From: Mika Lindqvist <postmaster@raasu.org>
Date: Thu, 21 Dec 2023 08:19:54 +0000 (+0200)
Subject: Check if compiler supports -march=native or -mcpu=native.
X-Git-Tag: 2.1.6~19
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0756ec4643f6d540df05dd44e4ede676f3fad259;p=thirdparty%2Fzlib-ng.git

Check if compiler supports -march=native or -mcpu=native.
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9170ed58..b7d15699 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -252,11 +252,18 @@ endif()
 # Set native march/mcpu
 if(WITH_NATIVE_INSTRUCTIONS)
     if(CMAKE_C_COMPILER_ID MATCHES "GNU" OR CMAKE_C_COMPILER_ID MATCHES "Clang")
-        if(BASEARCH_PPC_FOUND)
-            set(NATIVEFLAG "-mcpu=native")
-        else()
+        check_c_compiler_flag(-march=native HAVE_MARCH_NATIVE)
+        if(HAVE_MARCH_NATIVE)
             set(NATIVEFLAG "-march=native")
+        else()
+            check_c_compiler_flag(-mcpu=native HAVE_MCPU_NATIVE)
+            if(HAVE_MCPU_NATIVE)
+                set(NATIVEFLAG "-mcpu=native")
+            endif()
         endif()
+        # Fall through
+    endif()
+    if(NATIVEFLAG)
         # Apply flag to all source files and compilation checks
         add_compile_options(${NATIVEFLAG})
     else()