[compiler-rt] [compiler-rt][cmake] filter libc-backed builtins superseded by assembly (PR #213481)

[via llvm-commits]

https://github.com/hulxv created https://github.com/llvm/llvm-project/pull/213481

apply https://github.com/llvm/llvm-project/pull/209900#discussion_r3615454574

Part of #197824

>From 7c64aeab216988f823a35022f85805a1618c362b Mon Sep 17 00:00:00 2001
From: hulxv <hulxxv at gmail.com>
Date: Sat, 1 Aug 2026 22:21:26 +0300
Subject: [PATCH] [compiler-rt][cmake] filter libc-backed builtins superseded
 by assembly

---
 compiler-rt/cmake/Modules/CompilerRTUtils.cmake | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
index e4e3cfb9a2d99..7c0fe60231320 100644
--- a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
+++ b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
@@ -487,6 +487,8 @@ function(filter_builtin_sources inout_var name)
         if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/${_cname}")
           message(STATUS "For ${name} builtins preferring ${_file} to ${_cname}")
           list(REMOVE_ITEM intermediate ${_cname})
+          string(REGEX REPLACE "\\.c$" ".cpp" _cppname "${_cname}")
+          list(REMOVE_ITEM intermediate ${_cppname})
         endif()
       endforeach()
     endif()