https://gitlab.com/iucode-tool/iucode-tool/-/merge_requests/5

From dd2511c343b4eb62a28edf330dfc9e2c2e750a88 Mon Sep 17 00:00:00 2001
From: James Le Cuirot <jlecuirot@microsoft.com>
Date: Mon, 2 Feb 2026 11:16:13 +0000
Subject: [PATCH] iucode_tool: Allow building on non-x86 little endian
 architectures

This is obviously an Intel x86-specific tool, but that doesn't mean it
cannot be used elsewhere to prepare x86 images. The code is still
endian-sensitive though, so the configure check to disallow big endian
remains.

Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com>
--- a/iucode_tool.c
+++ b/iucode_tool.c
@@ -30,7 +30,10 @@
 #include <argp.h>
 #include <dirent.h>
 #include <time.h>
+
+#if defined(__x86_64__) || defined(__i386__)
 #include <cpuid.h>
+#endif
 
 #include "intel_microcode.h"
 
@@ -2933,11 +2936,16 @@ static int scan_system_processors(unsigned int strategy,
 	assert(filter_list);
 
 	print_msg(3, "trying to get CPUID information directly");
+#if defined(__x86_64__) || defined(__i386__)
 	if (!(__get_cpuid(0, &id0, &id1, &id2, &id3) &&
 	      __get_cpuid(1, &sig, &idx, &idx, &idx))) {
 		print_msg(1, "microcode signature unavailable");
 		return 0;
 	}
+#else
+	print_msg(1, "CPUID instruction not available on this architecture");
+	return 0;
+#endif
 
 	/*
 	 * fail-safe: only change filter_list_allow (switch away from "select
-- 
2.51.2