Make run-clang-tidy.sh pick a default LLVM installation

Author: alexreinking

run-clang-tidy.sh

@@ -13,8 +13,10 @@ get_thread_count () {
 
 if [ "$(uname)" == "Darwin" ]; then
   patch_file () { sed -i '' -E "$@"; }
+  _DEFAULT_LLVM_LOCATION="/opt/homebrew/opt/llvm@21"
 else
   patch_file () { sed -i -E "$@"; }
+  _DEFAULT_LLVM_LOCATION="/usr/lib/llvm-21"
 fi
 
 J=$(get_thread_count)
@@ -55,15 +57,18 @@ fi
 # export CLANG_TIDY_LLVM_INSTALL_DIR=/opt/homebrew/opt/llvm@21
 
 if [ -z "$CLANG_TIDY_LLVM_INSTALL_DIR" ]; then
-  echo "CLANG_TIDY_LLVM_INSTALL_DIR must point to an LLVM installation dir for this script."
-  exit
+    if [ -d "${_DEFAULT_LLVM_LOCATION}" ]; then
+        CLANG_TIDY_LLVM_INSTALL_DIR="${_DEFAULT_LLVM_LOCATION}"
+    else
+        echo "CLANG_TIDY_LLVM_INSTALL_DIR must point to an LLVM installation dir for this script."
+        exit
+    fi
 fi
 
 echo "CLANG_TIDY_LLVM_INSTALL_DIR = ${CLANG_TIDY_LLVM_INSTALL_DIR}"
 
 VERSION=$("${CLANG_TIDY_LLVM_INSTALL_DIR}/bin/clang-tidy" --version)
-if [[ ${VERSION} =~ .*version\ 21.* ]]
-then
+if [[ ${VERSION} =~ .*version\ 21.* ]]; then
     echo "clang-tidy version 21 found."
 else
     echo "CLANG_TIDY_LLVM_INSTALL_DIR must point to an LLVM 21 install!"