From b5b47da70922572e9ce0668beea3e287e92fd6c6 Mon Sep 17 00:00:00 2001
From: localai-org-maint-bot
 <306269227+localai-org-maint-bot@users.noreply.github.com>
Date: Thu, 30 Jul 2026 05:06:45 +0000
Subject: [PATCH] fix(vllm-cpp): tolerate Apple Clang folding warning

Keep the GNU constant-folding diagnostics visible on Darwin without allowing vllm.cpp's global -Werror to fail the Metal backend build.

Assisted-by: Codex:gpt-5 [systematic-debugging]
---
 backend/go/vllm-cpp/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/backend/go/vllm-cpp/Makefile b/backend/go/vllm-cpp/Makefile
index 7d502683b..898116176 100644
--- a/backend/go/vllm-cpp/Makefile
+++ b/backend/go/vllm-cpp/Makefile
@@ -56,6 +56,11 @@ endif
 UNAME_S := $(shell uname -s)
 ifeq ($(UNAME_S),Darwin)
 	LIB=libvllm.dylib
+	# Apple Clang diagnoses a pair of constant-folded array bounds in the Metal
+	# build as a GNU extension. vllm.cpp's global -Werror otherwise turns these
+	# warnings into a hard failure; keep them visible without failing the build.
+	CMAKE_ARGS+=-DCMAKE_CXX_FLAGS=-Wno-error=gnu-folding-constant
+	CMAKE_ARGS+=-DCMAKE_OBJCXX_FLAGS=-Wno-error=gnu-folding-constant
 else
 	LIB=libvllm.so
 endif