re PR c++/57645 (Explicitly-declared destructor with no exception specification is always noexcept(true))

/cp
2013-06-28  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/57645
	* class.c (deduce_noexcept_on_destructors): Save, set, and restore
	TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) around the main loop over the
	destructors.

/testsuite
2013-06-28  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/57645
	* g++.dg/cpp0x/noexcept21.C: New.

From-SVN: r200559

4 files changed, 107 insertions, 3 deletions

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index cffed31..c00f24c 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,10 @@
+2013-06-28  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/57645
+	* class.c (deduce_noexcept_on_destructors): Save, set, and restore
+	TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) around the main loop over the
+	destructors.
+
 2013-06-28  Balaji V. Iyer  <balaji.v.iyer@intel.com>
 
 	* parser.c (cp_parser_array_notation): Removed rejection array notation
diff --git a/gcc/cp/class.c b/gcc/cp/class.c
index 0067605..bb2c3fe 100644
--- a/gcc/cp/class.c
+++ b/gcc/cp/class.c
@@ -4593,15 +4593,20 @@ deduce_noexcept_on_destructor (tree dtor)
 static void
 deduce_noexcept_on_destructors (tree t)
 {
-  tree fns;
-
   /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail
      out now.  */
   if (!CLASSTYPE_METHOD_VEC (t))
     return;
 
-  for (fns = CLASSTYPE_DESTRUCTORS (t); fns; fns = OVL_NEXT (fns))
+  bool saved_nontrivial_dtor = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t);
+
+  /* Avoid early exit from synthesized_method_walk (c++/57645).  */
+  TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = true;
+
+  for (tree fns = CLASSTYPE_DESTRUCTORS (t); fns; fns = OVL_NEXT (fns))
     deduce_noexcept_on_destructor (OVL_CURRENT (fns));
+
+  TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = saved_nontrivial_dtor;
 }
 
 /* Subroutine of set_one_vmethod_tm_attributes.  Search base classes
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 28874b0..1ab4a98 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2013-06-28  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/57645
+	* g++.dg/cpp0x/noexcept21.C: New.
+
 2013-06-28  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/57736
diff --git a/gcc/testsuite/g++.dg/cpp0x/noexcept21.C b/gcc/testsuite/g++.dg/cpp0x/noexcept21.C
new file mode 100644
index 0000000..ec88e1d
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/noexcept21.C
@@ -0,0 +1,87 @@
+// PR c++/57645
+// { dg-do compile { target c++11 } }
+
+struct Thrower
+{
+  ~Thrower() noexcept(false) { throw 1; }
+};
+
+struct ExplicitA
+{
+  ~ExplicitA() {}
+
+  Thrower t;
+};
+
+struct ExplicitB
+{
+  ~ExplicitB();
+
+  Thrower t;
+};
+
+ExplicitB::~ExplicitB() {}
+
+struct ExplicitC
+{
+  ~ExplicitC() = default;
+
+  Thrower t;
+};
+
+struct ExplicitD
+{
+  ~ExplicitD();
+
+  Thrower t;
+};
+
+ExplicitD::~ExplicitD() = default;
+
+struct NoThrower
+{
+  ~NoThrower() noexcept(true) {}
+};
+
+struct ExplicitE
+{
+  ~ExplicitE() {}
+
+  NoThrower t;
+};
+
+struct ExplicitF
+{
+  ~ExplicitF();
+
+  NoThrower t;
+};
+
+ExplicitF::~ExplicitF() {}
+
+struct ExplicitG
+{
+  ~ExplicitG() = default;
+
+  NoThrower t;
+};
+
+struct ExplicitH
+{
+  ~ExplicitH();
+
+  NoThrower t;
+};
+
+ExplicitH::~ExplicitH() = default;
+
+#define SA(X) static_assert(X, #X)
+
+SA( !noexcept(ExplicitA()) );
+SA( !noexcept(ExplicitB()) );
+SA( !noexcept(ExplicitC()) );
+SA( !noexcept(ExplicitD()) );
+SA( noexcept(ExplicitE()) );
+SA( noexcept(ExplicitF()) );
+SA( noexcept(ExplicitG()) );
+SA( noexcept(ExplicitH()) );