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* [Bug c++/60177] New: Unable to deduce template base of derived class in function template accepting a simple-template-id
@ 2014-02-13 14:38 filip.roseen at gmail dot com
2014-02-14 10:19 ` [Bug c++/60177] Unable to deduce template base of derived class in call to function taking a `simple-template-id` filip.roseen at gmail dot com
2014-12-14 14:14 ` ville.voutilainen at gmail dot com
0 siblings, 2 replies; 3+ messages in thread
From: filip.roseen at gmail dot com @ 2014-02-13 14:38 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60177
Bug ID: 60177
Summary: Unable to deduce template base of derived class in
function template accepting a simple-template-id
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: filip.roseen at gmail dot com
template<class> struct Base { };
struct Derived : Base<void> { };
template<template<typename> class TT, typename T>
void func (TT<T>) { }
int main () {
func (Derived { });
}
- - - - - - - - - - - - - - - - - - - - - - - - - -
main.cpp: In function 'int main()':
main.cpp:9:20: error: no matching function for call to 'func(Derived)'
func (Derived { });
^
main.cpp:9:20: note: candidate is:
main.cpp:6:6: note: template<template<class> class TT, class T> void
func(TT<T>)
void func (TT<T>) { }
^
main.cpp:6:6: note: template argument deduction/substitution failed:
main.cpp:9:20: note: can't deduce a template for 'TT<T>' from non-template
type 'Derived'
func (Derived { });
- - - - - - - - - - - - - - - - - - - - - - - - - -
gcc rejects the snippet which is a violation of [temp.deduct.call]/4 (`clang`
and `msvc` accepts the code).
`TT<T>` is a `simple-template-id` and the standard says that if a derived type
is passed to such context it should be deduced to a suitable base of that
passed type.
Correct behavior is that the deduced template parameters for `func (Derived
{})` should be `TT = Base, T = void`.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/60177] Unable to deduce template base of derived class in call to function taking a `simple-template-id`
2014-02-13 14:38 [Bug c++/60177] New: Unable to deduce template base of derived class in function template accepting a simple-template-id filip.roseen at gmail dot com
@ 2014-02-14 10:19 ` filip.roseen at gmail dot com
2014-12-14 14:14 ` ville.voutilainen at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: filip.roseen at gmail dot com @ 2014-02-14 10:19 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60177
--- Comment #1 from Filip Roséen <filip.roseen at gmail dot com> ---
Created attachment 32133
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32133&action=edit
testcase.cpp
>From gcc-bugs-return-443544-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Feb 14 10:21:23 2014
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From: "ktietz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/60193] [4.7.4/4.8/4.9 regression] ICE on big nested frame
Date: Fri, 14 Feb 2014 10:21:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 4.7.4
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X-Bugzilla-Who: ktietz at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Priority: P3
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Message-ID: <bug-60193-4-S04VdIngxB@http.gcc.gnu.org/bugzilla/>
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`193
Kai Tietz <ktietz at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |ASSIGNED
--- Comment #4 from Kai Tietz <ktietz at gcc dot gnu.org> ---
Confirmed. It seems to be related to array-size?!?
During debugging I found that r10 seems to live, and rax doesn't. I will look
into it.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/60177] Unable to deduce template base of derived class in call to function taking a `simple-template-id`
2014-02-13 14:38 [Bug c++/60177] New: Unable to deduce template base of derived class in function template accepting a simple-template-id filip.roseen at gmail dot com
2014-02-14 10:19 ` [Bug c++/60177] Unable to deduce template base of derived class in call to function taking a `simple-template-id` filip.roseen at gmail dot com
@ 2014-12-14 14:14 ` ville.voutilainen at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: ville.voutilainen at gmail dot com @ 2014-12-14 14:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60177
Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2014-12-14
CC| |ville.voutilainen at gmail dot com
Ever confirmed|0 |1
Known to fail| |4.8.2, 4.9.1, 5.0
--- Comment #2 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Clang accepts the code.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-02-13 14:38 [Bug c++/60177] New: Unable to deduce template base of derived class in function template accepting a simple-template-id filip.roseen at gmail dot com
2014-02-14 10:19 ` [Bug c++/60177] Unable to deduce template base of derived class in call to function taking a `simple-template-id` filip.roseen at gmail dot com
2014-12-14 14:14 ` ville.voutilainen at gmail dot com
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