Use add_compile_options() instead of set()

Author: mhucka

pybind_interface/avx2/CMakeLists.txt

@@ -16,9 +16,9 @@ cmake_minimum_required(VERSION 3.31)
 project(qsim)
 
 IF (WIN32)
-    set(CMAKE_CXX_FLAGS "/arch:AVX2")
+    add_compile_options(CMAKE_CXX_FLAGS "/arch:AVX2")
 ELSE()
-    set(CMAKE_CXX_FLAGS "-mavx2 -mfma")
+    add_compile_options(CMAKE_CXX_FLAGS "-mavx2 -mfma")
 ENDIF()
 
 INCLUDE(../GetPybind11.cmake)

pybind_interface/avx512/CMakeLists.txt

@@ -16,9 +16,9 @@ cmake_minimum_required(VERSION 3.31)
 project(qsim)
 
 IF (WIN32)
-    set(CMAKE_CXX_FLAGS "/arch:AVX512")
+    add_compile_options(CMAKE_CXX_FLAGS "/arch:AVX512")
 ELSE()
-    set(CMAKE_CXX_FLAGS "-mavx512f -mbmi2")
+    add_compile_options(CMAKE_CXX_FLAGS "-mavx512f -mbmi2")
 ENDIF()
 
 INCLUDE(../GetPybind11.cmake)