[clang] [clang] perf_helper.py ignore clang warning/note when parsing cc1 command (PR #212401)

[Henry Jiang via cfe-commits]

https://github.com/mustartt created https://github.com/llvm/llvm-project/pull/212401

Parsing cc1 command fails in `perf_helper` when `clang: note:` or `clang: warning:` due to driver warnings. As an example, harmless macOS sdk mismatch and `-Wunused-command-line-argument`.

>From 5097b1ce0961a0447d2056c8556e4ed3e86d63cd Mon Sep 17 00:00:00 2001
From: Henry Jiang <henry_jiang2 at apple.com>
Date: Mon, 27 Jul 2026 21:40:14 -0700
Subject: [PATCH] [clang][PGO] ignore clang warning/note when parsing cc1
 command

---
 clang/utils/perf-training/perf-helper.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/clang/utils/perf-training/perf-helper.py b/clang/utils/perf-training/perf-helper.py
index 97b771103ae2b..b4917e1aa1565 100644
--- a/clang/utils/perf-training/perf-helper.py
+++ b/clang/utils/perf-training/perf-helper.py
@@ -276,6 +276,8 @@ def get_cc1_command_for_args(cmd, env):
             or ln.startswith(" (in-process)")
             or ln.startswith("Configuration file:")
             or ln.startswith("Build config:")
+            or ln.startswith("clang: warning:")
+            or ln.startswith("clang: note:")
             or " version " in ln
         ):
             continue