RUN: echo a > %t.cpp

CHECK: unknown type name 'X'

check adding compiler cflags
RUN: clang-diff -ast-dump -extra-arg=-Da=X        %t.cpp -- 2>&1 | FileCheck %s
RUN: clang-diff -ast-dump -extra-arg-before=-Da=X %t.cpp -- 2>&1 | FileCheck %s
RUN: clang-diff -ast-dump %t.cpp -- 2>&1 -Da=X | FileCheck %s

NOMATCH-CHECK-NOT: {{.}}
RUN: clang-diff %S/clang-diff-ast.cpp %S/clang-diff-ast.cpp -- 2>&1 -std=c++11 \
RUN: | FileCheck -check-prefix=NOMATCH-CHECK -allow-empty %s