[bug #65129] -Wstrict-aliasing warnings

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?65129>

                 Summary: -Wstrict-aliasing warnings
                   Group: gperf
               Submitter: None
               Submitted: Fri 05 Jan 2024 01:23:34 PM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any


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Follow-up Comments:


-------------------------------------------------------
Date: Fri 05 Jan 2024 01:23:34 PM UTC By: Anonymous
```
./configure CC=gcc-13 CXX=g++-13; make CFLAGS="-O2 -Werror=strict-aliasing"
CXXFLAGS="-O2 -Werror=strict-aliasing" CC=gcc-13 CXX=g++-13
[...]
g++-13 -O2 -Werror=strict-aliasing -I. -I./../lib -c ./keyword-list.cc
In file included from ./keyword-list.h:78,
                 from ./keyword-list.cc:22:
./keyword-list.icc: In member function 'KeywordExt_List*&
KeywordExt_List::rest()':
./keyword-list.icc:50:11: error: dereferencing type-punned pointer will break
strict-aliasing rules [-Werror=strict-aliasing]
   50 |   return *reinterpret_cast<KeywordExt_List**>(&_cdr);
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: some warnings being treated as errors
make[1]: *** [Makefile:107: keyword-list.o] Error 1
make[1]: Leaving directory '/tmp/gperf/src'
make: *** [Makefile:34: all] Error 2
```

```
$ gcc-13 --version
gcc-13 (Gentoo Hardened 13.2.1_p20231230 p11) 13.2.1 20231230
Copyright (C) 2023 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.
```







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