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wasi-sdk-sysroot.cmake
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# Build logic for building a sysroot for wasi-sdk which includes compiler-rt,
# wasi-libc, libcxx, and libcxxabi.
if(NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE RelWithDebInfo)
endif()
find_program(MAKE make REQUIRED)
option(WASI_SDK_DEBUG_PREFIX_MAP "Pass `-fdebug-prefix-map` for built artifacts" ON)
option(WASI_SDK_INCLUDE_TESTS "Whether or not to build tests by default" OFF)
option(WASI_SDK_INSTALL_TO_CLANG_RESOURCE_DIR "Whether or not to modify the compiler's resource directory" OFF)
option(WASI_SDK_LTO "Whether or not to build LTO assets" ON)
set(wasi_tmp_install ${CMAKE_CURRENT_BINARY_DIR}/install)
set(wasi_sysroot ${wasi_tmp_install}/share/wasi-sysroot)
set(wasi_resource_dir ${wasi_tmp_install}/wasi-resource-dir)
if(WASI_SDK_DEBUG_PREFIX_MAP)
add_compile_options(
-fdebug-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=wasisdk://v${wasi_sdk_version})
endif()
# Default arguments for builds of cmake projects (mostly LLVM-based) to forward
# along much of our own configuration into these projects.
set(default_cmake_args
-DCMAKE_SYSTEM_NAME=WASI
-DCMAKE_SYSTEM_VERSION=1
-DCMAKE_SYSTEM_PROCESSOR=wasm32
-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
-DCMAKE_AR=${CMAKE_AR}
-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-DCMAKE_C_COMPILER_WORKS=ON
-DCMAKE_CXX_COMPILER_WORKS=ON
-DCMAKE_SYSROOT=${wasi_sysroot}
-DCMAKE_MODULE_PATH=${CMAKE_CURRENT_SOURCE_DIR}/cmake)
if(CMAKE_C_COMPILER_LAUNCHER)
list(APPEND default_cmake_args -DCMAKE_C_COMPILER_LAUNCHER=${CMAKE_C_COMPILER_LAUNCHER})
endif()
if(CMAKE_CXX_COMPILER_LAUNCHER)
list(APPEND default_cmake_args -DCMAKE_CXX_COMPILER_LAUNCHER=${CMAKE_CXX_COMPILER_LAUNCHER})
endif()
# =============================================================================
# compiler-rt build logic
# =============================================================================
ExternalProject_Add(compiler-rt-build
SOURCE_DIR "${llvm_proj_dir}/compiler-rt"
CMAKE_ARGS
${default_cmake_args}
-DCOMPILER_RT_BAREMETAL_BUILD=ON
-DCOMPILER_RT_BUILD_XRAY=OFF
-DCOMPILER_RT_INCLUDE_TESTS=OFF
-DCOMPILER_RT_HAS_FPIC_FLAG=OFF
-DCOMPILER_RT_ENABLE_IOS=OFF
-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
-DCMAKE_C_COMPILER_TARGET=wasm32-wasi
-DCOMPILER_RT_OS_DIR=wasi
-DCMAKE_INSTALL_PREFIX=${wasi_resource_dir}
EXCLUDE_FROM_ALL ON
USES_TERMINAL_CONFIGURE ON
USES_TERMINAL_BUILD ON
USES_TERMINAL_INSTALL ON
)
# In addition to the default installation of `compiler-rt` itself also copy
# around some headers and make copies of the `wasi` directory as `wasip1` and
# `wasip2`
execute_process(
COMMAND ${CMAKE_C_COMPILER} -print-resource-dir
OUTPUT_VARIABLE clang_resource_dir
OUTPUT_STRIP_TRAILING_WHITESPACE)
add_custom_target(compiler-rt-post-build
# The `${wasi_resource_dir}` folder is going to get used as `-resource-dir`
# for future compiles. Copy the host compiler's own headers into this
# directory to ensure that all host-defined headers all work as well.
COMMAND ${CMAKE_COMMAND} -E copy_directory
${clang_resource_dir}/include ${wasi_resource_dir}/include
# Copy the `lib/wasi` folder to `libc/wasi{p1,p2}` to ensure that those
# OS-strings also work for looking up the compiler-rt.a file.
COMMAND ${CMAKE_COMMAND} -E copy_directory
${wasi_resource_dir}/lib/wasi ${wasi_resource_dir}/lib/wasip1
COMMAND ${CMAKE_COMMAND} -E copy_directory
${wasi_resource_dir}/lib/wasi ${wasi_resource_dir}/lib/wasip2
COMMENT "finalizing compiler-rt installation"
)
add_dependencies(compiler-rt-post-build compiler-rt-build)
add_custom_target(compiler-rt DEPENDS compiler-rt-build compiler-rt-post-build)
# =============================================================================
# wasi-libc build logic
# =============================================================================
function(define_wasi_libc_sub target target_suffix lto)
set(build_dir ${CMAKE_CURRENT_BINARY_DIR}/wasi-libc-${target}${target_suffix})
if(${target} MATCHES threads)
if(lto)
set(extra_make_flags LTO=full THREAD_MODEL=posix)
else()
set(extra_make_flags THREAD_MODEL=posix)
endif()
elseif(${target} MATCHES p2)
if(lto)
set(extra_make_flags LTO=full WASI_SNAPSHOT=p2 default)
else()
set(extra_make_flags WASI_SNAPSHOT=p2 default libc_so)
endif()
else()
if(lto)
set(extra_make_flags LTO=full default)
else()
set(extra_make_flags default libc_so)
endif()
endif()
string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UPPER)
get_property(directory_cflags DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY COMPILE_OPTIONS)
set(extra_cflags_list
"${CMAKE_C_FLAGS} ${directory_cflags} ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_UPPER}}")
list(JOIN extra_cflags_list " " extra_cflags)
ExternalProject_Add(wasi-libc-${target}${target_suffix}-build
# Currently wasi-libc doesn't support out-of-tree builds so feigh a
# "download command" which copies the source tree to a different location
# so out-of-tree builds are supported.
DOWNLOAD_COMMAND
${CMAKE_COMMAND} -E copy_directory ${wasi_libc} ${build_dir}
SOURCE_DIR "${build_dir}"
CONFIGURE_COMMAND ""
BUILD_COMMAND
${MAKE} -j8 -C ${build_dir}
CC=${CMAKE_C_COMPILER}
AR=${CMAKE_AR}
NM=${CMAKE_NM}
SYSROOT=${wasi_sysroot}
EXTRA_CFLAGS=${extra_cflags}
TARGET_TRIPLE=${target}
${extra_make_flags}
INSTALL_COMMAND ""
DEPENDS compiler-rt
EXCLUDE_FROM_ALL ON
USES_TERMINAL_CONFIGURE ON
USES_TERMINAL_BUILD ON
USES_TERMINAL_INSTALL ON
)
endfunction()
function(define_wasi_libc target)
define_wasi_libc_sub (${target} "" OFF)
if(WASI_SDK_LTO)
define_wasi_libc_sub (${target} "-lto" ON)
endif()
add_custom_target(wasi-libc-${target}
DEPENDS wasi-libc-${target}-build $<$<BOOL:${WASI_SDK_LTO}>:wasi-libc-${target}-lto-build>)
endfunction()
foreach(target IN LISTS WASI_SDK_TARGETS)
define_wasi_libc(${target})
endforeach()
# =============================================================================
# libcxx build logic
# =============================================================================
execute_process(
COMMAND ${CMAKE_C_COMPILER} -dumpversion
OUTPUT_VARIABLE llvm_version
OUTPUT_STRIP_TRAILING_WHITESPACE)
function(define_libcxx_sub target target_suffix extra_target_flags extra_libdir_suffix)
if(${target} MATCHES threads)
set(threads ON)
set(pic OFF)
set(target_flags -pthread)
else()
set(threads OFF)
set(pic ON)
set(target_flags "")
endif()
if(${target_suffix} MATCHES lto)
set(pic OFF)
endif()
list(APPEND target_flags ${extra_target_flags})
set(runtimes "libcxx;libcxxabi")
get_property(dir_compile_opts DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY COMPILE_OPTIONS)
get_property(dir_link_opts DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY LINK_OPTIONS)
set(extra_flags
${target_flags}
--target=${target}
${dir_compile_opts}
${dir_link_opts}
--sysroot ${wasi_sysroot}
-resource-dir ${wasi_resource_dir})
set(extra_cflags_list ${CMAKE_C_FLAGS} ${extra_flags})
list(JOIN extra_cflags_list " " extra_cflags)
set(extra_cxxflags_list ${CMAKE_CXX_FLAGS} ${extra_flags})
list(JOIN extra_cxxflags_list " " extra_cxxflags)
ExternalProject_Add(libcxx-${target}${target_suffix}-build
SOURCE_DIR ${llvm_proj_dir}/runtimes
CMAKE_ARGS
${default_cmake_args}
# Ensure headers are installed in a target-specific path instead of a
# target-generic path.
-DCMAKE_INSTALL_INCLUDEDIR=${wasi_sysroot}/include/${target}
-DCMAKE_STAGING_PREFIX=${wasi_sysroot}
-DCMAKE_POSITION_INDEPENDENT_CODE=${pic}
-DCXX_SUPPORTS_CXX11=ON
-DLIBCXX_ENABLE_THREADS:BOOL=${threads}
-DLIBCXX_HAS_PTHREAD_API:BOOL=${threads}
-DLIBCXX_HAS_EXTERNAL_THREAD_API:BOOL=OFF
-DLIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY:BOOL=OFF
-DLIBCXX_HAS_WIN32_THREAD_API:BOOL=OFF
-DLLVM_COMPILER_CHECKED=ON
-DLIBCXX_ENABLE_SHARED:BOOL=${pic}
-DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY:BOOL=OFF
-DLIBCXX_ENABLE_EXCEPTIONS:BOOL=OFF
-DLIBCXX_ENABLE_FILESYSTEM:BOOL=ON
-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT:BOOL=OFF
-DLIBCXX_CXX_ABI=libcxxabi
-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${llvm_proj_dir}/libcxxabi/include
-DLIBCXX_HAS_MUSL_LIBC:BOOL=ON
-DLIBCXX_ABI_VERSION=2
-DLIBCXXABI_ENABLE_EXCEPTIONS:BOOL=OFF
-DLIBCXXABI_ENABLE_SHARED:BOOL=${pic}
-DLIBCXXABI_SILENT_TERMINATE:BOOL=ON
-DLIBCXXABI_ENABLE_THREADS:BOOL=${threads}
-DLIBCXXABI_HAS_PTHREAD_API:BOOL=${threads}
-DLIBCXXABI_HAS_EXTERNAL_THREAD_API:BOOL=OFF
-DLIBCXXABI_BUILD_EXTERNAL_THREAD_LIBRARY:BOOL=OFF
-DLIBCXXABI_HAS_WIN32_THREAD_API:BOOL=OFF
-DLIBCXXABI_ENABLE_PIC:BOOL=${pic}
-DLIBCXXABI_USE_LLVM_UNWINDER:BOOL=OFF
-DUNIX:BOOL=ON
-DCMAKE_C_FLAGS=${extra_cflags}
-DCMAKE_CXX_FLAGS=${extra_cxxflags}
-DLIBCXX_LIBDIR_SUFFIX=/${target}${extra_libdir_suffix}
-DLIBCXXABI_LIBDIR_SUFFIX=/${target}${extra_libdir_suffix}
# See https://www.scivision.dev/cmake-externalproject-list-arguments/ for
# why this is in `CMAKE_CACHE_ARGS` instead of above
CMAKE_CACHE_ARGS
-DLLVM_ENABLE_RUNTIMES:STRING=${runtimes}
DEPENDS
wasi-libc-${target}
compiler-rt
EXCLUDE_FROM_ALL ON
USES_TERMINAL_CONFIGURE ON
USES_TERMINAL_BUILD ON
USES_TERMINAL_INSTALL ON
)
endfunction()
function(define_libcxx target)
define_libcxx_sub(${target} "" "" "")
if(WASI_SDK_LTO)
# Note: clang knows this /llvm-lto/${llvm_version} convention.
# https://github.com/llvm/llvm-project/blob/llvmorg-18.1.8/clang/lib/Driver/ToolChains/WebAssembly.cpp#L204-L210
define_libcxx_sub(${target} "-lto" "-flto=full" "/llvm-lto/${llvm_version}")
endif()
# As of this writing, `clang++` will ignore the target-specific include dirs
# unless this one also exists:
add_custom_target(libcxx-${target}-extra-dir
COMMAND ${CMAKE_COMMAND} -E make_directory ${wasi_sysroot}/include/c++/v1
COMMENT "creating libcxx-specific header file folder")
add_custom_target(libcxx-${target}
DEPENDS libcxx-${target}-build $<$<BOOL:${WASI_SDK_LTO}>:libcxx-${target}-lto-build> libcxx-${target}-extra-dir)
endfunction()
foreach(target IN LISTS WASI_SDK_TARGETS)
define_libcxx(${target})
endforeach()
# =============================================================================
# misc build logic
# =============================================================================
install(DIRECTORY ${wasi_tmp_install}/share
USE_SOURCE_PERMISSIONS
DESTINATION ${CMAKE_INSTALL_PREFIX})
if(WASI_SDK_INSTALL_TO_CLANG_RESOURCE_DIR)
install(DIRECTORY ${wasi_resource_dir}/lib
USE_SOURCE_PERMISSIONS
DESTINATION ${clang_resource_dir})
else()
install(DIRECTORY ${wasi_resource_dir}/lib
USE_SOURCE_PERMISSIONS
DESTINATION ${CMAKE_INSTALL_PREFIX}/clang-resource-dir)
endif()
# Add a top-level `build` target as well as `build-$target` targets.
add_custom_target(build ALL)
foreach(target IN LISTS WASI_SDK_TARGETS)
add_custom_target(build-${target})
add_dependencies(build-${target} libcxx-${target} wasi-libc-${target} compiler-rt)
add_dependencies(build build-${target})
endforeach()
# Install a `VERSION` file in the output prefix with a dump of version
# information.
execute_process(
COMMAND ${PYTHON} ${version_script} dump
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
OUTPUT_VARIABLE version_dump)
set(version_file_tmp ${CMAKE_CURRENT_BINARY_DIR}/VERSION)
file(GENERATE OUTPUT ${version_file_tmp} CONTENT ${version_dump})
add_custom_target(version-file DEPENDS ${version_file_tmp})
add_dependencies(build version-file)
install(FILES ${version_file_tmp}
DESTINATION ${CMAKE_INSTALL_PREFIX})
if(WASI_SDK_INCLUDE_TESTS)
add_subdirectory(tests)
endif()
include(wasi-sdk-dist)
set(dist_dir ${CMAKE_CURRENT_BINARY_DIR}/dist)
# Tarball with just `compiler-rt` builtins within it
wasi_sdk_add_tarball(dist-compiler-rt
${dist_dir}/libclang_rt.builtins-wasm32-wasi-${wasi_sdk_version}.tar.gz
${wasi_resource_dir}/lib/wasi)
add_dependencies(dist-compiler-rt compiler-rt)
# Tarball with the whole sysroot
wasi_sdk_add_tarball(dist-sysroot
${dist_dir}/wasi-sysroot-${wasi_sdk_version}.tar.gz
${wasi_tmp_install}/share/wasi-sysroot)
add_dependencies(dist-sysroot build)
add_custom_target(dist DEPENDS dist-compiler-rt dist-sysroot)