[webkit-dev] Linking against MultiThreadedDLL instead of MultiThreaded on Windows (wincairo)

[Isaac Devine]

On 19 May 2017 at 16:16, Fujii Hironori <fujii.hironori at gmail.com> wrote:

> On Fri, May 19, 2017 at 8:18 AM, Isaac Devine <isaac at devinesystems.co.nz>
> wrote:
> > Hi,
> >
> > I'm looking at linking against WebKit in my application, which is linked
> > against the MultiThreadedDLL CRT (i.e. dynamically linked); however
> WebKit
> > is linked against the MultiThreaded CRT (i.e. statically linked). I've
> > linked against previous builds with this configuration "without
> problems".
>
> What problem do you have. It should not cause any problem by using any
> type of CRT in WebKit.dll except this problem
> <https://msdn.microsoft.com/en-us/library/ms235460.aspx>.
>

I have a linker warning because it was no longer linked to the
MultiThreadedDLL, and was statically linked instead. The behavior described
matched some issues I was having. I'm basically updating to the latest
trunk of WebKit for the application and the /nodefaultlib changes have
arrived after my previous snapshot.


> > I've found bug https://bugs.webkit.org/show_bug.cgi?id=157067 which
> describe
> > removing the /nodefaultlib for the libcmt (the MultiThreaded static
> libary),
> > but in the comments they mention an eventual transition to the
> MultiThreaded
> > CRT.
> >
> > Is that time now? :-)
>
>   Bug 170594 – [CMake][Windows] Use DLL CRT instead of static CRT
>   https://bugs.webkit.org/show_bug.cgi?id=170594
>
> Thanks I've attached my WIP patch for comparison, notably I modify some
props files as well, but from your patch I'm guessing they aren't used
anymore?

>
> > I've been making local changes to do this and have noticed in the cmake
> > files that a few of them will swap out the Debug versions of the CRT for
> the
> > release ones, is there a specific reason for that?
>
> The debug CRT makes WebKit unbearably slow.
>
> Makes sense.

>
> > Additionally, relating to the /nodefaultlib directives that are present
> in
> > several build files; my understanding is that if all of the projects were
> > compiled against the same CRT these can be removed?
>
> I think so, too.
>
> > From my reading of bug
> > 157067, I believe that the nodefaultlib directives have hidden bugs in
> the
> > past, is that correct?
>
> ---
> Fujii Hironori
> Sony Interactive Entertainment Inc.
>
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