public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [Bug c++/66586] New: Template backtrace is truncated/absent after 'template argument deduction/substitution failed:'
@ 2015-06-18 12:52 lucdanton at free dot fr
2015-06-18 12:59 ` [Bug c++/66586] " redi at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: lucdanton at free dot fr @ 2015-06-18 12:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66586
Bug ID: 66586
Summary: Template backtrace is truncated/absent after 'template
argument deduction/substitution failed:'
Product: gcc
Version: 5.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lucdanton at free dot fr
Target Milestone: ---
Created attachment 35801
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35801&action=edit
Minimal testcase
I've noticed that sometimes GCC presents e.g.
> main.cpp:8:25: note: template argument deduction/substitution failed:
but then entirely omits the template instantiation backtrace. I've had a hard
time reproducing it so far but I finally found an example. Also happens with
4.9.2. Unrolling the result template alias by hand into the return type of foo
produces the expected behaviour, with a backtrace pointing to the mistake.
$ g++-trunk --version
g++-trunk (GCC) 5.1.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ cat main.cpp
template<typename>
struct trivial { using type = int; };
template<typename... Xs>
using result = typename trivial<Xs...>::type;
template<typename... Xs>
constexpr result<Xs...> foo(Xs...)
{ return 0; }
int main()
{
foo(0, 0);
}
$ g++-trunk -std=c++11 main.cpp
main.cpp: In function 'int main()':
main.cpp:13:13: error: no matching function for call to 'foo(int, int)'
foo(0, 0);
^
main.cpp:8:25: note: candidate: template<class ... Xs> constexpr result<Xs ...>
foo(Xs ...)
constexpr result<Xs...> foo(Xs...)
^
main.cpp:8:25: note: template argument deduction/substitution failed:
$ #prompt resumes here!
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/66586] Template backtrace is truncated/absent after 'template argument deduction/substitution failed:' 2015-06-18 12:52 [Bug c++/66586] New: Template backtrace is truncated/absent after 'template argument deduction/substitution failed:' lucdanton at free dot fr @ 2015-06-18 12:59 ` redi at gcc dot gnu.org 2015-08-04 15:11 ` paolo.carlini at oracle dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: redi at gcc dot gnu.org @ 2015-06-18 12:59 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66586 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |diagnostic Status|UNCONFIRMED |NEW Last reconfirmed| |2015-06-18 Ever confirmed|0 |1 --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- I've seen this many times but never distilled it down. Thanks for the testcase. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/66586] Template backtrace is truncated/absent after 'template argument deduction/substitution failed:' 2015-06-18 12:52 [Bug c++/66586] New: Template backtrace is truncated/absent after 'template argument deduction/substitution failed:' lucdanton at free dot fr 2015-06-18 12:59 ` [Bug c++/66586] " redi at gcc dot gnu.org @ 2015-08-04 15:11 ` paolo.carlini at oracle dot com 2024-04-06 23:16 ` pinskia at gcc dot gnu.org 2024-04-06 23:16 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: paolo.carlini at oracle dot com @ 2015-08-04 15:11 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66586 --- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> --- Happens in c++/66439 too. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/66586] Template backtrace is truncated/absent after 'template argument deduction/substitution failed:' 2015-06-18 12:52 [Bug c++/66586] New: Template backtrace is truncated/absent after 'template argument deduction/substitution failed:' lucdanton at free dot fr 2015-06-18 12:59 ` [Bug c++/66586] " redi at gcc dot gnu.org 2015-08-04 15:11 ` paolo.carlini at oracle dot com @ 2024-04-06 23:16 ` pinskia at gcc dot gnu.org 2024-04-06 23:16 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2024-04-06 23:16 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66586 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Known to work| |9.1.0 Status|NEW |RESOLVED Known to fail| |8.5.0 Resolution|--- |DUPLICATE --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Dup. *** This bug has been marked as a duplicate of bug 56842 *** ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/66586] Template backtrace is truncated/absent after 'template argument deduction/substitution failed:' 2015-06-18 12:52 [Bug c++/66586] New: Template backtrace is truncated/absent after 'template argument deduction/substitution failed:' lucdanton at free dot fr ` (2 preceding siblings ...) 2024-04-06 23:16 ` pinskia at gcc dot gnu.org @ 2024-04-06 23:16 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2024-04-06 23:16 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66586 --- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #4) > Dup. > > *** This bug has been marked as a duplicate of bug 56842 *** I should dup and fixed in GCC 9.1.0. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-04-06 23:16 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2015-06-18 12:52 [Bug c++/66586] New: Template backtrace is truncated/absent after 'template argument deduction/substitution failed:' lucdanton at free dot fr 2015-06-18 12:59 ` [Bug c++/66586] " redi at gcc dot gnu.org 2015-08-04 15:11 ` paolo.carlini at oracle dot com 2024-04-06 23:16 ` pinskia at gcc dot gnu.org 2024-04-06 23:16 ` pinskia at gcc dot gnu.org
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).