[PCH] Be conservative and check all the files the PCH references to see if
a file was modified since the time the PCH was created.
The parser is not fit to deal with stale PCHs, too many invariants do not hold up. rdar://9530587.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@132389 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/PCH/modified-header-error.c b/test/PCH/modified-header-error.c
new file mode 100644
index 0000000..6335fb1
--- /dev/null
+++ b/test/PCH/modified-header-error.c
@@ -0,0 +1,11 @@
+// RUN: mkdir -p %t.dir
+// RUN: echo '#include "header2.h"' > %t.dir/header1.h
+// RUN: echo > %t.dir/header2.h
+// RUN: cp %s %t.dir/t.c
+// RUN: %clang_cc1 -x c-header %t.dir/header1.h -emit-pch -o %t.pch
+// RUN: echo >> %t.dir/header2.h
+// RUN: %clang_cc1 %t.dir/t.c -include-pch %t.pch -fsyntax-only 2>&1 | FileCheck %s
+
+#include "header2.h"
+
+// CHECK: fatal error: file {{.*}} has been modified since the precompiled header was built