From 776146e9ebb6bbe17a37bfad955f3dac95317275 Mon Sep 17 00:00:00 2001
From: Josh Stone <jistone@redhat.com>
Date: Thu, 16 Nov 2023 10:42:23 -0800
Subject: [PATCH] bootstrap: only show PGO warnings when verbose

Building rustc with `--rust-profile-use` is currently dumping a lot of
warnings of "no profile data available for function" from `rustc_smir`
and `stable_mir`. These simply aren't exercised by the current profile-
gathering steps, but that's to be expected for new or experimental
functionality. I think for most people, these warnings will be just
noise, so it makes sense to only have them in verbose builds.
---
 src/bootstrap/src/core/build_steps/compile.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index af69860df1c5..51e4195827fc 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -887,7 +887,9 @@ fn run(self, builder: &Builder<'_>) {
         } else if let Some(path) = &builder.config.rust_profile_use {
             if compiler.stage == 1 {
                 cargo.rustflag(&format!("-Cprofile-use={path}"));
-                cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
+                if builder.is_verbose() {
+                    cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
+                }
                 true
             } else {
                 false
-- 
2.43.0