Wireshark-dev: [Wireshark-dev] /Qspectre

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From: "Maynard, Chris" <Christopher.Maynard@xxxxxxx>
Date: Mon, 9 Apr 2018 18:58:27 +0000

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 '/Qspectre'”.

 

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

[1]: https://www.wireshark.org/docs/wsdg_html_chunked/ChSetupWin32.html

[2]: https://blogs.msdn.microsoft.com/vcblog/2018/01/15/spectre-mitigations-in-msvc/

 

 

 

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