While working on reproducible builds for openSUSE, I found that
our xen-debugsource package varied between builds
because iasl from acpica embeds timestamps in generated .h files:

--- old /usr/src/debug/xen-4.18.2-testing/tools/libs/light/ssdt_tpm2.h 
2024-07-03 18:41:40.000000000 +0000
+++ new /usr/src/debug/xen-4.18.2-testing/tools/libs/light/ssdt_tpm2.h 
2024-07-03 18:41:40.000000000 +0000
@@ -4,7 +4,7 @@
  * ASL+ Optimizing Compiler/Disassembler version 20230628 (64-bit version)
  * Copyright (c) 2000 - 2023 Intel Corporation
  * 
- * Compilation of "ssdt_tpm2.asl" - Tue Aug 27 16:10:19 2024
+ * Compilation of "ssdt_tpm2.asl" - Wed Aug 21 02:45:43 2024
  * 
  * C source code output
  * AML code block contains 0x5B bytes

This was fixed upstream, but our acpica-no-compiletime.patch
mistakenly disabled this part.