From f529eda6c32d8c3cb8e7dabbfc84cf87215ce311 Mon Sep 17 00:00:00 2001
From: nzfeng <nicolefeng7@gmail.com>
Date: Thu, 22 Sep 2022 16:22:30 -0400
Subject: [PATCH] Edit CMakeLists.txt to handle Apple M1 architecture, which
 does not support the -march=native flag.

---
 CMakeLists.txt | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1e5dcb1..a512684 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,7 +36,15 @@ if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" OR "${CMAKE_CXX_COMPILER_ID}" STR
   endif()
   
   SET(CMAKE_CXX_FLAGS "${BASE_CXX_FLAGS} ${DISABLED_WARNINGS}")
-  SET(CMAKE_CXX_FLAGS_RELEASE        "-O3 -march=native -DNDEBUG")
+
+  include(CheckCXXCompilerFlag)
+  unset(COMPILER_SUPPORTS_MARCH_NATIVE CACHE)
+  CHECK_CXX_COMPILER_FLAG(-march=native COMPILER_SUPPORTS_MARCH_NATIVE)
+  if(COMPILER_SUPPORTS_MARCH_NATIVE)
+    SET(CMAKE_CXX_FLAGS_RELEASE        "-O3 -march=native -DNDEBUG")
+  else()
+    SET(CMAKE_CXX_FLAGS_RELEASE        "-O3 -mcpu=apple-m1 -DNDEBUG") # Apple M1
+  endif()
 
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
   # using Visual Studio C++