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PR c++/60531 - Wrong error about unresolved overloaded function 

For PR60531, GCC wrongly rejects function templates with explicitly
specified template arguments as overloaded. They are resolved by
resolve_nondeduced_context, which is normally called by
cp_default_conversion through decay_conversion, but the latter have
extra effects making them unusable here. Calling the former directly
does work.

	* typeck.c (cp_build_binary_op): See if overload can be resolved.
	(cp_build_unary_op): Ditto.

	* g++.dg/template/operator15.C: New test.

From-SVN: r271910
This commit is contained in:
Harald van Dijk 2019-06-04 16:48:38 +02:00 committed by Jason Merrill
parent ecdcd56094
commit 7b9202ea9e
3 changed files with 19 additions and 5 deletions
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6
gcc/cp/ChangeLog
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@ -1,3 +1,9 @@
2019-06-04 Harald van Dijk <harald@gigawatt.nl>
PR c++/60531 - Wrong error about unresolved overloaded function
* typeck.c (cp_build_binary_op): See if overload can be resolved.
(cp_build_unary_op): Ditto.
2019-06-04 Jason Merrill <jason@redhat.com>
Reduce accumulated garbage in constexpr evaluation.

12
gcc/cp/typeck.c
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@ -4396,10 +4396,6 @@ cp_build_binary_op (const op_location_t &location,
/* True if both operands have arithmetic type. */
bool arithmetic_types_p;
/* Apply default conversions. */
op0 = orig_op0;
op1 = orig_op1;
/* Remember whether we're doing / or %. */
bool doing_div_or_mod = false;
@ -4409,6 +4405,10 @@ cp_build_binary_op (const op_location_t &location,
/* Tree holding instrumentation expression. */
tree instrument_expr = NULL_TREE;
/* Apply default conversions. */
op0 = resolve_nondeduced_context (orig_op0, complain);
op1 = resolve_nondeduced_context (orig_op1, complain);
if (code == TRUTH_AND_EXPR || code == TRUTH_ANDIF_EXPR
|| code == TRUTH_OR_EXPR || code == TRUTH_ORIF_EXPR
|| code == TRUTH_XOR_EXPR)
@ -6216,11 +6216,13 @@ cp_build_unary_op (enum tree_code code, tree xarg, bool noconvert,
if (!arg || error_operand_p (arg))
return error_mark_node;
arg = resolve_nondeduced_context (arg, complain);
if ((invalid_op_diag
= targetm.invalid_unary_op ((code == UNARY_PLUS_EXPR
? CONVERT_EXPR
: code),
TREE_TYPE (xarg))))
TREE_TYPE (arg))))
{
if (complain & tf_error)
error (invalid_op_diag);

6
gcc/testsuite/g++.dg/template/operator15.C Normal file
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@ -0,0 +1,6 @@
// PR c++/60531
template < class T > T foo ();
bool b1 = foo<int> == foo<int>;
int (*fp1)() = +foo<int>;