chore: remove llvm dependency

Author: XuJiandong

Makefile

@@ -124,7 +124,6 @@ prepare:
 	wget 'https://github.com/nervosnetwork/ckb-standalone-debugger/releases/download/v0.200.2/ckb-debugger_v0.200.2_x86_64-unknown-linux-gnu.tar.gz'
 	tar xzvf ckb-debugger_v0.200.2_x86_64-unknown-linux-gnu.tar.gz
 	mv ckb-debugger ~/.cargo/bin
-	wget https://apt.llvm.org/llvm.sh && chmod +x llvm.sh && sudo ./llvm.sh 18 && rm llvm.sh
 
 ci: build
 	ls -alht build/release

scripts/find_clang

@@ -2,31 +2,4 @@
 #
 # An utility script used to find a binary of clang 16+
 
-if [[ -n "${CLANG}" ]]; then
-  echo "${CLANG}"
-  exit 0
-fi
-
-CANDIDATES=("clang" "clang-16" "clang-17" "clang-18")
-
-BREW_PREFIX=$(brew --prefix 2> /dev/null)
-if [[ -n "${BREW_PREFIX}" ]]; then
-  CANDIDATES+=(
-    "${BREW_PREFIX}/opt/llvm/bin/clang"
-    "${BREW_PREFIX}/opt/llvm@16/bin/clang"
-    "${BREW_PREFIX}/opt/llvm@17/bin/clang"
-    "${BREW_PREFIX}/opt/llvm@18/bin/clang"
-  )
-fi
-
-for candidate in ${CANDIDATES[@]}; do
-  OUTPUT=$($candidate -dumpversion 2> /dev/null | cut -d'.' -f 1)
-
-  if [[ $((OUTPUT)) -ge 16 ]]; then
-    echo "$candidate"
-    exit 0
-  fi
-done
-
->&2 echo "Cannot find clang of version 16+!"
-exit 1
+echo "clang"