From 8e5f93d039b744b9ee0ae412b162e59a6cd93b27 Mon Sep 17 00:00:00 2001
From: Robert Schulze <robert@clickhouse.com>
Date: Thu, 19 Mar 2026 19:58:14 +0000
Subject: [PATCH] Merge pull request #100023 from zheguang/fix-llvm-libc-link

Fix llvm-libc link error with -O0 build
---
 contrib/libllvmlibc-cmake/CMakeLists.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/contrib/libllvmlibc-cmake/CMakeLists.txt b/contrib/libllvmlibc-cmake/CMakeLists.txt
index 3eaeaf30a79a..e11d93d9aa85 100644
--- a/contrib/libllvmlibc-cmake/CMakeLists.txt
+++ b/contrib/libllvmlibc-cmake/CMakeLists.txt
@@ -62,6 +62,7 @@ set(LLVMLIBC_DEFS_COMMON
     LIBC_MATH_HAS_NO_ERRNO=1
     LIBC_MATH_HAS_NO_EXCEPT=1
     LIBC_MATH_HAS_SKIP_ACCURATE_PASS=1
+    LIBC_ERRNO_MODE=6
 )
 
 if (ARCH_AMD64)