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编译协议缓冲区生成的源文件时，是否有更好的方法来解决警告?

本文介绍了编译协议缓冲区生成的源文件时，是否有更好的方法来解决警告?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

对于一个简单的 proto 文件:

消息人{所需的 int32 id = 1；所需的字符串名称 = 2;可选字符串 email = 3;}

它是由protoc.exe编译的，结果用于一个同样简单的测试项目，基本上除了包含protoc生成的文件什么都不做.

我正在使用 msvc10 来构建测试项目 (x64)，然后它给了我很多警告:

警告 1 警告 C4244:'return':从 '__int64' 到 'int' 的转换，可能丢失数据 D:Workprotobuf-trunksrcgoogleprotobufdescriptor.h 1441 1 testProtobuf...警告 11 警告 C4267:参数":从size_t"到int"的转换，可能丢失数据 D:Workprotobuf-trunksrcgoogleprotobufunknown_field_set.h 142 1 testProtobuf警告 12 警告 C4267:'return':从 'size_t' 到 'int' 的转换，可能丢失数据 D:Workprotobuf-trunksrcgoogleprotobufunknown_field_set.h 237 1 testProtobuf...警告 14 警告 C4244:=":从__int64"到int"的转换，可能丢失数据 D:Workprotobuf-trunksrcgoogleprotobufiocoded_stream.h 902 1 testProtobuf警告 15 警告 C4244:'return':从 '__int64' 到 'int' 的转换，可能丢失数据 D:Workprotobuf-trunksrcgoogleprotobufiocoded_stream.h 1078 1 testProtobuf警告 16 警告 C4267:参数":从size_t"转换为google::protobuf::uint32"，可能丢失数据 D:Workprotobuf-trunksrcgoogleprotobufwire_format_lite_inl.h 663 1 testProtobuf...警告 19 警告 C4267:'return':从 'size_t' 到 'int' 的转换，可能丢失数据 D:Workprotobuf-trunksrcgoogleprotobufwire_format_lite_inl.h 739 1 testProtobuf警告 20 警告 C4267:参数":从size_t"转换为google::protobuf::uint32"，可能丢失数据 D:Workprotobuf-trunksrcgoogleprotobufwire_format_lite_inl.h 742 1 testProtobuf警告 21 警告 C4267:'return':从 'size_t' 到 'int' 的转换，可能丢失数据 D:Workprotobuf-trunksrcgoogleprotobufwire_format_lite_inl.h 743 1 testProtobuf警告 22 警告 C4267:参数":从size_t"到int"的转换，可能丢失数据 D:WorkestProtobufestProtobufperson.pb.cc 211 1 testProtobuf...警告 28 警告 C4996:std::_Copy_impl":带有可能不安全的参数的函数调用 - 此调用依赖于调用者来检查传递的值是否正确.要禁用此警告，请使用 -D_SCL_SECURE_NO_WARNINGS.请参阅有关如何使用 Visual C++ 'Checked Iterators' C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexutility 2239 1 testProtobuf 的文档警告 29 警告 C4996:std::_Copy_impl":带有可能不安全的参数的函数调用 - 此调用依赖于调用者来检查传递的值是否正确.要禁用此警告，请使用 -D_SCL_SECURE_NO_WARNINGS.请参阅有关如何使用 Visual C++ 'Checked Iterators' C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexutility 2239 1 testProtobuf 的文档

有什么好的方法可以解决所有这些警告?任何建议将不胜感激.

ps.libprotobuf 项目本身可以被 msvc10 干净编译，没有任何警告.

[编辑 2013/02/20]

工作解决方案:

  1. 为那些 protoc 生成的 .cc 文件设置属性:
    配置属性 -> c/c++ -> 高级 -> 禁用特定警告
解决方案

您可以破解 protoc 编译器的源代码，让它自动将编译指示注入生成的文件中.

在 src/google/protobuf/compiler/cpp/cpp_file.cc 在第 94 行附近的 GenerateHeader(io::Printer* printer) 中，更改第一个 printer->Print 调用到:

//生成头部的顶部.打印机->打印("//由协议缓冲区编译器生成.请勿编辑！
""//来源:$文件名$
""
""#ifndef PROTOBUF_$filename_identifier$__INCLUDED
""#define PROTOBUF_$filename_identifier$__INCLUDED
""
""#ifdef _MSC_VER
""# pragma 警告(推送)
""# pragma warning(disable: 4127 4244 4267)
""#endif
""
""#include
""
","文件名", 文件_-> 名称(),"filename_identifier", filename_identifier);

然后在 末尾在第 294 行 附近使用相同的函数，将最后一个 printer->Print 调用更改为:

 打印机->打印("#ifdef _MSC_VER
""# pragma 警告(pop)
""#endif
""
""#endif//PROTOBUF_$filename_identifier$__INCLUDED
","filename_identifier", filename_identifier);

现在您只需要编译 protoc 目标并运行新的 protoc.exe 即可在生成的标头中包含编译指示.

For a simple proto file:

message Person {
  required int32 id = 1;
  required string name = 2;
  optional string email = 3;
}

It's been compiled by protoc.exe and the results are used in an also simple test project, which basically does nothing but including the protoc generated files.

I'm using the msvc10 to build the test project (x64), then it gave me a lot of warning:

Warning 1   warning C4244: 'return' : conversion from '__int64' to 'int', possible loss of data D:Workprotobuf-trunksrcgoogleprotobufdescriptor.h 1441    1   testProtobuf
...
Warning 11  warning C4267: 'argument' : conversion from 'size_t' to 'int', possible loss of data    D:Workprotobuf-trunksrcgoogleprotobufunknown_field_set.h  142 1   testProtobuf
Warning 12  warning C4267: 'return' : conversion from 'size_t' to 'int', possible loss of data  D:Workprotobuf-trunksrcgoogleprotobufunknown_field_set.h  237 1   testProtobuf
...
Warning 14  warning C4244: '=' : conversion from '__int64' to 'int', possible loss of data  D:Workprotobuf-trunksrcgoogleprotobufiocoded_stream.h    902 1   testProtobuf
Warning 15  warning C4244: 'return' : conversion from '__int64' to 'int', possible loss of data D:Workprotobuf-trunksrcgoogleprotobufiocoded_stream.h    1078    1   testProtobuf
Warning 16  warning C4267: 'argument' : conversion from 'size_t' to 'google::protobuf::uint32', possible loss of data   D:Workprotobuf-trunksrcgoogleprotobufwire_format_lite_inl.h   663 1   testProtobuf
...
Warning 19  warning C4267: 'return' : conversion from 'size_t' to 'int', possible loss of data  D:Workprotobuf-trunksrcgoogleprotobufwire_format_lite_inl.h   739 1   testProtobuf
Warning 20  warning C4267: 'argument' : conversion from 'size_t' to 'google::protobuf::uint32', possible loss of data   D:Workprotobuf-trunksrcgoogleprotobufwire_format_lite_inl.h   742 1   testProtobuf
Warning 21  warning C4267: 'return' : conversion from 'size_t' to 'int', possible loss of data  D:Workprotobuf-trunksrcgoogleprotobufwire_format_lite_inl.h   743 1   testProtobuf
Warning 22  warning C4267: 'argument' : conversion from 'size_t' to 'int', possible loss of data    D:Work	estProtobuf	estProtobufperson.pb.cc  211 1   testProtobuf
...
Warning 28  warning C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexutility 2239    1   testProtobuf
Warning 29  warning C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:Program Files (x86)Microsoft Visual Studio 10.0VCincludexutility 2239    1   testProtobuf

Is there any good way to address all of these warning? Any suggestions will be greatly appreciated.

ps. the libprotobuf project itself can be clean compiled by msvc10 without any warning.

[edit 2013/02/20]

working solution:

  1. set properties for those protoc generated .cc files:
    configuration properties -> c/c++ -> advanced -> disable specific warnings
解决方案

You can hack the source of the protoc compiler to have it inject the pragmas into the generated files automatically.

In src/google/protobuf/compiler/cpp/cpp_file.cc in GenerateHeader(io::Printer* printer) around line 94, change the first printer->Print call to:

  // Generate top of header.
  printer->Print(
    "// Generated by the protocol buffer compiler.  DO NOT EDIT!
"
    "// source: $filename$
"
    "
"
    "#ifndef PROTOBUF_$filename_identifier$__INCLUDED
"
    "#define PROTOBUF_$filename_identifier$__INCLUDED
"
    "
"
    "#ifdef _MSC_VER
"
    "#  pragma warning(push)
"
    "#  pragma warning(disable: 4127 4244 4267)
"
    "#endif
"
    "
"
    "#include <string>
"
    "
",
    "filename", file_->name(),
    "filename_identifier", filename_identifier);

Then at the end of the same function at around line 294, change the last printer->Print call to:

  printer->Print(
    "#ifdef _MSC_VER
"
    "#  pragma warning(pop)
"
    "#endif
"
    "
"
    "#endif  // PROTOBUF_$filename_identifier$__INCLUDED
",
    "filename_identifier", filename_identifier);

Now you just need to compile the protoc target and run the new protoc.exe to have the pragmas in the generated headers.

这篇关于编译协议缓冲区生成的源文件时，是否有更好的方法来解决警告?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

08-06 04:37
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