From db60f64f8e2369c7e2fb006d52a1514404bf46eb Mon Sep 17 00:00:00 2001
From: Aaron Gamache <17752104+agamache@users.noreply.github.com>
Date: Sat, 6 Jun 2026 16:01:54 -0400
Subject: [PATCH] Compile with -ffp-contract=off on arm64 macOS (#6584)

---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c23f0303e8..3e0743c5cb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -136,6 +136,10 @@ set(CMAKE_C_FLAGS_RELEASE "-O2 -DNDEBUG")
 set(CMAKE_CXX_FLAGS_RELEASE "-O2 -DNDEBUG")
 set(CMAKE_OBJCXX_FLAGS_RELEASE "-O2 -DNDEBUG")
 endif()
+# IEEE 754 compliant floating-point rounding on arm64 macOS
+if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+    add_compile_options(-Xarch_arm64 -ffp-contract=off)
+endif()
 
 if(NOT CMAKE_BUILD_TYPE )
     set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "Choose the type of build." FORCE)