ClangCheck is a small wrapper around LibTooling which can be used to do basic error checking and AST dumping.

$ cat <<EOF >
> void f() {
>   int a = 0
> }
$ ~/clang/build/bin/clang-check -ast-dump --
Processing: /Users/danieljasper/clang/llvm/tools/clang/docs/
/Users/danieljasper/clang/llvm/tools/clang/docs/ error: expected ';' at end of
  int a = 0
(TranslationUnitDecl 0x7ff3a3029ed0 <<invalid sloc>>
  (TypedefDecl 0x7ff3a302a410 <<invalid sloc>> __int128_t '__int128')
  (TypedefDecl 0x7ff3a302a470 <<invalid sloc>> __uint128_t 'unsigned __int128')
  (TypedefDecl 0x7ff3a302a830 <<invalid sloc>> __builtin_va_list '__va_list_tag [1]')
  (FunctionDecl 0x7ff3a302a8d0 </Users/danieljasper/clang/llvm/tools/clang/docs/, line:3:1> f 'void (void)'
    (CompoundStmt 0x7ff3a302aa10 <line:1:10, line:3:1>
      (DeclStmt 0x7ff3a302a9f8 <line:2:3, line:3:1>
        (VarDecl 0x7ff3a302a980 <line:2:3, col:11> a 'int'
          (IntegerLiteral 0x7ff3a302a9d8 <col:11> 'int' 0))))))
1 error generated.
Error while processing

The ‘–’ at the end is important as it prevents clang-check from searching for a compilation database. For more information on how to setup and use clang-check in a project, see How To Setup Clang Tooling For LLVM.