[Qt-creator] Clang code model running in C++98 mode
Nikolai.Kosjar at qt.io
Thu Nov 15 16:33:50 CET 2018
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?
> 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
> // __cplusplus macro - it reports "199711L", even for newer language
> // However:
> // * For >= Visual Studio 2015 Update 3 predefines _MSVC_LANG which
> has the proper value
> // of __cplusplus.
> // See
> // * For >= Visual Studio 2017 Version 15.7 __cplusplus is correct
> once /Zc:__cplusplus
> // is provided on the command line. Then __cplusplus == _MSVC_LANG.
> // See
> // 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.
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