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* [Bug c++/95559] New: Compiling "{{}}" result is inconsistent in different versions
@ 2020-06-06 4:11 haoxintu at gmail dot com
2020-06-09 22:41 ` [Bug c++/95559] GCC fails to compile "{{}}" in some versions mpolacek at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: haoxintu at gmail dot com @ 2020-06-06 4:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95559
Bug ID: 95559
Summary: Compiling "{{}}" result is inconsistent in different
versions
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: haoxintu at gmail dot com
Target Milestone: ---
This case test.cc
#include<iostream>
int main() {
return {{}};
}
In the version of GCC 6.1 - 8.4, it's compiled ok.
But in GCC 6.1 lower and 8.4 higher version, for example, in GCC trunk
$g++-trunk test.cc
test.cc: In function 'int main()':
test.cc:3:15: error: too many braces around scalar initializer for type 'int'
3 | int var = {{}};
|
I also compiled test.cc in recent released Clang, and they all accept "{{}}".
Should GCC compile "{{}}" fine also? I think this is a supported feature
according to https://en.cppreference.com/w/cpp/language/return.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/95559] GCC fails to compile "{{}}" in some versions
2020-06-06 4:11 [Bug c++/95559] New: Compiling "{{}}" result is inconsistent in different versions haoxintu at gmail dot com
@ 2020-06-09 22:41 ` mpolacek at gcc dot gnu.org
2020-06-09 23:36 ` haoxintu at gmail dot com
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2020-06-09 22:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95559
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I can't find a version of GCC that compiled this. And clang++ emits a warning:
warning: too many braces around scalar initializer
[-Wmany-braces-around-scalar-init]
I don't think this is rejects-valid.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/95559] GCC fails to compile "{{}}" in some versions
2020-06-06 4:11 [Bug c++/95559] New: Compiling "{{}}" result is inconsistent in different versions haoxintu at gmail dot com
2020-06-09 22:41 ` [Bug c++/95559] GCC fails to compile "{{}}" in some versions mpolacek at gcc dot gnu.org
@ 2020-06-09 23:36 ` haoxintu at gmail dot com
2020-06-09 23:39 ` haoxintu at gmail dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: haoxintu at gmail dot com @ 2020-06-09 23:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95559
--- Comment #2 from Haoxin Tu <haoxintu at gmail dot com> ---
(In reply to Marek Polacek from comment #1)
> I can't find a version of GCC that compiled this.
Hi, so sorry I might use the wrong test case. Please try this case bug.cc
instead
#include <iostream>
int main(){
int a = {{}};
std::cout << a << std::endl;
return 0;
}
In godbolt https://godbolt.org/z/K_drKC .
Also, in my machine,
$g++-8 test.cc ; ./a.out
0
$g++-8 --version
g++-8 (Ubuntu 8.4.0-1ubuntu1~18.04) 8.4.0
Copyright (C) 2018 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.
$g++-trunk bug.cc
bug.cc: In function ‘int main()’:
bug.cc:3:16: error: too many braces around scalar initializer for type ‘int’
3 | int a = {{}};
|
$g++-trunk --version
g++ (GCC) 11.0.0 20200526 (experimental)
Copyright (C) 2020 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.
> I don't think this is rejects-valid.
I guess clang might have some issue in compiling "{{}}", clang accepts this
code but icc or msvc reject.
Please take a look at above situation, thanks ~
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/95559] GCC fails to compile "{{}}" in some versions
2020-06-06 4:11 [Bug c++/95559] New: Compiling "{{}}" result is inconsistent in different versions haoxintu at gmail dot com
2020-06-09 22:41 ` [Bug c++/95559] GCC fails to compile "{{}}" in some versions mpolacek at gcc dot gnu.org
2020-06-09 23:36 ` haoxintu at gmail dot com
@ 2020-06-09 23:39 ` haoxintu at gmail dot com
2020-06-10 13:26 ` [Bug c++/95559] GCC accepts "too many braces around scalar initializer " in the version of 6.1 - 8.4 mpolacek at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: haoxintu at gmail dot com @ 2020-06-09 23:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95559
--- Comment #3 from Haoxin Tu <haoxintu at gmail dot com> ---
(In reply to Haoxin Tu from comment #2)
> $g++-8 test.cc ; ./a.out
> 0
Here is
> $g++-8 bug.cc ; ./a.out
> 0
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/95559] GCC accepts "too many braces around scalar initializer " in the version of 6.1 - 8.4
2020-06-06 4:11 [Bug c++/95559] New: Compiling "{{}}" result is inconsistent in different versions haoxintu at gmail dot com
` (2 preceding siblings ...)
2020-06-09 23:39 ` haoxintu at gmail dot com
@ 2020-06-10 13:26 ` mpolacek at gcc dot gnu.org
2020-06-10 13:33 ` haoxintu at gmail dot com
2020-06-10 13:34 ` mpolacek at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2020-06-10 13:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95559
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
That's the same case, initializing an int with {{}}. GCC 8 compiled the second
testcase, but that was fixed in r269045.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/95559] GCC accepts "too many braces around scalar initializer " in the version of 6.1 - 8.4
2020-06-06 4:11 [Bug c++/95559] New: Compiling "{{}}" result is inconsistent in different versions haoxintu at gmail dot com
` (3 preceding siblings ...)
2020-06-10 13:26 ` [Bug c++/95559] GCC accepts "too many braces around scalar initializer " in the version of 6.1 - 8.4 mpolacek at gcc dot gnu.org
@ 2020-06-10 13:33 ` haoxintu at gmail dot com
2020-06-10 13:34 ` mpolacek at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: haoxintu at gmail dot com @ 2020-06-10 13:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95559
--- Comment #5 from Haoxin Tu <haoxintu at gmail dot com> ---
(In reply to Marek Polacek from comment #4)
> That's the same case, initializing an int with {{}}. GCC 8 compiled the
> second testcase, but that was fixed in r269045.
Ok, got it. At least this was a bug, can you change the status to DUPLICATE if
you are convenience? Thank you so much~
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/95559] GCC accepts "too many braces around scalar initializer " in the version of 6.1 - 8.4
2020-06-06 4:11 [Bug c++/95559] New: Compiling "{{}}" result is inconsistent in different versions haoxintu at gmail dot com
` (4 preceding siblings ...)
2020-06-10 13:33 ` haoxintu at gmail dot com
@ 2020-06-10 13:34 ` mpolacek at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2020-06-10 13:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95559
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|INVALID |DUPLICATE
--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
*** This bug has been marked as a duplicate of bug 88572 ***
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2020-06-10 13:34 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2020-06-06 4:11 [Bug c++/95559] New: Compiling "{{}}" result is inconsistent in different versions haoxintu at gmail dot com
2020-06-09 22:41 ` [Bug c++/95559] GCC fails to compile "{{}}" in some versions mpolacek at gcc dot gnu.org
2020-06-09 23:36 ` haoxintu at gmail dot com
2020-06-09 23:39 ` haoxintu at gmail dot com
2020-06-10 13:26 ` [Bug c++/95559] GCC accepts "too many braces around scalar initializer " in the version of 6.1 - 8.4 mpolacek at gcc dot gnu.org
2020-06-10 13:33 ` haoxintu at gmail dot com
2020-06-10 13:34 ` mpolacek at gcc dot gnu.org
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