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C++ PATCH for c++/50034 (wrong error on passing to ... in unevaluated context)
- From: Jason Merrill <jason at redhat dot com>
- To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 12 Aug 2011 17:24:07 -0400
- Subject: C++ PATCH for c++/50034 (wrong error on passing to ... in unevaluated context)
G++ was complaining about performing the lvalue-rvalue conversion on an
lvalue of abstract type, which is correct when the conversion is
potentially evaluated, but as it turns out, not in unevaluated context.
Tested x86_64-pc-linux-gnu, applying to trunk.
commit 28e405968ae794fcb73d2946a6c83bde167cc2ae
Author: Jason Merrill <jason@redhat.com>
Date: Fri Aug 12 00:37:14 2011 -0400
PR c++/50034
* call.c (convert_arg_to_ellipsis): force_rvalue only in
potentially evaluated context.
diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index a3b0f8a..e8fb68d 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -6097,7 +6097,7 @@ convert_arg_to_ellipsis (tree arg)
{
/* Build up a real lvalue-to-rvalue conversion in case the
copy constructor is trivial but not callable. */
- if (CLASS_TYPE_P (arg_type))
+ if (!cp_unevaluated_operand && CLASS_TYPE_P (arg_type))
force_rvalue (arg, tf_warning_or_error);
/* [expr.call] 5.2.2/7:
diff --git a/gcc/testsuite/g++.dg/cpp0x/defaulted28.C b/gcc/testsuite/g++.dg/cpp0x/defaulted28.C
index 15caef6..bcbf763 100644
--- a/gcc/testsuite/g++.dg/cpp0x/defaulted28.C
+++ b/gcc/testsuite/g++.dg/cpp0x/defaulted28.C
@@ -1,4 +1,5 @@
// PR c++/49102
+// PR c++/50034
// { dg-options -std=c++0x }
struct A {
@@ -8,8 +9,9 @@ private:
A(A const&) = default; // { dg-error "private" }
};
-void f(...) { }
+int f(...) { }
int main() {
A a;
f(a); // { dg-error "this context" }
+ sizeof(f(a)); // OK because unevaluated
}