boost::date_time 构建时出错 MongoDB: winapi 不是成员

Question

在使用 SCons 和 boost 构建 MongoDB 时，我遇到了错误。这是我的命令行：

C:\mongo-cxx-driver>Scons --prefix=$HOME/mongo-client-lib --cpppath=C:\boost_1_66_0 --libpath=C:\boost_1_66_0\stage64\lib --dbg=on --64 install

这是我收到的错误消息：

src\mongo\util\time_support.cpp(904): error C2039: 'winapi': is not a member of 'boost::date_time'
C:\boost_1_66_0\boost/date_time/filetime_functions.hpp(28): note: see declaration of 'boost::date_time'
src\mongo\util\time_support.cpp(904): error C3083: 'winapi': the symbol to the left of a '::' must be a type
src\mongo\util\time_support.cpp(904): error C2039: 'file_time_to_microseconds': is not a member of 'boost::date_time'
C:\boost_1_66_0\boost/date_time/filetime_functions.hpp(28): note: see declaration of 'boost::date_time'
src\mongo\util\time_support.cpp(904): error C3861: 'file_time_to_microseconds': identifier not found
src\mongo\util\time_support.cpp(936): error C2039: 'winapi': is not a member of 'boost::date_time'
C:\boost_1_66_0\boost/date_time/filetime_functions.hpp(28): note: see declaration of 'boost::date_time'
src\mongo\util\time_support.cpp(936): error C3083: 'winapi': the symbol to the left of a '::' must be a type
src\mongo\util\time_support.cpp(936): error C2039: 'file_time_to_microseconds': is not a member of 'boost::date_time'
C:\boost_1_66_0\boost/date_time/filetime_functions.hpp(28): note: see declaration of 'boost::date_time'
src\mongo\util\time_support.cpp(936): error C3861: 'file_time_to_microseconds': identifier not found
scons: *** [build\win32\dbg_on\mongo\util\time_support.obj] Error 2
scons: building terminated because of errors.

Answer 1

TL; DR - 你不能指望选择一个库的任意版本或当前版本并用它构建 MongoDB；他们在他们的 repo 中快照了他们的依赖关系，并且没有关于使用除此之外的版本构建的承诺。

MongoDB 在 src/thirdparty directory. The version of boost snapshotted there is 1.60, which was released in 2015. You can see that in that version of boost, there is a winapi namespace defined in boost/date_time/filetime_functions.hpp.

中有其依赖项的快照

但是，您正在尝试针对 released in December 2017 的 boost 1.66 进行构建。发行说明提到对 date_time:

的更改

DateTime:

The library has been converted to use Boost.WinAPI as the abstraction layer for Windows SDK.

Fixed an integral overflow that could cause incorrect results when adding or subtracting many years from a date (see here).

那个版本的 filetime_functions 在 date_time 中没有这个命名空间，current 1.67 snapshot of filetime_functions.hpp.

也没有

查看 git blame log for src/mongo/util/time_support.cpp，似乎提到 date_time::winapi 的 mongo 代码是 3 年前添加的（在此 winapi 重构之前），此后一直没有改变。

Answer 2

如果您走投无路，并且仍在使用已停产的遗留 MongoDB 驱动程序（您不应该这样做！）并且此时无法更新所有代码（您必须，最终！），并且你需要一个快速补丁，然后你可以将以下代码（取自Boost 1.53.0）插入time_support.cpp：

namespace boost {
  namespace date_time {
    namespace winapi {
    /*!
     * The function converts file_time into number of microseconds elapsed since 1970-Jan-01
     *
     * \note Only dates after 1970-Jan-01 are supported. Dates before will be wrapped.
     *
     * \note The function is templated on the FILETIME type, so that
     *       it can be used with both native FILETIME and the ad-hoc
     *       boost::date_time::winapi::file_time type.
     */
    template< typename FileTimeT >
    inline boost::uint64_t file_time_to_microseconds(FileTimeT const& ft)
    {
        /* shift is difference between 1970-Jan-01 & 1601-Jan-01
        * in 100-nanosecond intervals */
        const uint64_t shift = 116444736000000000ULL; // (27111902 << 32) + 3577643008

        union {
            FileTimeT as_file_time;
            uint64_t as_integer; // 100-nanos since 1601-Jan-01
        } caster;
        caster.as_file_time = ft;

        caster.as_integer -= shift; // filetime is now 100-nanos since 1970-Jan-01
        return (caster.as_integer / 10); // truncate to microseconds
    }
    }
  }
}

这将定义缺失的函数。

boost::date_time 构建时出错 MongoDB: winapi 不是成员

boost::date_time error while building MongoDB: winapi is not member

c++

boost

boost-date-time

mongodb