From 5cdbe1f1db3c734eacfef52aedd95edb6863f991 Mon Sep 17 00:00:00 2001
From: Roman Volosatovs <rvolosatovs@riseup.net>
Date: Thu, 12 Feb 2026 18:50:43 +0100
Subject: [PATCH] build wasip3 target

Signed-off-by: Roman Volosatovs <rvolosatovs@riseup.net>
---
 CMakeLists.txt               |  2 +-
 cmake/wasi-sdk-sysroot.cmake | 12 +++++++-----
 wasi-sdk-p3.cmake            | 37 ++++++++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+), 6 deletions(-)
 create mode 100644 wasi-sdk-p3.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a0d3fca..f3f78cc 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-wasi;wasm32-wasip1;wasm32-wasip2;wasm32-wasip3;wasm32-wasip1-threads;wasm32-wasi-threads"
   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 7be2a18..52ade5e 100644
--- a/cmake/wasi-sdk-sysroot.cmake
+++ b/cmake/wasi-sdk-sysroot.cmake
@@ -106,7 +106,7 @@ define_compiler_rt(wasm32-wasip1-threads)
 
 # 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`
+# `wasip2` and `wasip3`
 execute_process(
   COMMAND ${CMAKE_C_COMPILER} -print-resource-dir
   OUTPUT_VARIABLE clang_resource_dir
@@ -118,12 +118,14 @@ 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
+  # Copy the `lib/wasm32-unknown-wasi` folder to `lib/wasm32-unknown-wasi{p1,p2,p3}` 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
+  COMMAND ${CMAKE_COMMAND} -E copy_directory
+    ${wasi_resource_dir}/lib/wasm32-unknown-wasi ${wasi_resource_dir}/lib/wasm32-unknown-wasip3
   # 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
@@ -144,9 +146,9 @@ function(define_wasi_libc_sub target target_suffix lto)
   get_property(directory_cflags DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY COMPILE_OPTIONS)
   set(extra_cflags_list "${WASI_SDK_CPU_CFLAGS} ${CMAKE_C_FLAGS} ${directory_cflags}")
 
-  if(${target} MATCHES p2)
-    # Always enable `-fPIC` for the `wasm32-wasip2` target. This makes `libc.a`
-    # more flexible and usable in dynamic linking situations.
+  if(${target} MATCHES "p[23]")
+    # Always enable `-fPIC` for the `wasm32-wasip2` and `wasm32-wasip3` targets.
+    # This makes `libc.a` more flexible and usable in dynamic linking situations.
     list(APPEND extra_cflags_list -fPIC)
   endif()
 
diff --git a/wasi-sdk-p3.cmake b/wasi-sdk-p3.cmake
new file mode 100644
index 0000000..f737562
--- /dev/null
+++ b/wasi-sdk-p3.cmake
@@ -0,0 +1,37 @@
+# Cmake toolchain description file for the Makefile
+
+# Until Platform/WASI.cmake is upstream we need to inject the path to it
+# into CMAKE_MODULE_PATH.
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}")
+
+set(CMAKE_SYSTEM_NAME WASI)
+set(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_SYSTEM_PROCESSOR wasm32)
+set(triple wasm32-wasip3)
+
+if(WIN32)
+	set(WASI_HOST_EXE_SUFFIX ".exe")
+else()
+	set(WASI_HOST_EXE_SUFFIX "")
+endif()
+
+# When building from source, WASI_SDK_PREFIX represents the generated directory
+if(NOT WASI_SDK_PREFIX)
+    set(WASI_SDK_PREFIX ${CMAKE_CURRENT_LIST_DIR}/../../)
+endif()
+
+set(CMAKE_C_COMPILER ${WASI_SDK_PREFIX}/bin/clang${WASI_HOST_EXE_SUFFIX})
+set(CMAKE_CXX_COMPILER ${WASI_SDK_PREFIX}/bin/clang++${WASI_HOST_EXE_SUFFIX})
+set(CMAKE_ASM_COMPILER ${WASI_SDK_PREFIX}/bin/clang${WASI_HOST_EXE_SUFFIX})
+set(CMAKE_AR ${WASI_SDK_PREFIX}/bin/llvm-ar${WASI_HOST_EXE_SUFFIX})
+set(CMAKE_RANLIB ${WASI_SDK_PREFIX}/bin/llvm-ranlib${WASI_HOST_EXE_SUFFIX})
+set(CMAKE_C_COMPILER_TARGET ${triple})
+set(CMAKE_CXX_COMPILER_TARGET ${triple})
+set(CMAKE_ASM_COMPILER_TARGET ${triple})
+
+# Don't look in the sysroot for executables to run during the build
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+# Only look in the sysroot (not in the host paths) for the rest
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)