re PR c++/44148 (C++ genericization/gimplification may clobber templare arguments)

	PR c++/44148
	* pt.c (tsubst): Unshare template argument.

	* g++.dg/torture/pr44148.C: New test.

From-SVN: r159443

gcc/cp/ChangeLog

+2010-05-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/44148
+	* pt.c (tsubst): Unshare template argument.
+
 2010-05-15  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* decl.c: Include tree-iterator.h, as fixup for tree-inline.h changes.

gcc/cp/pt.c

@@ -10150,7 +10150,7 @@ tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 	      }
 	    else
 	      /* TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX.  */
-	      return arg;
+	      return unshare_expr (arg);
 	  }
 
 	if (level == 1)

gcc/testsuite/ChangeLog

+2010-05-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/44148
+	* g++.dg/torture/pr44148.C: New test.
+
 2010-05-15  Joseph Myers  <joseph@codesourcery.com>
 
 	* gcc.dg/c1x-anon-struct-1.c, gcc.dg/c1x-anon-struct-2.c,

gcc/testsuite/g++.dg/torture/pr44148.C

+// PR c++/44148
+// { dg-do compile }
+// { dg-options "" }
+// { dg-options "-fpic" { target fpic } }
+
+template <typename T> struct S2
+{
+  typedef const T &t2;
+  t2 operator* () const {}
+};
+template <typename T> struct S3
+{
+  typedef S2 <T> t5;
+};
+template <typename T1, typename T2> T2 foo1 (T1 x, T2 y) { y (*x); }
+template <class T> struct S4
+{
+  T &operator* () const;
+};
+struct S7 {};
+struct S8
+{
+  typedef::S3 <S4 <S7> >::t5 t6;
+  t6 m1 () const;
+};
+template <class T> struct S9
+{
+  typedef T t3;
+  inline t3 &operator[] (unsigned int) {}
+};
+template <typename T1, typename T2, typename T3, void (&T4) (const T1 &, T3 &)> struct S10
+{
+  S10 (T2 &x, unsigned int y = 0) : u (x), v (y) {}
+  void operator () (const S4 <T1> &x) { T4 (*x, u[v++]); }
+  T2 &u;
+  unsigned int v;
+};
+struct S15;
+struct S11
+{
+  static void m3 (const S8 &, S15 &);
+};
+struct S16;
+struct S12;
+struct S13
+{
+  static void m4 (const S7 &,S16 &);
+};
+typedef S10 <S7, S12, S16, S13::m4> t10;
+struct S12: S9 <S16>
+{
+};
+struct S15
+{
+  S12 p;
+};
+void S11::m3 (const S8 &x, S15 &y)
+{
+  foo1 (x.m1 (), t10 (y.p));
+}