Enhancement to test for -ast-print

Present tests for the functionality provided by command lime option
`-ast-print` check only absence of crash. This change tries to make
testing better, - the output produced by the compiler is compiled again
with option `-print-ast` and both outputs are compared. Such test at
least checks that the output is valid code. This change fixes only the
test for pure C.

This is recommit of r285882.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@285981 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Coverage/ast-printing.c b/test/Coverage/ast-printing.c
index ecaf3abeaa8ae24e44f1bbf959d02b455c338705..eb22f92e66d72e247fb84ef7b9367a435d9be036 100644 (file)
--- a/test/Coverage/ast-printing.c
+++ b/test/Coverage/ast-printing.c
@@ -1,5 +1,7 @@
 // RUN: %clang_cc1 -fsyntax-only %s
-// RUN: %clang_cc1 -ast-print %s
+// RUN: %clang_cc1 -ast-print %s -o %t.1.c
+// RUN: %clang_cc1 -ast-print %t.1.c -o %t.2.c
+// RUN: diff %t.1.c %t.2.c
 // RUN: %clang_cc1 -ast-dump %s
 // RUN: %clang_cc1 -print-decl-contexts %s