Add reduced test case for a common lookup failure.

This is reduced from the standard library.  The type mbstate_t is
declared in the global scope and then incorporated into 'std' via

When the header doing this is converted into a PPH image, the lookup
for identifier 'mbstate_t' produces the USING_DECL instead of the
TYPE_DECL in the global scope.

This causes the parser to segfault while parsing 'typedef
std::mbstate_t state_type' in the user of that PPH image.

Working on a fix shortly.

2012-03-20   Diego Novillo  <>

        * g++.dg/pph/x0mbstate_t.h: New.
        * g++.dg/pph/x1mbstate_t.h: New.

diff --git a/gcc/testsuite/g++.dg/pph/x0mbstate_t.h 
new file mode 100644
index 0000000..dceb3e4
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pph/x0mbstate_t.h
@@ -0,0 +1,10 @@
+#ifndef _X0_MBSTATE_T_H
+#define _X0_MBSTATE_T_H
+typedef int mbstate_t;
+namespace std
+  using ::mbstate_t;
diff --git a/gcc/testsuite/g++.dg/pph/x1mbstate_t.h 
new file mode 100644
index 0000000..c07a0cc
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pph/x1mbstate_t.h
@@ -0,0 +1,9 @@
+// { dg-xfail-if "identifier bindings not set properly" { "*-*-*" } { 
""} }
+// { dg-bogus ".*Segmentation fault" "ICE trying to parse std::mbstate_t"  { 
xfail *-*-* } 0 }
+#ifndef _X1_MBSTATE_H
+#define _X1_MBSTATE_H
+#include "x0mbstate_t.h"
+// Name lookup for std::mbstate_t fails here.  Instead of returning the global
+// type_decl for mbstate_t, it returns the "usings ::mbstate_t" declaration.
+typedef std::mbstate_t state_type;

This patch is available for review at

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