From 1ae01da637c342f1bd5def79b2114018f66503bf Mon Sep 17 00:00:00 2001
From: "Alina (Xi) Li" <96995091+alinaliBQ@users.noreply.github.com>
Date: Fri, 20 Mar 2026 13:52:13 -0700
Subject: [PATCH] Export `CLANG_TOOLS_PATH` to `llvm@18`

Currently CLANG_TOOLS_PATH path is resolved as /usr/local/bin/clang-format. This is likely due to a new macOS update mentioned in xpack-dev-tools/clang-xpack#13. Before the GitHub macOS update, CLANG_TOOLS_PATH was resolved as /usr/local/opt/llvm@18/bin and we did not have the issue of libunwind linking dynamically to ODBC dylib.

The solution is to explicitly set CLANG_TOOLS_PATH to llvm@18/bin.
---
 .github/workflows/cpp_extra.yml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/.github/workflows/cpp_extra.yml b/.github/workflows/cpp_extra.yml
index 8ebf3b9dfbfe..1195152a23b5 100644
--- a/.github/workflows/cpp_extra.yml
+++ b/.github/workflows/cpp_extra.yml
@@ -414,6 +414,12 @@ jobs:
           ODBC_INCLUDE_DIR=$LIBIODBC_DIR/include
           export ARROW_CMAKE_ARGS="-DODBC_INCLUDE_DIR=$ODBC_INCLUDE_DIR"
           export CXXFLAGS="$CXXFLAGS -I$ODBC_INCLUDE_DIR"
+
+          if [ "${{ matrix.macos-version }}" = "15-intel" ]; then
+            # GH-49563 Explicitly set llvm path to avoid linking to libunwind
+            export CLANG_TOOLS_PATH=/usr/local/opt/llvm@18/bin
+          fi
+          
           ci/scripts/cpp_build.sh $(pwd) $(pwd)/build
       - name: Setup Python
         uses: actions/setup-python@v6