Solaris, integer.cpp and "Types cannot be declared in anonymous union"

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Testing under Solaris 11.3 is revealing:

[  3%] Building CXX object CMakeFiles/cryptopp-object.dir/integer.cpp.o
/opt/solarisstudio12.3/bin/CC -fPIC -native -m64 -template=no%extdef -o CMakeFiles/cryptopp-object.dir/integer.cpp.o
-c /export/home/jwalton/cryptopp/integer.cpp
CC: Warning: -xchip=native detection failed, falling back to -xchip=generic
"/export/home/jwalton/cryptopp/integer.cpp", line 335: Warning: Types cannot be declared in anonymous union.
1 Warning(s) detected.

According to the Microsoft docs at Anonymous Unions:

Simply omitting the class-name portion of the syntax does not make a union an anonymous union. For a union to qualify as an anonymous union, the declaration must not declare an object.

I think we are getting into trouble because we are declaring class objects (i.e., objects of type m_halfs). That's what the SunCC compiler is complaining about.

Also see SunCC 5.12 through 5.14 and “Types cannot be declared in anonymous union”. Its our question for this issue. A related question is Why does C++ disallow anonymous structs and unions? on Stack Overflow, but its not our question.

---

I'm guessing the cod below is very old with a MSVC pedigree. It probably dates back to the late 1990s.

union
{
#ifdef CRYPTOPP_NATIVE_DWORD_AVAILABLE
    dword m_whole;
#endif
    struct
    {
    #ifdef IS_LITTLE_ENDIAN
        word low;
        word high;
    #else
        word high;
        word low;
    #endif
    } m_halfs;
};

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Cleared at Commit f2e5149319e4ed4a.