From fc17e09029a4f01fb59778e8575faa99a08f289a Mon Sep 17 00:00:00 2001
From: Kai Luo <lkail@cn.ibm.com>
Date: Wed, 13 Sep 2023 16:05:50 +0800
Subject: [PATCH] Add comment to elaborate

---
 src/bootstrap/bootstrap.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index bc8b5326d8d..eca3a522f80 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -313,6 +313,12 @@ def default_build_triple(verbose):
         # these cases, fall back to using sys.platform.
         return 'x86_64-pc-windows-msvc'
     elif kernel == 'AIX':
+        # `uname -m` returns the machine ID rather than machine hardware on AIX,
+        # so we are unable to use cputype to form triple. Since AIX 7.2 and
+        # above supports 32-bit and 64-bit mode simultaneously and `uname -p`
+        # returns `powerpc`. Currently we only supports `powerpc64-ibm-aix` in
+        # rust. For above reasons, kerneltype_mapper and cputype_mapper are not
+        # used to infer AIX's triple.
         return 'powerpc64-ibm-aix'
     else:
         err = "unknown OS type: {}".format(kernel)