From c76fccf256a185a2a20008de2578fa5c8dab217f Mon Sep 17 00:00:00 2001
From: Ryan Houdek <Sonicadvance1@gmail.com>
Date: Tue, 3 Nov 2026 10:00:54 -0800
Subject: [PATCH] CMake: Add an llvm-mingw clang version check to preserve_all

llvm has supported preserve_all abi on Windows ABI since
https://github.com/llvm/llvm-project/pull/166436.
This has been in a clang release since 22.1. Do a clang version check to
ensure the compiler is >= 22.1 to enabled preserve_all under
wow64/arm64ec.

This will give a performance boost to applications that require x87 full
precision and a couple other minor things.
---
 CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a8aac4f3c..437fa7c56 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -254,7 +254,9 @@ check_cxx_source_compiles(
   HAS_CLANG_PRESERVE_ALL)
 unset(CMAKE_REQUIRED_FLAGS)
 if (HAS_CLANG_PRESERVE_ALL)
-  if (MINGW)
+  message(STATUS "Clang version ${CMAKE_CXX_COMPILER_VERSION}")
+  set(CLANG_MINIMUM_VERSION 22.1)
+  if (MINGW AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${CLANG_MINIMUM_VERSION})
     message(STATUS "Ignoring broken clang::preserve_all support")
     set(HAS_CLANG_PRESERVE_ALL FALSE)
   else()