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C++ PATCH for c++/84752, ICE with capture of constexpr array
- From: Jason Merrill <jason at redhat dot com>
- To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 9 Mar 2018 22:33:11 -0500
- Subject: C++ PATCH for c++/84752, ICE with capture of constexpr array
- Authentication-results: sourceware.org; auth=none
Another case where we need to set a flag on the ck_identity conversion
so that we don't mistakenly pull out the constant value of something
that we want the address of.
Tested x86_64-pc-linux-gnu, applying to trunk.
commit 493898f505c4b38145356ef3b51dd986312497a8
Author: Jason Merrill <jason@redhat.com>
Date: Fri Mar 9 17:14:04 2018 -0500
PR c++/84752 - ICE with capture of constexpr array.
* call.c (standard_conversion): Set rvaluedness_matches_p on the
identity conversion under ck_lvalue.
diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 17cd1c4f63e..45c22aaa312 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -103,7 +103,7 @@ struct conversion {
being bound to an rvalue expression. If KIND is ck_rvalue,
true when we are treating an lvalue as an rvalue (12.8p33). If
KIND is ck_base, always false. If ck_identity, we will be
- binding a reference directly. */
+ binding a reference directly or decaying to a pointer. */
BOOL_BITFIELD rvaluedness_matches_p: 1;
BOOL_BITFIELD check_narrowing: 1;
/* The type of the expression resulting from the conversion. */
@@ -1139,6 +1139,8 @@ standard_conversion (tree to, tree from, tree expr, bool c_cast_p,
{
from = type_decays_to (from);
fcode = TREE_CODE (from);
+ /* Tell convert_like_real that we're using the address. */
+ conv->rvaluedness_matches_p = true;
conv = build_conv (ck_lvalue, from, conv);
}
/* Wrapping a ck_rvalue around a class prvalue (as a result of using
diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-array3.C b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-array3.C
new file mode 100644
index 00000000000..09711033511
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-array3.C
@@ -0,0 +1,9 @@
+// PR c++/84752
+// { dg-do compile { target c++11 } }
+
+void foo()
+{
+ constexpr int x[1] = {};
+ [&x]{ return (bool)x; };
+}
+