[Development] MSVC not inlining QRect inline functions (anymore?)

[Philippe]

>> Could we perhaps make some of these functions export-only?
>> Just remove the dllimport side of things, only export the symbol.

I tried (removing Q_CORE_EXPORT on the class itself and adding it only
for the non-inlined functions), but it does not work (build is Ok, but
function are still not inlined). Using Qt 6.11.1.

But the most incredible thing: I have justed tested with Qt 6.9.1, without
changes. And it is the same thing: QRect / QPoint methods are not
inlined, though QCheckedInt is not used.
It's incomprehensible.

So yes, MSVC is definitely bad for inlining :(

I am using almost the last MSVC 2022 version (17.14.32)

Philippe

On Mon, 8 Jun 2026 15:28:34 +0000
Mårten Nordheim via Development <development at qt-project.org> wrote:

> 
> Testing this with the inline debugging things from MSVC it is simply listing the reason for not inlining as 'dllimport check failed'.
> So it seems to not inline solely based on it being marked dllimport.
> 
> Could we perhaps make some of these functions export-only? Just remove the dllimport side of things, only export the symbol.
> 
> Mårten
> 
> ________________________________________
> From: Development <development-bounces at qt-project.org> on behalf of Philippe <philwave at gmail.com>
> Sent: Monday, June 8, 2026 16:05
> To: development at qt-project.org
> Subject: Re: [Development] MSVC not inlining QRect inline functions (anymore?)
> 
> I have just verified that not only QRect, but QPoint, QSize and QMargins are
> also affected :(
> 
> QCheckedInt overflow checks only manifest as assertions in debug builds.
> Yet, this debug-only feature has a negative impact on the MSVC release
> version :(
> Not exactly, "Pay Only For What You Use"...
> 
> Philippe
> 
> On Sun, 7 Jun 2026 17:48:33 +0200
> Christian Ehrlicher via Development <development at qt-project.org> wrote:
> 
> > Hi,
> >
> > I recently found out that none of the QRect inline functions are inlined by msvc no matter what compiler options I pass. Tested with recent cl (19.51.36244) but also saw this with older msvc2022 compilers.
> > Is this known and should/can we do something against this?
> >
> >
> > Christian
> > -- Development mailing list
> > Development at qt-project.org
> > https://lists.qt-project.org/listinfo/development
> 
> 
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