web-wasi-emulated-threads: initial addition

Todos: - Add to CI if possible (builds LLVM/Clang) - Add to README
2025-03-12 17:20:08 +01:00 · 2025-01-22 16:26:14 -05:00 · 2025-01-22 16:26:14 -05:00 · c0efd5bf10
commit c0efd5bf10
parent 1d459d9fbc
13 changed files with 462 additions and 5 deletions
--- a/6
+++ b/6
@ -52,7 +52,7 @@ GEN_IMAGES := android-arm android-arm64 \
 	manylinux_2_28-x64 \
 	manylinux2014-x64 manylinux2014-x86 \
 	manylinux2014-aarch64 linux-arm64-lts \
-	web-wasm web-wasi web-wasi-threads linux-mips linux-mips-uclibc linux-mips-lts windows-arm64 windows-armv7 \
+	web-wasm web-wasi web-wasi-emulated-threads web-wasi-threads linux-mips linux-mips-uclibc linux-mips-lts windows-arm64 windows-armv7 \
 	windows-static-x86 windows-static-x64 windows-static-x64-posix \
 	windows-shared-x86 windows-shared-x64 windows-shared-x64-posix \
 	linux-armv7 linux-armv7a linux-armv7l-musl linux-armv7-lts linux-armv7a-lts linux-x86_64-full \
@ -63,13 +63,13 @@ GEN_IMAGES := android-arm android-arm64 \

 # Generate both amd64 and arm64 images
 MULTIARCH_IMAGES :=  linux-arm64 \
-	web-wasi
+	web-wasi web-wasi-emulated-threads

 GEN_IMAGE_DOCKERFILES = $(addsuffix /Dockerfile,$(GEN_IMAGES))

 # These images are expected to have explicit rules for *both* build and testing
 NON_STANDARD_IMAGES := manylinux_2_28-x64 manylinux2014-x64 manylinux2014-x86 \
-		      manylinux2014-aarch64 web-wasm web-wasi-threads
+		      manylinux2014-aarch64 web-wasm web-wasi-emulated-threads web-wasi-threads

 # Docker composite files
 DOCKER_COMPOSITE_SOURCES = common.docker common.debian common.manylinux2014 common.manylinux_2_28 common.buildroot \
--- a/common/common.webassembly
+++ b/common/common.webassembly
@ -43,10 +43,10 @@ RUN git clone --recurse-submodules https://github.com/WebAssembly/wabt.git && \
  cd ../ && \
  rm -rf wabt*

-RUN mkdir /wasi-runtimes
+RUN mkdir -p /wasi-runtimes

 ENV WASMTIME_HOME=/wasi-runtimes/wasmtime
-RUN mkdir ${WASMTIME_HOME} && curl https://wasmtime.dev/install.sh -sSf | bash
+RUN mkdir -p ${WASMTIME_HOME} && curl https://wasmtime.dev/install.sh -sSf | bash
 COPY imagefiles/wasmtime-pwd.sh ${WASMTIME_HOME}/bin/
 COPY imagefiles/wasmtime-pwd-threads.sh ${WASMTIME_HOME}/bin/
 ENV PATH="$WASMTIME_HOME/bin:$PATH"
--- a/web-wasi-emulated-threads/CheckTypeSize.c.in
+++ b/web-wasi-emulated-threads/CheckTypeSize.c.in
@ -0,0 +1,37 @@
+@headers@
+
+#undef KEY
+#if defined(__i386)
+# define KEY '_','_','i','3','8','6'
+#elif defined(__x86_64)
+# define KEY '_','_','x','8','6','_','6','4'
+#elif defined(__ppc__)
+# define KEY '_','_','p','p','c','_','_'
+#elif defined(__ppc64__)
+# define KEY '_','_','p','p','c','6','4','_','_'
+#endif
+
+#define SIZE (sizeof(@type@))
+char info_size[] =  {'I', 'N', 'F', 'O', ':', 's','i','z','e','[',
+  ('0' + ((SIZE / 10000)%10)),
+  ('0' + ((SIZE / 1000)%10)),
+  ('0' + ((SIZE / 100)%10)),
+  ('0' + ((SIZE / 10)%10)),
+  ('0' +  (SIZE    % 10)),
+  ']',
+#ifdef KEY
+  ' ','k','e','y','[', KEY, ']',
+#endif
+  '\0'};
+
+#ifdef __CLASSIC_C__
+int main(argc, argv) int argc; char *argv[];
+#else
+int main(int argc, char *argv[])
+#endif
+{
+  int require = 0;
+  require += info_size[argc];
+  (void)argv;
+  return SIZE;
+}
--- a/web-wasi-emulated-threads/CheckTypeSize.cmake
+++ b/web-wasi-emulated-threads/CheckTypeSize.cmake
@ -0,0 +1,231 @@
+#.rst:
+# CheckTypeSize
+# -------------
+#
+# Check sizeof a type
+#
+# ::
+#
+#   CHECK_TYPE_SIZE(TYPE VARIABLE [BUILTIN_TYPES_ONLY]
+#                                 [LANGUAGE <language>])
+#
+# Check if the type exists and determine its size.  On return,
+# "HAVE_${VARIABLE}" holds the existence of the type, and "${VARIABLE}"
+# holds one of the following:
+#
+# ::
+#
+#    <size> = type has non-zero size <size>
+#    "0"    = type has arch-dependent size (see below)
+#    ""     = type does not exist
+#
+# Both ``HAVE_${VARIABLE}`` and ``${VARIABLE}`` will be created as internal
+# cache variables.
+#
+# Furthermore, the variable "${VARIABLE}_CODE" holds C preprocessor code
+# to define the macro "${VARIABLE}" to the size of the type, or leave
+# the macro undefined if the type does not exist.
+#
+# The variable "${VARIABLE}" may be "0" when CMAKE_OSX_ARCHITECTURES has
+# multiple architectures for building OS X universal binaries.  This
+# indicates that the type size varies across architectures.  In this
+# case "${VARIABLE}_CODE" contains C preprocessor tests mapping from
+# each architecture macro to the corresponding type size.  The list of
+# architecture macros is stored in "${VARIABLE}_KEYS", and the value for
+# each key is stored in "${VARIABLE}-${KEY}".
+#
+# If the BUILTIN_TYPES_ONLY option is not given, the macro checks for
+# headers <sys/types.h>, <stdint.h>, and <stddef.h>, and saves results
+# in HAVE_SYS_TYPES_H, HAVE_STDINT_H, and HAVE_STDDEF_H.  The type size
+# check automatically includes the available headers, thus supporting
+# checks of types defined in the headers.
+#
+# If LANGUAGE is set, the specified compiler will be used to perform the
+# check. Acceptable values are C and CXX
+#
+# Despite the name of the macro you may use it to check the size of more
+# complex expressions, too.  To check e.g.  for the size of a struct
+# member you can do something like this:
+#
+# ::
+#
+#   check_type_size("((struct something*)0)->member" SIZEOF_MEMBER)
+#
+#
+#
+# The following variables may be set before calling this macro to modify
+# the way the check is run:
+#
+# ::
+#
+#   CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#   CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#   CMAKE_REQUIRED_INCLUDES = list of include directories
+#   CMAKE_REQUIRED_LIBRARIES = list of libraries to link
+#   CMAKE_REQUIRED_QUIET = execute quietly without messages
+#   CMAKE_EXTRA_INCLUDE_FILES = list of extra headers to include
+
+#=============================================================================
+# Copyright 2002-2009 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+include(CheckIncludeFile)
+include(CheckIncludeFileCXX)
+
+cmake_policy(PUSH)
+cmake_policy(VERSION 3.0)
+
+get_filename_component(__check_type_size_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)
+
+#-----------------------------------------------------------------------------
+# Helper function.  DO NOT CALL DIRECTLY.
+function(__check_type_size_impl type var map builtin language)
+  if(NOT CMAKE_REQUIRED_QUIET)
+    message(STATUS "Check size of ${type}")
+  endif()
+
+  # Include header files.
+  set(headers)
+  if(builtin)
+    if(HAVE_SYS_TYPES_H)
+      set(headers "${headers}#include <sys/types.h>\n")
+    endif()
+    if(HAVE_STDINT_H)
+      set(headers "${headers}#include <stdint.h>\n")
+    endif()
+    if(HAVE_STDDEF_H)
+      set(headers "${headers}#include <stddef.h>\n")
+    endif()
+  endif()
+  foreach(h ${CMAKE_EXTRA_INCLUDE_FILES})
+    set(headers "${headers}#include \"${h}\"\n")
+  endforeach()
+
+  # Perform the check.
+
+  if("${language}" STREQUAL "C")
+    set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.c)
+  elseif("${language}" STREQUAL "CXX")
+    set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.cpp)
+  else()
+    message(FATAL_ERROR "Unknown language:\n  ${language}\nSupported languages: C, CXX.\n")
+  endif()
+  set(bin ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.bin)
+  configure_file(${__check_type_size_dir}/CheckTypeSize.c.in ${src} @ONLY)
+  try_run(${var}_run_result HAVE_${var} ${CMAKE_BINARY_DIR} ${src}
+    COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+    LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}
+    CMAKE_FLAGS
+      "-DCOMPILE_DEFINITIONS:STRING=${CMAKE_REQUIRED_FLAGS}"
+      "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}"
+    RUN_OUTPUT_VARIABLE ${var}_run_output
+    COMPILE_OUTPUT_VARIABLE output
+    )
+
+  if(${HAVE_${var}} AND NOT "${${var}_run_result}" STREQUAL "FAILED_TO_RUN")
+    set(${var} ${${var}_run_result})
+    if(NOT CMAKE_REQUIRED_QUIET)
+      message(STATUS "Check size of ${type} - done")
+    endif()
+    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+      "Determining size of ${type} passed with the following output:\n${output}\n\n")
+    set(${var} "${${var}}" CACHE INTERNAL "CHECK_TYPE_SIZE: sizeof(${type})")
+  else()
+    # The check failed to compile.
+    if(NOT CMAKE_REQUIRED_QUIET)
+      message(STATUS "Check size of ${type} - failed")
+    endif()
+    file(READ ${src} content)
+    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+      "Determining size of ${type} failed with the following output:\n${output}\n${src}:\n${content}\n\n")
+    set(${var} "" CACHE INTERNAL "CHECK_TYPE_SIZE: ${type} unknown")
+    file(REMOVE ${map})
+  endif()
+endfunction()
+
+#-----------------------------------------------------------------------------
+macro(CHECK_TYPE_SIZE TYPE VARIABLE)
+  # parse arguments
+  unset(doing)
+  foreach(arg ${ARGN})
+    if("x${arg}" STREQUAL "xBUILTIN_TYPES_ONLY")
+      set(_CHECK_TYPE_SIZE_${arg} 1)
+      unset(doing)
+    elseif("x${arg}" STREQUAL "xLANGUAGE") # change to MATCHES for more keys
+      set(doing "${arg}")
+      set(_CHECK_TYPE_SIZE_${doing} "")
+    elseif("x${doing}" STREQUAL "xLANGUAGE")
+      set(_CHECK_TYPE_SIZE_${doing} "${arg}")
+      unset(doing)
+    else()
+      message(FATAL_ERROR "Unknown argument:\n  ${arg}\n")
+    endif()
+  endforeach()
+  if("x${doing}" MATCHES "^x(LANGUAGE)$")
+    message(FATAL_ERROR "Missing argument:\n  ${doing} arguments requires a value\n")
+  endif()
+  if(DEFINED _CHECK_TYPE_SIZE_LANGUAGE)
+    if(NOT "x${_CHECK_TYPE_SIZE_LANGUAGE}" MATCHES "^x(C|CXX)$")
+      message(FATAL_ERROR "Unknown language:\n  ${_CHECK_TYPE_SIZE_LANGUAGE}.\nSupported languages: C, CXX.\n")
+    endif()
+    set(_language ${_CHECK_TYPE_SIZE_LANGUAGE})
+  else()
+    set(_language C)
+  endif()
+
+  # Optionally check for standard headers.
+  if(_CHECK_TYPE_SIZE_BUILTIN_TYPES_ONLY)
+    set(_builtin 0)
+  else()
+    set(_builtin 1)
+    if("${_language}" STREQUAL "C")
+      check_include_file(sys/types.h HAVE_SYS_TYPES_H)
+      check_include_file(stdint.h HAVE_STDINT_H)
+      check_include_file(stddef.h HAVE_STDDEF_H)
+    elseif("${_language}" STREQUAL "CXX")
+      check_include_file_cxx(sys/types.h HAVE_SYS_TYPES_H)
+      check_include_file_cxx(stdint.h HAVE_STDINT_H)
+      check_include_file_cxx(stddef.h HAVE_STDDEF_H)
+    endif()
+  endif()
+  unset(_CHECK_TYPE_SIZE_BUILTIN_TYPES_ONLY)
+  unset(_CHECK_TYPE_SIZE_LANGUAGE)
+
+  # Compute or load the size or size map.
+  set(${VARIABLE}_KEYS)
+  set(_map_file ${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${VARIABLE}.cmake)
+  if(NOT DEFINED HAVE_${VARIABLE})
+    __check_type_size_impl(${TYPE} ${VARIABLE} ${_map_file} ${_builtin} ${_language})
+  endif()
+  include(${_map_file} OPTIONAL)
+  set(_map_file)
+  set(_builtin)
+
+  # Create preprocessor code.
+  if(${VARIABLE}_KEYS)
+    set(${VARIABLE}_CODE)
+    set(_if if)
+    foreach(key ${${VARIABLE}_KEYS})
+      set(${VARIABLE}_CODE "${${VARIABLE}_CODE}#${_if} defined(${key})\n# define ${VARIABLE} ${${VARIABLE}-${key}}\n")
+      set(_if elif)
+    endforeach()
+    set(${VARIABLE}_CODE "${${VARIABLE}_CODE}#else\n# error ${VARIABLE} unknown\n#endif")
+    set(_if)
+  elseif(${VARIABLE})
+    set(${VARIABLE}_CODE "#define ${VARIABLE} ${${VARIABLE}}")
+  else()
+    set(${VARIABLE}_CODE "/* #undef ${VARIABLE} */")
+  endif()
+endmacro()
+
+#-----------------------------------------------------------------------------
+cmake_policy(POP)
--- a/web-wasi-emulated-threads/Dockerfile.in
+++ b/web-wasi-emulated-threads/Dockerfile.in
@ -0,0 +1,42 @@
+ARG ORG=dockcross
+ARG HOST_ARCH=amd64
+FROM ${ORG}/base:latest-${HOST_ARCH}
+
+LABEL maintainer="Matt McCormick matt@mmmccormick.com"
+
+ENV LLVM_VERSION=19
+ENV WASI_VERSION=25
+ENV WASI_VERSION_FULL=${WASI_VERSION}.0
+
+ENV WASMTIME_HOME=/wasi-runtimes/wasmtime
+RUN mkdir -p ${WASMTIME_HOME} && curl https://wasmtime.dev/install.sh -sSf | bash
+ENV PATH="$WASMTIME_HOME/bin:$PATH"
+
+COPY download-build-install-wasi-sdk.sh /usr/local/bin/
+RUN /usr/local/bin/download-build-install-wasi-sdk.sh
+
+ENV WASI_SYSROOT=/opt/wasi-sdk/share/wasi-sysroot
+ENV WASI_SDK_PATH=/opt/wasi-sdk
+
+COPY clang-wasi-sysroot.sh clang++-wasi-sysroot.sh /usr/local/bin/
+
+ENV CROSS_TRIPLE=wasm32-wasi
+ENV CROSS_ROOT=${WASI_SDK_PATH}
+ENV AR=${WASI_SDK_PATH}/bin/llvm-ar \
+    CC=clang-wasi-sysroot.sh \
+    CXX=clang++-wasi-sysroot.sh \
+    LD=${WASI_SDK_PATH}/bin/wasm-ld \
+    RANLIB=${WASI_SDK_PATH}/bin/llvm-ranlib
+
+#include "common.webassembly"
+
+COPY WASI.cmake /usr/src/
+RUN mv /usr/src/WASI.cmake /usr/share/cmake-*/Modules/Platform/
+COPY *.cmake /usr/src/
+RUN mv /usr/src/*.cmake /usr/share/cmake-*/Modules/
+COPY CheckTypeSize.c.in /usr/src/
+RUN mv /usr/src/CheckTypeSize.c.in /usr/share/cmake-*/Modules/
+COPY Toolchain.cmake ${CROSS_ROOT}/
+ENV CMAKE_TOOLCHAIN_FILE=${CROSS_ROOT}/Toolchain.cmake
+
+#include "common.label-and-env"
--- a/web-wasi-emulated-threads/FindOpenAL.cmake
+++ b/web-wasi-emulated-threads/FindOpenAL.cmake
@ -0,0 +1,25 @@
+# Locate OpenAL
+# This module defines
+# OPENAL_LIBRARY
+# OPENAL_FOUND, if false, do not try to link to OpenAL
+# OPENAL_INCLUDE_DIR, where to find the headers
+
+# The implementation is based on the standard FindOpenAL.cmake provided with CMake,
+# but customized for targeting Emscripten only.
+
+if (NOT OPENAL_FOUND)
+	SET(OPENAL_FOUND TRUE)
+
+	# For Emscripten-compiled apps in the test suite (test_alut), this is expected...
+	SET(OPENAL_INCLUDE_DIR "${EMSCRIPTEN_ROOT_PATH}/system/include")
+	# ... but the stock FindOpenAL.cmake would have returned this.
+	#SET(OPENAL_INCLUDE_DIR "${EMSCRIPTEN_ROOT_PATH}/system/include/AL")
+
+	# Returning "-lopenal" is now considered mandatory
+	SET(OPENAL_LIBRARY "-lopenal")
+	SET(OPENAL_LIB "-lopenal")
+
+	set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "${EMSCRIPTEN_ROOT_PATH}/system/include" "${EMSCRIPTEN_ROOT_PATH}/system/include/AL")
+
+	MARK_AS_ADVANCED(OPENAL_LIBRARY OPENAL_INCLUDE_DIR)
+endif()
--- a/web-wasi-emulated-threads/FindOpenGL.cmake
+++ b/web-wasi-emulated-threads/FindOpenGL.cmake
@ -0,0 +1,34 @@
+# Locate OpenGL
+# This module defines:
+# OPENGL_FOUND       - system has OpenGL
+# OPENGL_XMESA_FOUND - system has XMESA
+# OPENGL_GLU_FOUND   - system has GLU
+# OPENGL_INCLUDE_DIR - the GL include directory
+# OPENGL_LIBRARIES   - Link these to use OpenGL and GLU
+# OPENGL_gl_LIBRARY  - Path to OpenGL Library
+# OPENGL_glu_LIBRARY - Path to GLU Library
+
+# The implementation is based on the standard FindOpenGL.cmake provided with CMake,
+# but customized for targeting Emscripten only.
+
+# These libraries are provided with Emscripten
+SET(OPENGL_FOUND TRUE)
+SET(OPENGL_GLU_FOUND TRUE)
+
+# Doesn't look like this one is part of Emscripten
+SET(OPENGL_XMESA_FOUND FALSE)
+
+# This is the path where <GL/gl.h> is found
+SET(OPENGL_INCLUDE_DIR "${EMSCRIPTEN_ROOT_PATH}/system/include")
+
+# No library to link against for OpenGL, since Emscripten picks it up automatically from library_webgl.js,
+# but need to report something, or CMake thinks we failed in the search.
+SET(OPENGL_LIBRARIES "nul")
+SET(OPENGL_gl_LIBRARY "nul")
+SET(OPENGL_glu_LIBRARY "nul")
+
+mark_as_advanced(
+  OPENGL_INCLUDE_DIR
+  OPENGL_glu_LIBRARY
+  OPENGL_gl_LIBRARY
+)
--- a/web-wasi-emulated-threads/TestBigEndian.cmake
+++ b/web-wasi-emulated-threads/TestBigEndian.cmake
@ -0,0 +1,30 @@
+#.rst:
+# TestBigEndian
+# -------------
+#
+# The TestBigEndian.cmake module that ships with CMake, which
+# checks if the system is big endian or little endian, assumes
+# that a binary is produced that will have bytes that correspond to the
+# endianness on the target system. Since emscripten produces Javascript, we
+# override the default behavior and always return little endian.
+#
+# ::
+#
+#   TEST_BIG_ENDIAN(VARIABLE)
+#   VARIABLE - variable to store the result to
+#=============================================================================
+# Copyright 2002-2009 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+function(TEST_BIG_ENDIAN VARIABLE)
+  set(${VARIABLE} 0 CACHE INTERNAL "Result of TEST_BIG_ENDIAN" FORCE)
+endfunction()
--- a/web-wasi-emulated-threads/Toolchain.cmake
+++ b/web-wasi-emulated-threads/Toolchain.cmake
@ -0,0 +1,14 @@
+set(WASI_SDK_PREFIX $ENV{WASI_SDK_PATH})
+include($ENV{WASI_SDK_PATH}/share/cmake/wasi-sdk.cmake)
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_WASI_EMULATED_PTHREAD")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_WASI_EMULATED_PTHREAD")
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lwasi-emulated-pthread")
+
+set(CMAKE_FIND_ROOT_PATH $ENV{CROSS_ROOT})
+set(CMAKE_SYSROOT $ENV{WASI_SYSROOT})
+
+set(CMAKE_C_COMPILER /usr/local/bin/clang-wasi-sysroot.sh)
+set(CMAKE_CXX_COMPILER /usr/local/bin/clang++-wasi-sysroot.sh)
+
+set(CMAKE_CROSSCOMPILING_EMULATOR /wasi-runtimes/wasmtime/bin/wasmtime-pwd.sh)
--- a/web-wasi-emulated-threads/WASI.cmake
+++ b/web-wasi-emulated-threads/WASI.cmake
@ -0,0 +1,2 @@
+set(WASI 1)
+set(UNIX 1)
--- a/web-wasi-emulated-threads/clang++-wasi-sysroot.sh
+++ b/web-wasi-emulated-threads/clang++-wasi-sysroot.sh
@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+exec ${WASI_SDK_PATH}/bin/clang++ -D_WASI_EMULATED_PTHREAD --target=wasm32-wasi --sysroot=${WASI_SYSROOT} "$@"
--- a/web-wasi-emulated-threads/clang-wasi-sysroot.sh
+++ b/web-wasi-emulated-threads/clang-wasi-sysroot.sh
@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+exec ${WASI_SDK_PATH}/bin/clang -D_WASI_EMULATED_PTHREAD --target=wasm32-wasi --sysroot=${WASI_SYSROOT} "$@"
--- a/web-wasi-emulated-threads/download-build-install-wasi-sdk.sh
+++ b/web-wasi-emulated-threads/download-build-install-wasi-sdk.sh
@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+set -eox pipefail
+
+mkdir /tmp/dl
+cd /tmp/dl
+
+wasi_sdk_dir=/opt/wasi-sdk
+mkdir -p $wasi_sdk_dir
+
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+export PATH=$HOME/.cargo/bin:$PATH
+
+git clone --recurse-submodules -b enable-libcxx-threads https://github.com/thewtex/wasi-sdk
+cd wasi-sdk
+git fetch origin --tags
+git remote add upstream https://github.com/WebAssembly/wasi-sdk
+git fetch upstream wasi-sdk-${WASI_VERSION}
+
+./ci/build.sh
+cd build/dist
+tar xzf wasi-toolchain-*.tar.gz --strip-components=1 -C /opt/wasi-sdk
+mkdir -p /opt/wasi-sdk/share/wasi-sysroot
+tar xzf wasi-sysroot-*.tar.gz --strip-components=1 -C /opt/wasi-sdk/share/wasi-sysroot
+for wasi_toolchain in wasi wasip1 wasip2; do
+  libclang_rt_out_dir=/opt/wasi-sdk/lib/clang/${LLVM_VERSION}/${wasi_toolchain}
+  mkdir -p $libclang_rt_out_dir
+  tar xzf ./libclang_rt.builtins-*.tar.gz --strip-components=1 -C $libclang_rt_out_dir
+done
+mkdir -p /opt/wasi-sdk/lib/clang/${LLVM_VERSION}/lib/wasm32-unknown-wasi
+cp ${libclang_rt_out_dir}/libclang_rt.builtins-wasm32.a /opt/wasi-sdk/lib/clang/${LLVM_VERSION}/lib/wasm32-unknown-wasi/libclang_rt.builtins.a
+
+cd /tmp/
+rm -rf /tmp/dl
+rm -rf $HOME/.cargo
+