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* [Bug c++/96184] New: GCC treats "use of local variable with automatic storage from containing function" differently in versions
@ 2020-07-13 12:41 haoxintu at gmail dot com
  2020-07-29  3:27 ` [Bug c++/96184] " haoxintu at gmail dot com
                   ` (8 more replies)
  0 siblings, 9 replies; 10+ messages in thread
From: haoxintu at gmail dot com @ 2020-07-13 12:41 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96184

            Bug ID: 96184
           Summary: GCC treats "use of local variable with automatic
                    storage from containing function" differently in
                    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: ---

Hi, all.

This code, GCC-trunk and other versions (etc., GCC-10) treat it differently.

$cat test.cc
int main(){
    int a  = 10;
    int const b = 10;
    auto p = [ ] () noexcept ( b ? 0 : a = b) { return 0;};
    return 0;
}

$g++-trunk -std=c++14 test.cc
//nothing

$g++-10 -std=c++14 test.cc
test.cc: In function ‘int main()’:
test.cc:4:40: error: use of local variable with automatic storage from
containing function
    4 |     auto p = [ ] () noexcept ( b ? 0 : a = b) { return 0;};
      |                                        ^
test.cc:2:9: note: ‘int a’ declared here
    2 |     int a  = 10;
      |         ^

I am wondering is this a enhancement of GCC-trunk? 

I also test this in other GCC versions. Weirdly, only GCC-9 or GCC-10 rejects
it while other versions from 6.1 to 8.3 (also trunk) accepts it.

I don't know how GCC deals with this case and this also makes me confused.

Thanks,
Haoxin

^ permalink raw reply	[flat|nested] 10+ messages in thread
end of thread, other threads:[~2023-05-29 10:03 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-13 12:41 [Bug c++/96184] New: GCC treats "use of local variable with automatic storage from containing function" differently in versions haoxintu at gmail dot com
2020-07-29  3:27 ` [Bug c++/96184] " haoxintu at gmail dot com
2020-11-04 15:49 ` redi at gcc dot gnu.org
2021-09-10  6:56 ` [Bug c++/96184] [9/10 Regression] " pinskia at gcc dot gnu.org
2021-09-10 20:05 ` [Bug c++/96184] [11/12 " jason at gcc dot gnu.org
2021-09-13  2:48 ` jason at gcc dot gnu.org
2021-09-13  2:50 ` jason at gcc dot gnu.org
2022-01-08 10:46 ` pinskia at gcc dot gnu.org
2022-04-21  7:48 ` rguenth at gcc dot gnu.org
2023-05-29 10:03 ` [Bug c++/96184] [11/12/13/14 " jakub at gcc dot gnu.org

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