From 32a63f7ff0e044e0bd0554d70a405ae7377f7085 Mon Sep 17 00:00:00 2001
From: wirthual <wirthra@gmail.com>
Date: Thu, 12 Feb 2026 16:02:09 -0800
Subject: [PATCH 1/2] add option for building with -march=native flag

---
 CMakeLists.txt     |  3 ++-
 cmake/option.cmake | 18 ++++++++++++------
 pyproject.toml     |  1 +
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 294af340..7c645417 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,8 @@ project(zvec)
 set(CC_CXX_STANDARD 17)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror=return-type")
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Werror=return-type")
+set(CMAKE__FLAGS "${CMAKE_C_FLAGS} -Wall -Werror=return-type")
+
 
 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--no-as-needed")
diff --git a/cmake/option.cmake b/cmake/option.cmake
index ca74cf05..e840f82a 100644
--- a/cmake/option.cmake
+++ b/cmake/option.cmake
@@ -13,6 +13,8 @@ option(ENABLE_SAPPHIRERAPIDS "Enable Intel Sapphire Rapids Server CPU microarchi
 option(ENABLE_EMERALDRAPIDS "Enable Intel Emerald Rapids Server CPU microarchitecture" OFF)
 option(ENABLE_GRANITERAPIDS "Enable Intel Granite Rapids Server CPU microarchitecture" OFF)
 
+option(X86_ARCH_NATIVE "Build with -march=native" OFF)
+
 ## AMD Microarchitectures
 option(ENABLE_ZEN1 "Enable AMD Zen+ Family 17h CPU microarchitecture" OFF)
 option(ENABLE_ZEN2 "Enable AMD Zen 2 Family 17h CPU microarchitecture" OFF)
@@ -89,12 +91,16 @@ function(_detect_armv8_best)
 endfunction()
 
 function(_detect_x86_best)
-  set(_x86_flags
-    "graniterapids" "emeraldrapids" "sapphirerapids"
-    "skylake-avx512" "skylake"
-    "broadwell" "haswell" "sandybridge" "nehalem"
-    "znver3" "znver2" "znver1"
-  )
+  if(X86_ARCH_NATIVE)
+    set(_x86_flags "native")
+  else()
+    set(_x86_flags
+      "graniterapids" "emeraldrapids" "sapphirerapids"
+      "skylake-avx512" "skylake"
+      "broadwell" "haswell" "sandybridge" "nehalem"
+      "znver3" "znver2" "znver1"
+    )
+  endif()
   foreach(_arch IN LISTS _x86_flags)
     check_c_compiler_flag("-march=${_arch}" _COMP_SUPP_${_arch})
     if(_COMP_SUPP_${_arch})
diff --git a/pyproject.toml b/pyproject.toml
index dee6728d..f669b480 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -116,6 +116,7 @@ sdist.include = [
 [tool.scikit-build.cmake.define]
 BUILD_TOOLS = "OFF"
 BUILD_PYTHON_BINDINGS = "ON"
+X86_ARCH_NATIVE="ON"
 
 # Setuptools config for test pypi
 [tool.setuptools_scm]

From f9655e43d189ae32fdadf0f8488e71e4beed30bf Mon Sep 17 00:00:00 2001
From: wirthual <wirthra@gmail.com>
Date: Thu, 12 Feb 2026 16:06:51 -0800
Subject: [PATCH 2/2] add option for building with -march=native flag

---
 CMakeLists.txt | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7c645417..294af340 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,8 +4,7 @@ project(zvec)
 set(CC_CXX_STANDARD 17)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror=return-type")
-set(CMAKE__FLAGS "${CMAKE_C_FLAGS} -Wall -Werror=return-type")
-
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Werror=return-type")
 
 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--no-as-needed")