fixup! arrow: use clang from llvm installation to avoid stack probing…

… issue with llvm@18

arrow.sh

@@ -62,18 +62,18 @@ rsync -a --exclude='**/.git' --delete --delete-excluded "$SOURCEDIR/" ./src_tmp/
 case $ARCHITECTURE in
   osx*)
    # use default llvm from homebrew if available
-   if [ -d `brew --prefix llvm` ]; then
-     CLANG_EXECUTABLE=`brew --prefix llvm`/bin/clang
+   if [ -d "$(brew --prefix llvm)" ]; then
+     CLANG_EXECUTABLE="`brew --prefix llvm`/bin/clang"
    else
      # fall back to llvm@17
-     if [ -d `brew --prefix llvm`@17 ]; then
-       CLANG_EXECUTABLE=`brew --prefix llvm`@17/bin/clang
+     if [ -d "$(brew --prefix llvm)@17" ]; then
+       CLANG_EXECUTABLE="`brew --prefix llvm`@17/bin/clang"
      fi
 
    fi
    ;;
   *)
-   CLANG_EXECUTABLE=${CLANG_ROOT}/bin-safe/clang
+   CLANG_EXECUTABLE="${CLANG_ROOT}/bin-safe/clang ${GCC_TOOLCHAIN_REVISION:+--gcc-install-dir=$GCC_TOOLCHAIN_ROOT}"
    # this patches version script to hide llvm symbols in gandiva library
    sed -i.deleteme '/^[[:space:]]*extern/ a \ \ \ \ \ \ llvm*; LLVM*;' "./src_tmp/cpp/src/gandiva/symbols.map"
    ;;