From de442483eee7343eb6ae74946259a9627cfe6891 Mon Sep 17 00:00:00 2001
From: Archit Tamarapu <archit.tamarapu@iis.fraunhofer.de>
Date: Tue, 5 May 2026 19:00:40 +0200
Subject: [PATCH] [fix] don't force CMAKE_C_COMPILER unconditionally in
 CMakeLists.txt

---
 CMakeLists.txt | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 01339ec2f..fc9dc6967 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -63,9 +63,13 @@ if(UNIX)
   # to be uncommented in CI
   # set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror")
 
-  # set C compiler
-  find_program(cc NAMES clang-18 clang REQUIRED)
-  set(CMAKE_C_COMPILER "${cc}" CACHE STRING "")
+  # Prefer clang-18 only when IVAS is built standalone
+  # don't override CMAKE_C_COMPILER if it's already set
+  if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR AND NOT CMAKE_C_COMPILER)
+    # set C compiler
+    find_program(cc NAMES clang-18 clang REQUIRED)
+    set(CMAKE_C_COMPILER "${cc}" CACHE FILEPATH "")
+  endif()
 
   # CLANG
   if(CLANG)
-- 
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