On Mon, Dec 14, 2015 at 10:11 PM, Girish H T <htgir...@gmail.com> wrote:
> Hello experts,
>
> I am porting protobuf on wince arm platform.I have understood that
> protobuf-lite already has support for this. I want to use protobuf instead
> of protobuf-lite.
>
> While compiling i came across the compilation issues saying arm wince is
> not supported platform. Below are the errors.
>
> protobuf\interface\google\protobuf\stubs\atomicops.h(174) : error C2121:
> '#' : invalid character : possibly the result of a macro expansion
> protobuf\interface\google\protobuf\stubs\atomicops.h(174) : error C2143:
> syntax error : missing ';' before 'string'
> protobuf\interface\google\protobuf\stubs\atomicops.h(174) : error C4430:
> missing type specifier - int assumed. Note: C++ does not support default-int
> protobuf\interface\google\protobuf\stubs\once.h(84) : error C2143: syntax
> error : missing ';' before '{'
> protobuf\interface\google\protobuf\stubs\once.h(84) : error C2447: '{' :
> missing function header (old-style formal list?)
> protobuf\interface\google\protobuf\generated_message_util.h(75) : error
> C2146: syntax error : missing ';' before identifier
> 'empty_string_once_init_'
> protobuf\interface\google\protobuf\generated_message_util.h(75) : error
> C4430: missing type specifier - int assumed. Note: C++ does not support
> default-int
> protobuf\interface\google\protobuf\generated_message_util.h(75) : error
> C4430: missing type specifier - int assumed. Note: C++ does not support
> default-int
> protobuf\interface\google\protobuf\generated_message_util.h(84) : error
> C2039: 'GoogleOnceInit' : is not a member of 'google::protobuf'
> protobuf\interface\google\protobuf\generated_message_util.h(84) : error
> C3861: 'GoogleOnceInit': identifier not found
> protobuf\interface\google\protobuf\io\coded_stream.h(121) : warning C4068:
> unknown pragma
> protobuf\interface\google\protobuf\io\coded_stream.h(1219) : warning
> C4068: unknown pragma
>
> d:\perforce\mil_wince_dev\build\output\windows-wince-arm-msvc9\engines\mapmatching\mapdataprovider\common\protogeneration\protobufs\
> arc.pb.cc(190) : error C2039: 'ProtobufOnceType' : is not a member of
> 'google::protobuf'
>
> d:\perforce\mil_wince_dev\build\output\windows-wince-arm-msvc9\engines\mapmatching\mapdataprovider\common\protogeneration\protobufs\
> arc.pb.cc(190) : error C2146: syntax error : missing ';' before
> identifier 'protobuf_AssignDescriptors_once_'
>
> d:\perforce\mil_wince_dev\build\output\windows-wince-arm-msvc9\engines\mapmatching\mapdataprovider\common\protogeneration\protobufs\
> arc.pb.cc(190) : error C4430: missing type specifier - int assumed. Note:
> C++ does not support default-int
>
> d:\perforce\mil_wince_dev\build\output\windows-wince-arm-msvc9\engines\mapmatching\mapdataprovider\common\protogeneration\protobufs\
> arc.pb.cc(190) : error C4430: missing type specifier - int assumed. Note:
> C++ does not support default-int
>
> d:\perforce\mil_wince_dev\build\output\windows-wince-arm-msvc9\engines\mapmatching\mapdataprovider\common\protogeneration\protobufs\
> arc.pb.cc(190) : error C2039: 'ONCE_STATE_UNINITIALIZED' : is not a
> member of 'google::protobuf'
>
> d:\perforce\mil_wince_dev\build\output\windows-wince-arm-msvc9\engines\mapmatching\mapdataprovider\common\protogeneration\protobufs\
> arc.pb.cc(190) : error C2065: 'ONCE_STATE_UNINITIALIZED' : undeclared
> identifier
>
> d:\perforce\mil_wince_dev\build\output\windows-wince-arm-msvc9\engines\mapmatching\mapdataprovider\common\protogeneration\protobufs\
> arc.pb.cc(192) : error C2039: 'GoogleOnceInit' : is not a member of
> 'google::protobuf'
>
> d:\perforce\mil_wince_dev\build\output\windows-wince-arm-msvc9\engines\mapmatching\mapdataprovider\common\protogeneration\protobufs\
> arc.pb.cc(192) : error C3861: 'GoogleOnceInit': identifier not found
>
> and so on .................................
>
> From the compilation errors i understand that root cause is atomic
> operations for arm wince is not implemented.
>
> Can you please suggest how can i implement atomic operations for arm-wince
> ?
>
Does your compiler supports C++11 atomics? If so I guess you can wrap the
C++11 atomic header to provide the needed atomic function for arm-wince.
Otherwise you will need to find out what native atomic instructions you can
use for atomic ops.
If you are only using protobuf in a single thread, you can also define
GOOGLE_PROTOBUF_NO_THREAD_SAFETY
to disable atomic ops.
> Is there any particular reason why i cant find atomic operations for
> arm-wince (I googled to check if atomic operations for any open sources to
> see if i can reuse for arm-wince).
>
> Let me know your suggestions on this.
>
> Regards
> GHT
>
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