From 05912474750b6a577990a8c38184922876993e65 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <chfast@gmail.com>
Date: Mon, 11 Jan 2021 22:30:24 +0100
Subject: [PATCH] cmake: Add option to select micro-arch, use x86-64-v2 by
 default

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a009a11a5a..d970ea0d4a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,6 +72,16 @@ set(CMAKE_C_VISIBILITY_PRESET hidden)
 set(CMAKE_CXX_VISIBILITY_PRESET hidden)
 set(CMAKE_VISIBILITY_INLINES_HIDDEN YES)
 
+if(CMAKE_SYSTEM_PROCESSOR STREQUAL x86_64)
+    # Setup options for x86_64 micro-architecture levels.
+    # https://clang.llvm.org/docs/UsersManual.html#x86
+    set(X86_64_ARCH_LEVEL 2 CACHE STRING "The x86_64 micro-architecture level")
+    if(X86_64_ARCH_LEVEL GREATER 0)
+        add_compile_options(-march=x86-64-v${X86_64_ARCH_LEVEL})
+        message(STATUS "x86_64 micro-architecture level: ${X86_64_ARCH_LEVEL}")
+    endif()
+endif()
+
 include(GNUInstallDirs)
 
 if(EVMONE_FUZZING)