From 463dc2544bcaf11096c284efcb7e4205bdb18a54 Mon Sep 17 00:00:00 2001
From: Sy Brand <sy.brand@fastly.com>
Date: Wed, 24 Jun 2026 13:04:46 +0100
Subject: [PATCH] Add option for coop threading

---
 cmake/wasi-sdk-sysroot.cmake | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cmake/wasi-sdk-sysroot.cmake b/cmake/wasi-sdk-sysroot.cmake
index 6e02539..1b28417 100644
--- a/cmake/wasi-sdk-sysroot.cmake
+++ b/cmake/wasi-sdk-sysroot.cmake
@@ -25,6 +25,7 @@ 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_EXCEPTIONS "Whether or not C++ exceptions are enabled" OFF)
+option(WASI_SDK_COOP_THREADING "Whether or not to build with cooperative threading support" OFF)
 set(WASI_SDK_CPU_CFLAGS "-mcpu=lime1" CACHE STRING "CFLAGS to specify wasm features to enable")
 
 set(wasi_tmp_install ${CMAKE_CURRENT_BINARY_DIR}/install)
@@ -174,6 +175,7 @@ function(define_wasi_libc_sub target target_suffix lto)
       -DUSE_WASM_COMPONENT_LD=OFF
       -DWASI_SDK_VERSION=${wasi_sdk_version}
       -DBUILD_TESTS=ON
+      -DENABLE_COOP_THREADS=${WASI_SDK_COOP_THREADING}
     DEPENDS compiler-rt
     EXCLUDE_FROM_ALL ON
     USES_TERMINAL_CONFIGURE ON