From 1a08c75c8b5bfb3d63632339383ebe03f486318f Mon Sep 17 00:00:00 2001
From: Sy Brand <sy.brand@fastly.com>
Date: Tue, 3 Mar 2026 14:46:19 +0000
Subject: [PATCH] Add toolchain file

---
 version.py        |  4 ++--
 wasi-sdk-p3.cmake | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 2 deletions(-)
 create mode 100644 wasi-sdk-p3.cmake

diff --git a/version.py b/version.py
index fe05d97..d4325b8 100755
--- a/version.py
+++ b/version.py
@@ -30,13 +30,13 @@ def git_commit(dir):
 def parse_git_version(version):
     # Parse, e.g.: wasi-sdk-21-0-g317548590b40+m
     assert version.startswith('wasi-sdk-'), f'unexpected version format: {version}'
-    version = version.removeprefix('wasi-sdk-')
+    version = version[len('wasi-sdk-'):]
 
     prefix = ''
     for special in KNOWN_SPECIAL_RELEASES:
         if version.startswith(f'{special}-'):
             prefix = f'{special}-'
-            version = version.removeprefix(f'{special}-')
+            version = version[len(f'{special}-'):]
             break
 
     parts = version.replace('+', '-').split('-')
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)