
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# of the other directories.
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add_subdirectory(lib)
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2020-03-23 13:50:16 +08:00
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if(LLVM_INCLUDE_TESTS)
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add_subdirectory(test)
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add_subdirectory(fuzzing)
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endif()
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2020-06-16 04:54:53 +08:00
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add_subdirectory(benchmarks)
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