[Bug c++/94951] [8/9 Regression] dereferencing type-punned pointer will break strict-aliasing rules when using super class for a template type

2021-10-24 Thread pinskia at gcc dot gnu.org via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94951

Andrew Pinski  changed:

   What|Removed |Added

 CC||a-yee at u dot northwestern.edu

--- Comment #12 from Andrew Pinski  ---
*** Bug 91343 has been marked as a duplicate of this bug. ***

[Bug c++/94951] [8/9 Regression] dereferencing type-punned pointer will break strict-aliasing rules when using super class for a template type

2021-07-23 Thread pinskia at gcc dot gnu.org via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94951

Andrew Pinski  changed:

   What|Removed |Added

 CC||rrrlasse at hotmail dot com

--- Comment #11 from Andrew Pinski  ---
*** Bug 81152 has been marked as a duplicate of this bug. ***

[Bug c++/94951] [8/9 Regression] dereferencing type-punned pointer will break strict-aliasing rules when using super class for a template type

2020-09-17 Thread jakub at gcc dot gnu.org 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94951

Jakub Jelinek  changed:

   What|Removed |Added

 Resolution|--- |FIXED
 Status|ASSIGNED|RESOLVED

--- Comment #10 from Jakub Jelinek  ---
Fixed for 8.5 in r8-10503-g79a11b9833baa91cef7c881532e01470fa25047f and by the
above commit for 9.4+ too.

[Bug c++/94951] [8/9 Regression] dereferencing type-punned pointer will break strict-aliasing rules when using super class for a template type

2020-09-16 Thread cvs-commit at gcc dot gnu.org 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94951

--- Comment #9 from CVS Commits  ---
The releases/gcc-9 branch has been updated by Jakub Jelinek
:

https://gcc.gnu.org/g:eca1dbea010ba4c18ccec90bacbad5d8ec72c09f

commit r9-8897-geca1dbea010ba4c18ccec90bacbad5d8ec72c09f
Author: Jakub Jelinek 
Date:   Wed May 6 23:38:13 2020 +0200

c++: Avoid strict_aliasing_warning on dependent types or expressions
[PR94951]

The following testcase gets a bogus warning during build_base_path,
when cp_build_indirect_ref* calls strict_aliasing_warning with a dependent
expression.  IMHO calling get_alias_set etc. on dependent types feels wrong
to me, we should just defer the warnings in those cases until instantiation
and only handle the cases where neither type nor expr are dependent.

2020-05-06  Jakub Jelinek  

PR c++/94951
* typeck.c (cp_strict_aliasing_warning): New function.
(cp_build_indirect_ref_1, build_reinterpret_cast_1): Use
it instead of strict_aliasing_warning.

* g++.dg/warn/Wstrict-aliasing-bogus-tmpl.C: New test.

(cherry picked from commit d82414ebcf7716ea24688510594a2c464a105908)

[Bug c++/94951] [8/9 Regression] dereferencing type-punned pointer will break strict-aliasing rules when using super class for a template type

2020-05-07 Thread jakub at gcc dot gnu.org 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94951

Jakub Jelinek  changed:

   What|Removed |Added

Summary|[8/9/10/11 Regression]  |[8/9 Regression]
   |dereferencing type-punned   |dereferencing type-punned
   |pointer will break  |pointer will break
   |strict-aliasing rules when  |strict-aliasing rules when
   |using super class for a |using super class for a
   |template type   |template type

--- Comment #8 from Jakub Jelinek  ---
Fixed for 10.2+ and 11+ so far.