From: jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 18 Jul 2016 18:43:19 +0000 (+0000)
Subject: 	PR c++/71828
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=6fe424c2928bd86f0d55767fd785c65831a82c53;p=thirdparty%2Fgcc.git

	PR c++/71828
	* constexpr.c (cxx_eval_constant_expression) <case REALPART_EXPR>:
	For lval don't use cxx_eval_unary_expression and instead recurse
	and if needed rebuild the reference.

	* g++.dg/cpp0x/constexpr-71828.C: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@238442 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 899b2aeb6567..87d666e4930b 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,10 @@
 2016-07-18  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/71828
+	* constexpr.c (cxx_eval_constant_expression) <case REALPART_EXPR>:
+	For lval don't use cxx_eval_unary_expression and instead recurse
+	and if needed rebuild the reference.
+
 	PR c++/71826
 	* pt.c (tsubst_baselink): Only set BASELINK_OPTYPE for BASELINK_P.
 
diff --git a/gcc/cp/constexpr.c b/gcc/cp/constexpr.c
index cb8ece0773fe..91d14a55b4ff 100644
--- a/gcc/cp/constexpr.c
+++ b/gcc/cp/constexpr.c
@@ -3800,6 +3800,19 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
 
     case REALPART_EXPR:
     case IMAGPART_EXPR:
+      if (lval)
+	{
+	  r = cxx_eval_constant_expression (ctx, TREE_OPERAND (t, 0), lval,
+					    non_constant_p, overflow_p);
+	  if (r == error_mark_node)
+	    ;
+	  else if (r == TREE_OPERAND (t, 0))
+	    r = t;
+	  else
+	    r = fold_build1 (TREE_CODE (t), TREE_TYPE (t), r);
+	  break;
+	}
+      /* FALLTHRU */
     case CONJ_EXPR:
     case FIX_TRUNC_EXPR:
     case FLOAT_EXPR:
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 060fcebbf017..ff3e33573535 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2016-07-18  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/71828
+	* g++.dg/cpp0x/constexpr-71828.C: New test.
+
 	PR c++/71826
 	* g++.dg/template/pr71826.C: New test.
 
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-71828.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-71828.C
new file mode 100644
index 000000000000..b74cde965ff8
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-71828.C
@@ -0,0 +1,5 @@
+// PR c++/71828
+// { dg-do compile { target c++11 } }
+
+constexpr _Complex int a { 1, 2 };
+static_assert (& __imag a != &__real a, "");