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-rw-r--r--gcc/cp/ChangeLog6
-rw-r--r--gcc/cp/decl.c4
2 files changed, 9 insertions, 1 deletions
diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 09dc2b1..71fba75 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2018-03-13 Paolo Carlini <paolo.carlini@oracle.com>
+ Jason Merrill <jason@redhat.com>
+
+ PR c++/82336 - link error with list-init default argument.
+ * decl.c (check_default_argument): Unshare an initializer list.
+
2018-03-13 Jakub Jelinek <jakub@redhat.com>
PR c++/84843
diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index ff6dd66..45daccd 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -12668,7 +12668,9 @@ check_default_argument (tree decl, tree arg, tsubst_flags_t complain)
A default argument expression is implicitly converted to the
parameter type. */
++cp_unevaluated_operand;
- perform_implicit_conversion_flags (decl_type, arg, complain,
+ /* Avoid digest_init clobbering the initializer. */
+ tree carg = BRACE_ENCLOSED_INITIALIZER_P (arg) ? unshare_expr (arg): arg;
+ perform_implicit_conversion_flags (decl_type, carg, complain,
LOOKUP_IMPLICIT);
--cp_unevaluated_operand;