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* [Bug c++/96485] New: Lambda parsing regression in GCCs 9 and onwards
@ 2020-08-05 14:07 s_gccbugzilla at nedprod dot com
2020-08-05 17:48 ` [Bug c++/96485] " jakub at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: s_gccbugzilla at nedprod dot com @ 2020-08-05 14:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96485
Bug ID: 96485
Summary: Lambda parsing regression in GCCs 9 and onwards
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: s_gccbugzilla at nedprod dot com
Target Milestone: ---
As the repro at https://godbolt.org/z/Gvx75e shows, the following code compiled
fine in GCCs up to and including GCC 8.3:
```
void test()
{
[]()
#if 1
__attribute__((no_sanitize_undefined))
#endif
->int {
return 0;
};
}
```
>From GCC 9 onwards, we get:
```
<source>: In lambda function:
<source>:7:5: error: expected '{' before '->' token
7 | ->int {
| ^~
<source>: In function 'void test()':
<source>:7:5: error: base operand of '->' has non-pointer type
'test()::<lambda()>'
<source>:7:7: error: expected unqualified-id before 'int'
7 | ->int {
| ^~~
Compiler returned: 1
```
This code compiles fine in clang, incidentally, though it doesn't recognise the
attribute.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/96485] Lambda parsing regression in GCCs 9 and onwards
2020-08-05 14:07 [Bug c++/96485] New: Lambda parsing regression in GCCs 9 and onwards s_gccbugzilla at nedprod dot com
@ 2020-08-05 17:48 ` jakub at gcc dot gnu.org
2020-08-05 17:50 ` jakub at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2020-08-05 17:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96485
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This has changed in r265787.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/96485] Lambda parsing regression in GCCs 9 and onwards
2020-08-05 14:07 [Bug c++/96485] New: Lambda parsing regression in GCCs 9 and onwards s_gccbugzilla at nedprod dot com
2020-08-05 17:48 ` [Bug c++/96485] " jakub at gcc dot gnu.org
@ 2020-08-05 17:50 ` jakub at gcc dot gnu.org
2020-08-05 18:13 ` s_gccbugzilla at nedprod dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2020-08-05 17:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96485
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
[[gnu::no_sanitize_undefined]] instead of the GNU __attribute__ is accepted,
but as the C++ specification requires it applies to the type not the
declaration and therefore it is ignored.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/96485] Lambda parsing regression in GCCs 9 and onwards
2020-08-05 14:07 [Bug c++/96485] New: Lambda parsing regression in GCCs 9 and onwards s_gccbugzilla at nedprod dot com
2020-08-05 17:48 ` [Bug c++/96485] " jakub at gcc dot gnu.org
2020-08-05 17:50 ` jakub at gcc dot gnu.org
@ 2020-08-05 18:13 ` s_gccbugzilla at nedprod dot com
2020-08-06 7:32 ` [Bug c++/96485] [9/10/11 Regression] " rguenth at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: s_gccbugzilla at nedprod dot com @ 2020-08-05 18:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96485
--- Comment #3 from Niall Douglas <s_gccbugzilla at nedprod dot com> ---
(In reply to Jakub Jelinek from comment #2)
> [[gnu::no_sanitize_undefined]] instead of the GNU __attribute__ is accepted,
> but as the C++ specification requires it applies to the type not the
> declaration and therefore it is ignored.
Obviously the above is an extract from production code. We were using lambdas
to wrap individual bits of unsafe code which trips the UB sanitiser. It would
be useful to retain that ability, as having to sprinkle the code with:
struct { auto operator()(auto...) const __attribute__((no_sanitize_undefined))
{ } }()(...);
... seems retrograde.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/96485] [9/10/11 Regression] Lambda parsing regression in GCCs 9 and onwards
2020-08-05 14:07 [Bug c++/96485] New: Lambda parsing regression in GCCs 9 and onwards s_gccbugzilla at nedprod dot com
` (2 preceding siblings ...)
2020-08-05 18:13 ` s_gccbugzilla at nedprod dot com
@ 2020-08-06 7:32 ` rguenth at gcc dot gnu.org
2021-01-14 9:18 ` rguenth at gcc dot gnu.org
2021-02-26 4:13 ` jason at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-08-06 7:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96485
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |9.3.1
Keywords| |rejects-valid
Known to work| |8.3.0
Known to fail| |9.1.0
Target Milestone|--- |9.4
Summary|Lambda parsing regression |[9/10/11 Regression] Lambda
|in GCCs 9 and onwards |parsing regression in GCCs
| |9 and onwards
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/96485] [9/10/11 Regression] Lambda parsing regression in GCCs 9 and onwards
2020-08-05 14:07 [Bug c++/96485] New: Lambda parsing regression in GCCs 9 and onwards s_gccbugzilla at nedprod dot com
` (3 preceding siblings ...)
2020-08-06 7:32 ` [Bug c++/96485] [9/10/11 Regression] " rguenth at gcc dot gnu.org
@ 2021-01-14 9:18 ` rguenth at gcc dot gnu.org
2021-02-26 4:13 ` jason at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-01-14 9:18 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96485
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/96485] [9/10/11 Regression] Lambda parsing regression in GCCs 9 and onwards
2020-08-05 14:07 [Bug c++/96485] New: Lambda parsing regression in GCCs 9 and onwards s_gccbugzilla at nedprod dot com
` (4 preceding siblings ...)
2021-01-14 9:18 ` rguenth at gcc dot gnu.org
@ 2021-02-26 4:13 ` jason at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2021-02-26 4:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96485
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Duplicate.
*** This bug has been marked as a duplicate of bug 90333 ***
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2021-02-26 4:13 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2020-08-05 14:07 [Bug c++/96485] New: Lambda parsing regression in GCCs 9 and onwards s_gccbugzilla at nedprod dot com
2020-08-05 17:48 ` [Bug c++/96485] " jakub at gcc dot gnu.org
2020-08-05 17:50 ` jakub at gcc dot gnu.org
2020-08-05 18:13 ` s_gccbugzilla at nedprod dot com
2020-08-06 7:32 ` [Bug c++/96485] [9/10/11 Regression] " rguenth at gcc dot gnu.org
2021-01-14 9:18 ` rguenth at gcc dot gnu.org
2021-02-26 4:13 ` jason at gcc dot gnu.org
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