From eac5abe3207d27911e9a0b107d43e02dd864a19f Mon Sep 17 00:00:00 2001
From: Mehdi Amini <joker.eph@gmail.com>
Date: Tue, 29 Jul 2025 16:13:19 -0700
Subject: [PATCH] Fix llvm_process_sources to append source file properties
 instead of overriding it

This fixes the CLANG_VENDOR macro that disappeared because it
is set using the same mechanism and one was overriding the other.
---
 llvm/cmake/modules/LLVMProcessSources.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/llvm/cmake/modules/LLVMProcessSources.cmake b/llvm/cmake/modules/LLVMProcessSources.cmake
index a7f9517ad767c..6282b26bddded 100644
--- a/llvm/cmake/modules/LLVMProcessSources.cmake
+++ b/llvm/cmake/modules/LLVMProcessSources.cmake
@@ -62,7 +62,10 @@ function(llvm_process_sources OUT_VAR)
     get_filename_component(suf ${fn} EXT)
     if("${suf}" STREQUAL ".cpp" OR "${suf}" STREQUAL ".c")
       get_filename_component(short_name ${fn} NAME)
-      set_source_files_properties(${fn} PROPERTIES COMPILE_DEFINITIONS "__SHORT_FILE__=\"${short_name}\"")
+      set_property(
+          SOURCE ${fn}
+          APPEND
+          PROPERTY COMPILE_DEFINITIONS __SHORT_FILE__="${short_name}")
     endif()
   endforeach()