re PR c++/83897 (Useless __builtin_unreachable () emitted by the C++ FE)

	PR c++/83897
	* cp-gimplify.c (cp_maybe_instrument_return): Handle
	CLEANUP_POINT_EXPR.

	* g++.dg/cpp0x/pr83897.C: New test.

From-SVN: r256819

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 17b4192..0d73c5b 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2018-01-17  Jakub Jelinek  <jakub@redhat.com>
+
+       PR c++/83897
+       * cp-gimplify.c (cp_maybe_instrument_return): Handle
+       CLEANUP_POINT_EXPR.
+
 2018-01-17  Paolo Carlini  <paolo.carlini@oracle.com>
 
        PR c++/81054

diff --git a/gcc/cp/cp-gimplify.c b/gcc/cp/cp-gimplify.c
index e97247c..2185925 100644 (file)
--- a/gcc/cp/cp-gimplify.c
+++ b/gcc/cp/cp-gimplify.c
@@ -1581,6 +1581,7 @@ cp_maybe_instrument_return (tree fndecl)
          t = BIND_EXPR_BODY (t);
          continue;
        case TRY_FINALLY_EXPR:
+       case CLEANUP_POINT_EXPR:
          t = TREE_OPERAND (t, 0);
          continue;
        case STATEMENT_LIST:

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index fb0e919..96495d9 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-01-17  Jakub Jelinek  <jakub@redhat.com>
+
+       PR c++/83897
+       * g++.dg/cpp0x/pr83897.C: New test.
+
 2018-01-17  Jan Hubicka  <hubicka@ucw.cz>
 
        PR ipa/83051

diff --git a/gcc/testsuite/g++.dg/cpp0x/pr83897.C b/gcc/testsuite/g++.dg/cpp0x/pr83897.C
new file mode 100644 (file)
index 0000000..26a37d1
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/pr83897.C
@@ -0,0 +1,13 @@
+// PR c++/83897
+// { dg-do compile { target c++11 } }
+// { dg-options "-O2 -fdump-tree-gimple" }
+// { dg-final { scan-tree-dump-not "__builtin_unreachable" "gimple" } }
+
+struct A {};
+struct B { int a; int b = 5; };
+
+A
+bar (B)
+{
+  return {};
+}