From 8c55ac729b944613886014436164a20fa5910f2c Mon Sep 17 00:00:00 2001
From: Varun Agrawal <varagrawal@gmail.com>
Date: Sat, 19 Mar 2022 19:51:59 -0400
Subject: [PATCH] check for mac silicon for march=native

---
 cmake/GtsamBuildTypes.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/GtsamBuildTypes.cmake b/cmake/GtsamBuildTypes.cmake
index fac2bdba5..9058807ad 100644
--- a/cmake/GtsamBuildTypes.cmake
+++ b/cmake/GtsamBuildTypes.cmake
@@ -191,7 +191,7 @@ endif()
 
 if (NOT MSVC)
   option(GTSAM_BUILD_WITH_MARCH_NATIVE  "Enable/Disable building with all instructions supported by native architecture (binary may not be portable!)" ON)
-  if(GTSAM_BUILD_WITH_MARCH_NATIVE)
+  if(GTSAM_BUILD_WITH_MARCH_NATIVE AND (APPLE AND NOT CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64"))
     # Add as public flag so all dependant projects also use it, as required
     # by Eigen to avid crashes due to SIMD vectorization:
     list_append_cache(GTSAM_COMPILE_OPTIONS_PUBLIC "-march=native")