--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/PCH/changed-files.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,28 @@
+const char *s0 = m0;
+int s1 = m1;
+const char *s2 = m0;
+
+// FIXME: This test fails inexplicably on Windows in a manner that makes it 
+// look like standard error isn't getting flushed properly.
+
+// RUN: false
+// XFAIL: *
+
+// RUN: echo '#define m0 ""' > %t.h
+// RUN: %clang_cc1 -emit-pch -o %t.h.pch %t.h
+// RUN: echo '' > %t.h
+// RUN: not %clang_cc1 -include-pch %t.h.pch %s 2> %t.stderr
+// RUN: grep "modified" %t.stderr
+
+// RUN: echo '#define m0 000' > %t.h
+// RUN: %clang_cc1 -emit-pch -o %t.h.pch %t.h
+// RUN: echo '' > %t.h
+// RUN: not %clang_cc1 -include-pch %t.h.pch %s 2> %t.stderr
+// RUN: grep "modified" %t.stderr
+
+// RUN: echo '#define m0 000' > %t.h
+// RUN: echo "#define m1 'abcd'" >> %t.h
+// RUN: %clang_cc1 -emit-pch -o %t.h.pch %t.h
+// RUN: echo '' > %t.h
+// RUN: not %clang_cc1 -include-pch %t.h.pch %s 2> %t.stderr
+// RUN: grep "modified" %t.stderr