[llvm] [GitHub] Fix slow sccache install on macOS by upgrading macOS version (PR #77165)

[Craig Hesling via llvm-commits]

https://github.com/linux4life798 created https://github.com/llvm/llvm-project/pull/77165

The "Setup ccache" step on macOS-11 builds takes between 15 to 20 mins, whereas this step takes a less than 10 seconds on other runners. The bulk of this time is spent at the "Install sccache" step, where brew emits warnings like "Warning: You are using macOS 11." and "We (and Apple) do not provide support for this old version...".

Bumping the version of macOS greatly decreases this cache setup time to about 20 seconds. Furthermore, it seems like it is speeding up general build times, too.

It appears that https://github.com/actions/virtual-environments/issues/5900 has been resolved or obsoleted, so I do not believe
we need to lock macOS to 11 anymore.

>From a991695fb36fd25632051f634fbf97165941a9f0 Mon Sep 17 00:00:00 2001
From: Craig Hesling <craig at hesling.com>
Date: Fri, 5 Jan 2024 20:05:27 -0500
Subject: [PATCH] [GitHub] Fix slow sccache install on macOS by upgrading macOS
 version

The "Setup ccache" step on macOS-11 builds takes between 15 to 20 mins,
whereas this step takes a less than 10 seconds on other runners.
The bulk of this time is spent at the "Install sccache" step, where brew
emits warnings like "Warning: You are using macOS 11." and
"We (and Apple) do not provide support for this old version...".

Bumping the version of macOS greatly decreases this cache setup time to
about 20 seconds. Furthermore, it seems like it is speeding up general
build times, too.

It appears that https://github.com/actions/virtual-environments/issues/5900
has been resolved, so I do not believe we need to lock macOS to 11 anymore.
---
 .github/workflows/llvm-project-tests.yml | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/.github/workflows/llvm-project-tests.yml b/.github/workflows/llvm-project-tests.yml
index 02b1ab75e960ec..e8bdffc2293916 100644
--- a/.github/workflows/llvm-project-tests.yml
+++ b/.github/workflows/llvm-project-tests.yml
@@ -34,9 +34,7 @@ on:
         type: string
         # Use windows-2019 due to:
         # https://developercommunity.visualstudio.com/t/Prev-Issue---with-__assume-isnan-/1597317
-        # We're using a specific version of macOS due to:
-        # https://github.com/actions/virtual-environments/issues/5900
-        default: '["ubuntu-latest", "windows-2019", "macOS-11"]'
+        default: '["ubuntu-latest", "windows-2019", "macOS-latest"]'
 
 concurrency:
   # Skip intermediate builds: always.