[Help] How to get error info from libtooling?

[Douglas Chen]

clang file.c -x c++ -Xclang -ast-dump -fsyntax-only

#define MAX_VALUE (10)  
int iVal1 =             
int iVal2 = MAX_VALUE;  

file.c:3:1: error: expected expression
int iVal2 = MAX_VALUE;
^
TranslationUnitDecl 0x21bb4965f08 <<invalid sloc>> <invalid sloc>
|-TypedefDecl 0x21bb49667a0 <<invalid sloc>> <invalid sloc> implicit __int128_t '__int128'
| `-BuiltinType 0x21bb49664a0 '__int128'
|-TypedefDecl 0x21bb4966810 <<invalid sloc>> <invalid sloc> implicit __uint128_t 'unsigned __int128'
| `-BuiltinType 0x21bb49664c0 'unsigned __int128'
|-TypedefDecl 0x21bb4966b18 <<invalid sloc>> <invalid sloc> implicit __NSConstantString 'struct __NSConstantString_tag'
| `-RecordType 0x21bb49668f0 'struct __NSConstantString_tag'
|   `-Record 0x21bb4966868 '__NSConstantString_tag'
|-TypedefDecl 0x21bb4966b88 <<invalid sloc>> <invalid sloc> implicit size_t 'unsigned long long'
| `-BuiltinType 0x21bb49660e0 'unsigned long long'
|-TypedefDecl 0x21bb4966c20 <<invalid sloc>> <invalid sloc> implicit __builtin_ms_va_list 'char *'
| `-PointerType 0x21bb4966be0 'char *'
|   `-BuiltinType 0x21bb4965fa0 'char'
|-TypedefDecl 0x21bb4966c90 <<invalid sloc>> <invalid sloc> implicit __builtin_va_list 'char *'
| `-PointerType 0x21bb4966be0 'char *'
|   `-BuiltinType 0x21bb4965fa0 'char'
`-VarDecl 0x21bb4966d00 <file.c:2:1, col:5> col:5 iVal1 'int'
1 error generated.
PS D:\>