[Qt-creator] Clang code model running in C++98 mode

[Marco Bubke]

Hi


You cannot set MSVC 2017 Version 15.8 to C++11, only C++14 or C++17 is possible. If you set it to C++11 you should get C++17.

________________________________
From: Qt-creator <qt-creator-bounces+marco.bubke=qt.io at qt-project.org> on behalf of Nikolai Kosjar <Nikolai.Kosjar at qt.io>
Sent: Thursday, November 15, 2018 4:33:50 PM
To: Julius Bullinger; qt-creator at qt-project.org
Subject: Re: [Qt-creator] Clang code model running in C++98 mode

On 11/15/18 3:55 PM, Julius Bullinger wrote:
> Hi Nikolai
>
> On 06.11.2018 12:19, Nikolai Kosjar wrote:
>> Recently there were some changes in that area. Could you please try
>> again with the updated snapshots for 4.8?
>>
>> http://download.qt.io/snapshots/qtcreator/4.8/4.8.0-beta2
>
> I managed to built the latest 4.8 branch on my machine, and still got
> the same issue:
>
>>> I can't reproduce it with a smaller project, but is there any way I can
>>> debug this issue? Like get the options that are passed from qmake to the
>>> code model?
>>
>> A breakpoint in ProjectInfoGenerator::createProjectPart() should help,
>> especially on
>>
>>     part->languageVersion = macroInspectionReport.languageVersion;
>>
>
> On the first break after loading the project,
> macroInspectionReport.languageVersion is CXX14 (7). On further breaks,
> it's CXX98 (4).
>
> I cannot find any differences in the respective qmake projects. The
> flags.commandLineFlags that are passed are the following:
>
> -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline /wd4503 /w14239 /FC
> /D_LIntStatic /Zi /Fd<path> -O2 -Zi -MD -Zc:strictStrings -W3 -w34100
> -w34189 -w44996 /WX -EHsc
>
> However, I found that in tcInfo.macroInspectionRunner, the "__cplusplus"
> macro has a value of 199711L. This is from msvctoolchain.cpp, which
> shows some information about the possible values:
>
> // We want to detect the language version based on the predefined macros.
> // Unfortunately MSVC does not conform to standard when it comes to the
> predefined
> // __cplusplus macro - it reports "199711L", even for newer language
> versions.
> //
> // However:
> //   * For >= Visual Studio 2015 Update 3 predefines _MSVC_LANG which
> has the proper value
> //     of __cplusplus.
> //     See
> https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=vs-2017
>
> //   * For >= Visual Studio 2017 Version 15.7 __cplusplus is correct
> once /Zc:__cplusplus
> //     is provided on the command line. Then __cplusplus == _MSVC_LANG.
> //     See
> https://blogs.msdn.microsoft.com/vcblog/2018/04/09/msvc-now-correctly-reports-__cplusplus
>
> //
> // We rely on _MSVC_LANG if possible, otherwise on some hard coded
> language versions
> // depending on _MSC_VER.
>
> We're still running MSVC 2013, which doesn't seem to be covered by this
> exceptions. I tested opening the project with a MSVC 2017 Version 15.8
> kit, and with that, the code model reports a C++ version of CXX17
> (although it should be C++11)!
>
> So, I guess this is a bug in Creator regarding C++ version detection
> with MSVC 2013?

Looks like that, yes, please report.

For some reason the code path that checks _MSC_VER fails or is never
executed. Or there is a bug in the macro cache.

Nikolai
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