For Win32/64 developers, the Wireshark Developer's Guide currently mentions 
"Microsoft Visual Studio 2015 Community Edition" as the compiler to download 
and install[1].  That is the version I'm currently running.  Here are the 
relevant details:

    Microsoft Visual Studio Community 2015
    Version 14.0.25431.01 Update 3
    Microsoft .NET Framework
    Version 4.7.02046

    Installed Version: Community

    Visual C++ 2015   00322-20000-00000-AA898
    Microsoft Visual C++ 2015

When compiling Wireshark with this version of MSVC, it seems that /Qspectre is 
not yet supported and so at last count, 312 warnings were generated, most 
(all?) of the form, "cl : Command line warning D9002: ignoring unknown option 

Microsoft's "Spectre mitigations in MSVC" page[2] indicates the following:
We initially plan to include support for /Qspectre in the following:
*         Visual Studio 2017 version 15.6 Preview 4
*         An upcoming servicing update to Visual Studio 2017 version 15.5
*         A servicing update to Visual Studio 2017 "RTW"
*         A servicing update to Visual Studio 2015 Update 3
I don't know whether the Community Edition of Visual Studio 2015 is included in 
the planned servicing update or not, but I would expect it to be.  In any case, 
it seems that it's not yet available, even if it is planned.

Maybe there's a way to detect whether /Qspectre is supported by the compiler or 
not and omit it if it isn't in order to avoid all of these warnings?
- Chris

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