Adam, Thanks for your reply. Here I attached a simple .proto file to demonstrate this warning message:
$ protobuf-3.1/bin/protoc --cpp_out=. demo.proto
$ /usr/bin/g++ -Iprotobuf-3.1/include -c -Wall -O2 -Wno-long-long demo.pb.
cc -o demo.pb.o
In member function 'virtual bool
demo::DemoMessage::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)'
:
cc1plus: warning: dereferencing pointer 'prephitmp.1630' does break
strict-aliasing
rules
demo.pb.h:266: note: initialized from here
cc1plus: note: initialized from here
Please let me know if anything else you need to debug further.
Thanks,
Changchun
On Friday, November 11, 2016 at 4:45:03 PM UTC-5, Adam Cozzette wrote:
>
> What version of g++ are you using? Also, do you have a way of determining
> what actual line of code the compiler is warning about there?
>
> I tried building with -Wstrict-aliasing=2 at commit df8390790a and saw a
> few warnings like this:
>
> ./google/protobuf/generated_message_util.h:94:66: warning: dereferencing
> type-punned pointer might break strict-aliasing rules [-Wstrict-aliasing]
> const T& get() const { return reinterpret_cast<const T&>(union_); }
>
> But that doesn't look like it's quite the same warning as what you are
> seeing.
>
> On Fri, Nov 11, 2016 at 12:39 PM, <changchun...@gmail.com <javascript:>>
> wrote:
>
>> I have below option in my .proto file:
>>
>> *option cc_enable_arenas = true;*
>>
>> But g++ for Linux gives below warning:
>>
>> *cc1plus: warning: dereferencing pointer 'prephitmp.4925' does break
>> strict-aliasing rules*
>>
>> Will this cause issue and how to solve it?
>>
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demo.proto
Description: Binary data
