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Add CMake build system
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‎CMakeLists.txt

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cmake_minimum_required(VERSION 3.16.3)
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project(wasi-libc LANGUAGES C)
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enable_testing()
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if("${CMAKE_C_COMPILER}" MATCHES "(.*)clang(-[0-9]+)?$")
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set(CMAKE_NM "${CMAKE_MATCH_1}llvm-nm${CMAKE_MATCH_2}")
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endif()
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find_package(Python COMPONENTS Interpreter REQUIRED)
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set(TARGET_TRIPLE wasm32-wasi)
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set(MULTIARCH_TRIPLE wasm32-wasi)
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set(CMAKE_C_COMPILER_TARGET ${TARGET_TRIPLE} CACHE STRING "The target to compile for")
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# note that pthread support is still a work-in-progress.
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set(THREAD_MODEL "single" CACHE STRING "single or posix")
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set(MALLOC_IMPL "dlmalloc" CACHE STRING "dlmalloc or none")
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option(BUILD_LIBC_TOP_HALF "Build libc top half" ON)
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# When the length is no larger than this threshold, we consider the
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# overhead of bulk memory opcodes to outweigh the performance benefit,
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# and fall back to the original musl implementation. See
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# https://github.com/WebAssembly/wasi-libc/pull/263 for relevant
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# discussion
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set(BULK_MEMORY_THRESHOLD "32" CACHE STRING "bulk memory threshold")
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add_subdirectory(cmake)

‎cmake/CMakeLists.txt

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set(LIBC_BOTTOM_HALF_HEADERS_PUBLIC_DIR ${PROJECT_SOURCE_DIR}/libc-bottom-half/headers/public)
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set(LIBC_TOP_HALF_MUSL_DIR ${PROJECT_SOURCE_DIR}/libc-top-half/musl)
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set(LIBC_TOP_HALF_MUSL_SRC_DIR ${LIBC_TOP_HALF_MUSL_DIR}/src)
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set(LIBC_BOTTOM_HALF_DIR ${PROJECT_SOURCE_DIR}/libc-bottom-half)
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set(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_DIR ${LIBC_BOTTOM_HALF_DIR}/cloudlibc/src)
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set(INSTALL_LIB_DIR lib/${MULTIARCH_TRIPLE})
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set(INSTALL_SHARE_DIR share/${MULTIARCH_TRIPLE})
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include(global-compiler-options.cmake)
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include(local-sysroot.cmake)
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include(predefined-macros.cmake)
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include(libc-imports.cmake)
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add_subdirectory(libc-bottom-half)
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add_subdirectory(libc-top-half)
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if(${MALLOC_IMPL} STREQUAL "dlmalloc")
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add_subdirectory(dlmalloc)
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endif()
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add_library(wasi-emulated-signal)
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target_link_libraries(wasi-emulated-signal
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wasi-emulated-signal-musl-objs
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wasi-emulated-signal-objs
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)
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add_custom_command(TARGET wasi-emulated-signal POST_BUILD
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COMMAND ${CMAKE_C_COMPILER_AR} crs $<TARGET_FILE:c>
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)
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add_library(c)
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set (LIBC_LINK_LIBRARIES
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libc-bottom-half
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)
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if(${BUILD_LIBC_TOP_HALF} STREQUAL "ON")
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list(APPEND LIBC_LINK_LIBRARIES
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libc-top-half
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)
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endif()
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if(${MALLOC_IMPL} STREQUAL "dlmalloc")
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list(APPEND LIBC_LINK_LIBRARIES
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dlmalloc)
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elseif(${MALLOC_IMPL} STREQUAL "none")
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# nothing to do here
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else()
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message(FATAL_ERROR "unknown malloc implementation ${MALLOC_IMPL}")
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endif()
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target_link_libraries(c
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PRIVATE
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${LIBC_LINK_LIBRARIES}
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)
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add_custom_command(TARGET c POST_BUILD
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COMMAND ${CMAKE_C_COMPILER_AR} crs $<TARGET_FILE:c>
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)
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add_dependencies(c sysroot-headers)
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# Create empty placeholder libraries.
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foreach(stub m rt pthread crypt util xnet resolve dl)
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set(lib_path ${SYSROOT_LIB_DIR}/lib${stub}.a)
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add_custom_command(OUTPUT ${lib_path}
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COMMAND ${CMAKE_COMMAND} -E make_directory ${SYSROOT_LIB_DIR}
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COMMAND ${CMAKE_C_COMPILER_AR} crs ${lib_path})
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add_custom_target(${stub} ALL
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DEPENDS ${lib_path})
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endforeach()
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install(
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TARGETS
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c
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c-printscan-long-double
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c-printscan-no-floating-point
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wasi-emulated-mman
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wasi-emulated-process-clocks
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wasi-emulated-getpid
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wasi-emulated-signal
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ARCHIVE DESTINATION ${INSTALL_LIB_DIR}
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LIBRARY DESTINATION ${INSTALL_LIB_DIR}
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)
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install(
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DIRECTORY ${SYSROOT_INC_DIR}
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DESTINATION .
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)
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install(
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DIRECTORY ${SYSROOT_SHARE_DIR}
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DESTINATION share
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)
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install(
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DIRECTORY ${SYSROOT_LIB_DIR}
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DESTINATION lib
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)
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add_test(NAME check-metadata
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COMMAND diff -wur
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${PROJECT_SOURCE_DIR}/expected/${MULTIARCH_TRIPLE}/${THREAD_MODEL}/predefined-macros.txt
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${CMAKE_BINARY_DIR}/sysroot/share/${MULTIARCH_TRIPLE}/predefined-macros.txt)
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add_test(NAME check-headers
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COMMAND ${CMAKE_C_COMPILER}
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-target ${CMAKE_C_COMPILER_TARGET}
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--sysroot=${CMAKE_BINARY_DIR}/sysroot
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-fsyntax-only
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"-Wno#warnings"
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${CMAKE_BINARY_DIR}/sysroot/share/${MULTIARCH_TRIPLE}/include-all.c)

‎cmake/dlmalloc/CMakeLists.txt

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set(DLMALLOC_DIR ${PROJECT_SOURCE_DIR}/dlmalloc)
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add_library(dlmalloc OBJECT
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${DLMALLOC_DIR}/src/dlmalloc.c)
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target_include_directories(dlmalloc
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PRIVATE
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${DLMALLOC_DIR}/include)
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add_dependencies(dlmalloc sysroot-headers)

‎cmake/global-compiler-options.cmake

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# WebAssembly floating-point match doesn't trap.
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# TODO: Add -fno-signaling-nans when the compiler supports it.
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add_compile_options(-fno-trapping-math)
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# Add all warnings, but disable a few which occur in third-party code.
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add_compile_options(
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-Wall -Wextra -Werror
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-Wno-null-pointer-arithmetic
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-Wno-unused-parameter
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-Wno-sign-compare
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-Wno-unused-variable
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-Wno-unused-function
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-Wno-ignored-attributes
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-Wno-missing-braces
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-Wno-ignored-pragmas
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-Wno-unused-but-set-variable
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-Wno-unknown-warning-option
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)
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# Configure support for threads
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if("${THREAD_MODEL}" STREQUAL "single")
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add_compile_options(-mthread-model single)
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elseif("${THREAD_MODEL}" STREQUAL "posix")
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add_compile_options(-mthread-model posix -pthread -ftls-model=local-exec)
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endif()
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# Expose the public headers to the implementation. We use `-isystem` for
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# purpose for two reasons:
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#
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# 1. It only does `<...>` not `"...."` lookup. We are making a libc,
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# which is a system library, so all public headers should be
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# accessible via `<...>` and never also need `"..."`. `-isystem` main
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# purpose is to only effect `<...>` lookup.
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#
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# 2. The `-I` for private headers added for specific C files below
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# should come earlier in the search path, so they can "override"
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# and/or `#include_next` the public headers. `-isystem` (like
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# `-idirafter`) comes later in the search path than `-I`.
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include_directories(SYSTEM ${CMAKE_BINARY_DIR}/sysroot/include)

‎cmake/libc-bottom-half/CMakeLists.txt

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set(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_INC_DIR ${LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_DIR}/include)
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set(LIBC_BOTTOM_HALF_SRC_DIR ${LIBC_BOTTOM_HALF_DIR}/sources)
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set(LIBC_BOTTOM_HALF_HEADERS_PRIVATE_DIR ${LIBC_BOTTOM_HALF_DIR}/headers/private)
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file(GLOB_RECURSE
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LIBC_BOTTOM_HALF_ALL_SOURCES
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CONFIGURE_DEPENDS
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${LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_DIR}/*.c
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${LIBC_BOTTOM_HALF_SRC_DIR}/*.c)
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set(LIBC_BOTTOM_HALF_INC_DIRS
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${LIBC_BOTTOM_HALF_HEADERS_PRIVATE_DIR}
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${LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_INC_DIR}
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${LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_DIR}
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${LIBC_TOP_HALF_MUSL_SRC_DIR}/include
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${LIBC_TOP_HALF_MUSL_SRC_DIR}/internal
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)
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# FIXME(https://reviews.llvm.org/D85567) - due to a bug in LLD the weak
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# references to a function defined in `chdir.c` only work if `chdir.c` is at the
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# end of the archive, but once that LLD review lands and propagates into LLVM
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# then we don't have to do this.
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set(CHDIR_SRC "${LIBC_BOTTOM_HALF_SRC_DIR}/chdir.c")
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list(REMOVE_ITEM LIBC_BOTTOM_HALF_ALL_SOURCES ${CHDIR_SRC})
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list(APPEND LIBC_BOTTOM_HALF_ALL_SOURCES ${CHDIR_SRC})
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add_library(libc-bottom-half OBJECT
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${LIBC_BOTTOM_HALF_ALL_SOURCES})
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add_dependencies(libc-bottom-half sysroot-headers)
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target_include_directories(libc-bottom-half
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PRIVATE
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${LIBC_BOTTOM_HALF_INC_DIRS}
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SYSTEM
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${SYSROOT_INC_DIR}
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)
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add_subdirectory(clocks)
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add_subdirectory(getpid)
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add_subdirectory(mman)
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add_subdirectory(signal)
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add_subdirectory(crt1)

‎cmake/libc-bottom-half/clocks/CMakeLists.txt

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file(GLOB_RECURSE
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CLOCKS_SOURCES
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${LIBC_BOTTOM_HALF_DIR}/clocks/*.c)
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add_library(wasi-emulated-process-clocks STATIC
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${CLOCKS_SOURCES})
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target_include_directories(wasi-emulated-process-clocks
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PRIVATE
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${LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_DIR})
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add_dependencies(wasi-emulated-process-clocks sysroot-headers)
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add_custom_command(TARGET wasi-emulated-process-clocks POST_BUILD
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COMMAND ${CMAKE_C_COMPILER_AR} crs $<TARGET_FILE:c>
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)

‎cmake/libc-bottom-half/crt1/CMakeLists.txt

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file(GLOB
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LIBC_BOTTOM_HALF_CRT_SOURCES
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CONFIGURE_DEPENDS
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${LIBC_BOTTOM_HALF_DIR}/crt/*.c)
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foreach(crt_path ${LIBC_BOTTOM_HALF_CRT_SOURCES})
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get_filename_component(crt_name ${crt_path} NAME_WLE)
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add_library(${crt_name} OBJECT ${crt_path})
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target_include_directories(${crt_name}
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PRIVATE
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${LIBC_BOTTOM_HALF_INC_DIRS}
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)
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add_dependencies(${crt_name} sysroot-headers)
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add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/sysroot/lib/${crt_name}.o
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COMMAND ${CMAKE_COMMAND} -E make_directory ${SYSROOT_LIB_DIR}
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COMMAND ${CMAKE_COMMAND} -E copy_if_different $<TARGET_OBJECTS:${crt_name}> ${SYSROOT_LIB_DIR}/${crt_name}.o
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COMMAND_EXPAND_LISTS
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)
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add_custom_target(${crt_name}.o ALL
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DEPENDS ${CMAKE_BINARY_DIR}/sysroot/lib/${crt_name}.o)
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add_dependencies(${crt_name}.o ${crt_name})
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endforeach()

‎cmake/libc-bottom-half/getpid/CMakeLists.txt

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file(GLOB_RECURSE
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GETPID_SOURCES
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${LIBC_BOTTOM_HALF_DIR}/getpid/*.c)
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add_library(wasi-emulated-getpid STATIC
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${GETPID_SOURCES})
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set_target_properties(wasi-emulated-getpid
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PROPERTIES
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ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/sysroot/lib
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)
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add_dependencies(wasi-emulated-getpid sysroot-headers)
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add_custom_command(TARGET wasi-emulated-getpid POST_BUILD
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COMMAND ${CMAKE_C_COMPILER_AR} crs $<TARGET_FILE:c>
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)

‎cmake/libc-bottom-half/mman/CMakeLists.txt

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file(GLOB_RECURSE
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MMAN_SOURCES
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${LIBC_BOTTOM_HALF_DIR}/mman/*.c)
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add_library(wasi-emulated-mman STATIC
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${MMAN_SOURCES})
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add_dependencies(wasi-emulated-mman sysroot-headers)
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add_custom_command(TARGET wasi-emulated-mman POST_BUILD
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COMMAND ${CMAKE_C_COMPILER_AR} crs $<TARGET_FILE:c>
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)

‎cmake/libc-bottom-half/signal/CMakeLists.txt

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file(GLOB_RECURSE
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SIGNAL_SOURCES
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${LIBC_BOTTOM_HALF_DIR}/signal/*.c)
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add_library(wasi-emulated-signal-objs
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OBJECT
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${SIGNAL_SOURCES}
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)
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add_dependencies(wasi-emulated-signal-objs sysroot-headers)

‎cmake/libc-imports.cmake

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add_custom_command(OUTPUT ${SYSROOT_LIB_DIR}/libc.imports
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COMMAND
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${Python_EXECUTABLE} ${PROJECT_SOURCE_DIR}/tools/gen-imports.py
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--nm ${CMAKE_NM}
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--libc-imports-output ${SYSROOT_LIB_DIR}/libc.imports
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--defined-symbols-output ${SYSROOT_SHARE_DIR}/defined-symbols.txt
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--undefined-symbols-output ${SYSROOT_SHARE_DIR}/undefined-symbols.txt
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$<TARGET_FILE:c>
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$<TARGET_FILE:c-printscan-long-double>
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$<TARGET_FILE:c-printscan-no-floating-point>
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$<TARGET_FILE:wasi-emulated-mman>
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$<TARGET_FILE:wasi-emulated-process-clocks>
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$<TARGET_FILE:wasi-emulated-getpid>
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$<TARGET_FILE:wasi-emulated-signal>
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$<TARGET_OBJECTS:crt1>
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$<TARGET_OBJECTS:crt1-command>
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$<TARGET_OBJECTS:crt1-reactor>
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DEPENDS
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${PROJECT_SOURCE_DIR}/tools/gen-imports.py)
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add_custom_target(libc.imports ALL
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DEPENDS ${SYSROOT_LIB_DIR}/libc.imports)
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add_dependencies(libc.imports
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c
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c-printscan-long-double
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c-printscan-no-floating-point
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wasi-emulated-mman
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wasi-emulated-process-clocks
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wasi-emulated-getpid
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wasi-emulated-signal
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crt1
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crt1-command
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crt1-reactor
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)

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