Yes, these are safe to ignore. This is also addressed in r302:
http://code.google.com/p/protobuf/source/detail?r=302

On Thu, Apr 15, 2010 at 12:40 PM, Fishtank <saptarshi.g...@gmail.com> wrote:

> Hello,
> I ran protoc --cpp_out on a proto file using 2.3.0 compiler . I
> replaced the my previously generated cpp and header files with the new
> ones and compiled.
> It works,but I get some compiler warnings, which always makes me
> concerned.
>
> Can I safely ignore these?
>
> g++ -I/ln/meraki/custom//lib64/R/include  -I/usr/local/include    -
> fpic  -g -O2 -I. -g  -DHAVE_UINTPTR_T  `pkg-config --cflags protobuf` -
> Wall -c utility.cc -o utility.o
> /ln/meraki/custom/include/google/protobuf/io/coded_stream.h: In member
> function ‘bool
>
> google::protobuf::io::CodedInputStream::ReadLittleEndian32(google::protobuf::uint32*)’:
> /ln/meraki/custom/include/google/protobuf/io/coded_stream.h:776:
> warning: comparison between signed and unsigned integer expressions
> /ln/meraki/custom/include/google/protobuf/io/coded_stream.h: In member
> function ‘bool
>
> google::protobuf::io::CodedInputStream::ReadLittleEndian64(google::protobuf::uint64*)’:
> /ln/meraki/custom/include/google/protobuf/io/coded_stream.h:791:
> warning: comparison between signed and unsigned integer expressions
>
> Thank you
> Saptarshi
>
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