From 00c89d2612cac66fc791a2355098c58100f86ed3 Mon Sep 17 00:00:00 2001
From: Sy Brand <sy.brand@fastly.com>
Date: Tue, 3 Mar 2026 13:38:45 +0000
Subject: [PATCH] WIP

---
 CMakeLists.txt                 |  2 +-
 cmake/wasi-sdk-sysroot.cmake   | 21 ++++-------------
 cmake/wasi-sdk-toolchain.cmake | 43 ++++++++++++++++++++++++----------
 src/llvm-project               |  2 +-
 src/wasi-libc                  |  2 +-
 5 files changed, 39 insertions(+), 31 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a0d3fca..97d97cb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,7 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 project(wasi-sdk)
 include(ExternalProject)
 
-set(WASI_SDK_TARGETS "wasm32-wasi;wasm32-wasip1;wasm32-wasip2;wasm32-wasip1-threads;wasm32-wasi-threads"
+set(WASI_SDK_TARGETS "wasm32-wasip3"
   CACHE STRING "List of WASI targets to build")
 option(WASI_SDK_BUILD_TOOLCHAIN "Build a toolchain instead of the sysroot" OFF)
 
diff --git a/cmake/wasi-sdk-sysroot.cmake b/cmake/wasi-sdk-sysroot.cmake
index 5bd04bb..4e98db8 100644
--- a/cmake/wasi-sdk-sysroot.cmake
+++ b/cmake/wasi-sdk-sysroot.cmake
@@ -23,7 +23,7 @@ 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)
+option(WASI_SDK_LTO "Whether or not to build LTO assets" OFF)
 set(WASI_SDK_CPU_CFLAGS "-mcpu=lime1" CACHE STRING "CFLAGS to specify wasm features to enable")
 
 set(wasi_tmp_install ${CMAKE_CURRENT_BINARY_DIR}/install)
@@ -98,8 +98,7 @@ function(define_compiler_rt target)
   add_dependencies(compiler-rt-build compiler-rt-build-${target})
 endfunction()
 
-define_compiler_rt(wasm32-wasi)
-define_compiler_rt(wasm32-wasip1-threads)
+define_compiler_rt(wasm32-wasip3)
 
 # 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
@@ -115,16 +114,6 @@ add_custom_target(compiler-rt-post-build
   COMMAND ${CMAKE_COMMAND} -E copy_directory
     ${clang_resource_dir}/include ${wasi_resource_dir}/include
 
-  # Copy the `lib/wasm32-unknown-wasi` folder to `lib/wasm32-unknown-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/wasm32-unknown-wasi ${wasi_resource_dir}/lib/wasm32-unknown-wasip1
-  COMMAND ${CMAKE_COMMAND} -E copy_directory
-    ${wasi_resource_dir}/lib/wasm32-unknown-wasi ${wasi_resource_dir}/lib/wasm32-unknown-wasip2
-  # Copy the `lib/wasm32-unknown-wasip1-threads` folder to `lib/wasm32-unknown-wasi-threads`
-  COMMAND ${CMAKE_COMMAND} -E copy_directory
-    ${wasi_resource_dir}/lib/wasm32-unknown-wasip1-threads ${wasi_resource_dir}/lib/wasm32-unknown-wasi-threads
-
   COMMENT "finalizing compiler-rt installation"
 )
 add_dependencies(compiler-rt-post-build compiler-rt-build)
@@ -152,7 +141,7 @@ function(define_wasi_libc_sub target target_suffix lto)
   if(${target} MATCHES threads)
     set(libcompiler_rt_a ${wasi_resource_dir}/lib/wasm32-unknown-wasip1-threads/libclang_rt.builtins.a)
   else()
-    set(libcompiler_rt_a ${wasi_resource_dir}/lib/wasm32-unknown-wasip1/libclang_rt.builtins.a)
+    set(libcompiler_rt_a ${wasi_resource_dir}/lib/wasm32-unknown-wasip3/libclang_rt.builtins.a)
   endif()
 
   set(extra_cmake_args)
@@ -312,7 +301,7 @@ function(define_libcxx target)
 endfunction()
 
 foreach(target IN LISTS WASI_SDK_TARGETS)
-  define_libcxx(${target})
+  #define_libcxx(${target})
 endforeach()
 
 # =============================================================================
@@ -336,7 +325,7 @@ endif()
 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-${target}  wasi-libc-${target} compiler-rt)
   add_dependencies(build build-${target})
 endforeach()
 
diff --git a/cmake/wasi-sdk-toolchain.cmake b/cmake/wasi-sdk-toolchain.cmake
index fa972b9..7a6dc88 100644
--- a/cmake/wasi-sdk-toolchain.cmake
+++ b/cmake/wasi-sdk-toolchain.cmake
@@ -82,8 +82,8 @@ ExternalProject_Add(llvm-build
     -DLLVM_ENABLE_ZLIB=OFF
     -DLLVM_ENABLE_ZSTD=OFF
     -DLLVM_STATIC_LINK_CXX_STDLIB=ON
-    -DLLVM_INCLUDE_TESTS=OFF
-    -DLLVM_INCLUDE_UTILS=OFF
+    -DLLVM_INCLUDE_TESTS=ON
+    -DLLVM_INCLUDE_UTILS=ON
     -DLLVM_INCLUDE_BENCHMARKS=OFF
     -DLLVM_INCLUDE_EXAMPLES=OFF
     -DLLVM_TARGETS_TO_BUILD=WebAssembly
@@ -123,16 +123,35 @@ set(wasm_component_ld_version 0.5.20)
 if(RUST_TARGET)
   set(rust_target_flag --target=${RUST_TARGET})
 endif()
-add_custom_command(
-  OUTPUT ${wasm_component_ld}
-  COMMAND
-    cargo install --root ${wasm_component_ld_root} ${rust_target_flag}
-      wasm-component-ld@${wasm_component_ld_version}
-  COMMAND
-    cmake -E make_directory ${wasi_tmp_install}/bin
-  COMMAND
-    cmake -E copy ${wasm_component_ld} ${wasi_tmp_install}/bin
-  COMMENT "Building `wasm-component-ld` ...")
+
+# Option to use local wasm-component-ld source instead of cargo install
+set(WASM_COMPONENT_LD_SOURCE "" CACHE PATH "Path to wasm-component-ld source directory")
+
+if(WASM_COMPONENT_LD_SOURCE)
+  # Build from local source
+  add_custom_command(
+    OUTPUT ${wasm_component_ld}
+    COMMAND
+      cargo install --root ${wasm_component_ld_root} ${rust_target_flag}
+        --path ${WASM_COMPONENT_LD_SOURCE}
+    COMMAND
+      cmake -E make_directory ${wasi_tmp_install}/bin
+    COMMAND
+      cmake -E copy ${wasm_component_ld} ${wasi_tmp_install}/bin
+    COMMENT "Building `wasm-component-ld` from ${WASM_COMPONENT_LD_SOURCE}...")
+else()
+  # Install from crates.io
+  add_custom_command(
+    OUTPUT ${wasm_component_ld}
+    COMMAND
+      cargo install --root ${wasm_component_ld_root} ${rust_target_flag}
+        wasm-component-ld@${wasm_component_ld_version}
+    COMMAND
+      cmake -E make_directory ${wasi_tmp_install}/bin
+    COMMAND
+      cmake -E copy ${wasm_component_ld} ${wasi_tmp_install}/bin
+    COMMENT "Building `wasm-component-ld` ...")
+endif()
 add_custom_target(wasm-component-ld DEPENDS ${wasm_component_ld})
 add_dependencies(build wasm-component-ld)
 
diff --git a/src/llvm-project b/src/llvm-project
index 222fc11..24cb457 160000
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit 222fc11f2b8f25f6a0f4976272ef1bb7bf49521d
+Subproject commit 24cb457d6615fbc39e03099690da0fc096b1246b
diff --git a/src/wasi-libc b/src/wasi-libc
index 6036a9f..7b8632e 160000
--- a/src/wasi-libc
+++ b/src/wasi-libc
@@ -1 +1 @@
-Subproject commit 6036a9f3e349315faba2732a32508d5dc9d6d928
+Subproject commit 7b8632e0c8dc3d6ac44d5fd557137d96ef23cfb8