From 82c242f370ccb20753d0a3b64965fddb4c0d82c2 Mon Sep 17 00:00:00 2001
From: Cursor Agent <cursoragent@cursor.com>
Date: Mon, 3 Aug 2026 14:02:37 +0000
Subject: [PATCH] CI: download Metal toolchain on xcode-27
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Matches PrivateMusic2 — Xcode 27 hosted runners omit the Metal
toolchain, which breaks Telegram MetalCompile (NV12VideoShaders).

Co-authored-by: D3C0Y <decoder-dev@users.noreply.github.com>
---
 .github/workflows/build.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3194da4f6ca..a9c2486b3b5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -81,6 +81,10 @@ jobs:
           fi
           xcodebuild -version
 
+      # Same as decoder-dev/PrivateMusic2 — Xcode 27 runners ship without Metal by default.
+      - name: Prepare Metal toolchain
+        run: sudo xcodebuild -downloadComponent MetalToolchain || true
+
       - name: Free disk space
         run: |
           set -euo pipefail