buildroot/package/llvm-project/llvm/0001-Fix-standalone-build-for-llvm.patch

From 255068deb7f3d18837ed30e739aa92c111ab450a Mon Sep 17 00:00:00 2001
From: El Mehdi YOUNES <elmehdi.younes@smile.fr>
Date: Sat, 10 May 2025 12:55:07 +0200
Subject: [PATCH] Fix standalone build for llvm

Upstream commit 9dd01a5241dc ("Harmonize cmake_policy() across standalone builds of all projects")
moved the `cmake_policy()` settings from `llvm/CMakeLists.txt` into a shared
`cmake/modules/CMakePolicy.cmake`, and included it from all relevant projects
(Clang, LLD, LLDB, etc.) to harmonize standalone builds.

However, in `llvm/CMakeLists.txt`, unlike other components, the line:
    set(LLVM_COMMON_CMAKE_UTILS ...)
was left **without** the usual:
    if(NOT DEFINED LLVM_COMMON_CMAKE_UTILS)

This prevents external build systems (e.g., when using separate source archives)
from overriding the `LLVM_COMMON_CMAKE_UTILS` variable, since the value is
always reset unconditionally.

This patch adds the missing `if(NOT DEFINED LLVM_COMMON_CMAKE_UTILS)` guard,
in the same way as it is already done in Clang, LLD, etc., to make
`LLVM_COMMON_CMAKE_UTILS` properly overridable.

Upstream: Not submitted

Signed-off-by: El Mehdi YOUNES <elmehdi.younes@smile.fr>
---
 llvm/CMakeLists.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5293e866324..d861233f299f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,10 @@ cmake_minimum_required(VERSION 3.20.0)
 
 include(CMakeDependentOption)
 
-set(LLVM_COMMON_CMAKE_UTILS ${CMAKE_CURRENT_SOURCE_DIR}/../cmake)
+if(NOT DEFINED LLVM_COMMON_CMAKE_UTILS)
+  set(LLVM_COMMON_CMAKE_UTILS ${CMAKE_CURRENT_SOURCE_DIR}/../cmake)
+endif()
+
 include(${LLVM_COMMON_CMAKE_UTILS}/Modules/CMakePolicy.cmake
   NO_POLICY_SCOPE)
 
-- 
2.49.0