Fixes a segfault in Tooling when using pch's:

Clear the FileManager's stat cache in between running
translation units, as the stat cache loaded from a pch
is only valid for one compiler invocation.

llvm-svn: 161047

1 files changed, 21 insertions, 0 deletions

diff --git a/clang/test/Tooling/pch.cpp b/clang/test/Tooling/pch.cpp
new file mode 100644
index 00000000000..bfa20d806b5
--- /dev/null
+++ b/clang/test/Tooling/pch.cpp
@@ -0,0 +1,21 @@
+// This is a regression test for handling of stat caches within the tooling
+// infrastructure. This test reproduces the problem under valgrind:
+
+// First, create a pch that we can later load. Loading the pch will insert
+// a stat cache into the FileManager:
+// RUN: %clang -x c++-header %S/Inputs/pch.h -o %t1
+
+// Use the generated pch and enforce a subsequent stat miss by by using
+// the test file with an unrelated include as second translation unit:
+// Do not directly pipe into FileCheck, as that would hide errors from
+// valgrind due to pipefail not being set in lit.
+// RUN: clang-check "%S/Inputs/pch.cpp" "%s" -- -include-pch %t1 -I "%S" -c >%t2 2>&1
+// RUN: FileCheck %s < %t2
+
+#include "Inputs/pch-fail.h"
+
+// CHECK: Processing
+
+// FIXME: This is incompatible to -fms-compatibility.
+// XFAIL: win32
+