Add debugging

Author: savannahostrowski

Tools/jit/_llvm.py

@@ -72,18 +72,25 @@ async def _get_brew_llvm_prefix(llvm_version: str, *, echo: bool = False) -> str
 
 @_async_cache
 async def _find_tool(tool: str, llvm_version: str, *, echo: bool = False) -> str | None:
+    print(f"DEBUG: Searching for {tool} (LLVM {llvm_version})")
     # Unversioned executables:
     path = tool
+    print(f"DEBUG: Trying unversioned: {path}")
     if await _check_tool_version(path, llvm_version, echo=echo):
+        print(f"DEBUG: Found at: {path}")
         return path
     # Versioned executables:
     path = f"{tool}-{llvm_version}"
+    print(f"DEBUG: Trying versioned: {path}")
     if await _check_tool_version(path, llvm_version, echo=echo):
+        print(f"DEBUG: Found at: {path}")
         return path
     # PCbuild externals:
     externals = os.environ.get("EXTERNALS_DIR", _targets.EXTERNALS)
     path = os.path.join(externals, _EXTERNALS_LLVM_TAG, "bin", tool)
+    print(f"DEBUG: Trying PCbuild externals: {path} (exists: {os.path.exists(path)})")
     if await _check_tool_version(path, llvm_version, echo=echo):
+        print(f"DEBUG: Found at: {path}")
         return path
     # Homebrew-installed executables:
     prefix = await _get_brew_llvm_prefix(llvm_version, echo=echo)