The problem here was that darwin uses CONST_DECL for an aggregate
constant, while the C++ front end expects it to only be used for
enumerators. Adjusting that in this one place fixes the testcase.
Tested x86_64-pc-linux-gnu, applying to trunk.
commit e7e659890bfa248aa57eefd62992a71d8d0bd399
Author: Jason Merrill <ja...@redhat.com>
Date: Thu Jan 22 16:58:01 2015 -0500
PR c++/64727
* constexpr.c (cxx_eval_constant_expression): Allow for lvalue use
of CONST_DECL.
diff --git a/gcc/cp/constexpr.c b/gcc/cp/constexpr.c
index e3e838e..3a33c9f 100644
--- a/gcc/cp/constexpr.c
+++ b/gcc/cp/constexpr.c
@@ -2955,10 +2955,11 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
return (*ctx->values->get (t));
case VAR_DECL:
+ case CONST_DECL:
+ /* We used to not check lval for CONST_DECL, but darwin.c uses
+ CONST_DECL for aggregate constants. */
if (lval)
return t;
- /* else fall through. */
- case CONST_DECL:
if (ctx->strict)
r = decl_really_constant_value (t);
else
