[Development] Extra link flags in QMAKE_PRL_LIBS

[Dmitry Shachnev]

Are these flags needed for static linking? If yes, can we have
different sets of link flags for static and dynamic linking?

--
Dmitry Shachnev

On Mon, Aug 19, 2013 at 9:37 PM, Dmitry Shachnev <mitya57 at ubuntu.com> wrote:
>
> Hi,
>
> In Debian/Ubuntu, we received some bug reports ([1], [2], [3]) stating
> that compiling QtWebKit apps fails with ld errors like this one:
>
>     /usr/bin/ld: cannot find -lgstapp-0.10
>     /usr/bin/ld: cannot find -lgstinterfaces-0.10
>     ...
>
> After digging the problem, we found out that the reason is .prl files,
> especially libQt5WebKitWidgets.prl which has this line (see [4]):
>
>     QMAKE_PRL_LIBS = -lX11 -lxslt -lgio-2.0 -lgstapp-0.10 -lgstinterfaces-0.10 [...]
>
> I think it is wrong because none of QtWebKit public headers refers to
> xslt or gstreamer.
>
> Is it a bug in qmake, and if yes, can it be fixed or should we change our .prl
> files downstream?
>
> A similar issue is in libQt5Multimedia{,Widgets}.prl files, which have "-lpulse"
> flag.
>
> Also, some files have multiple occurences of the same flag, i.e.
> libQt5WebKit.prl has "-lpthread" flag 6 times.
>
> [1]: http://bugs.debian.org/711307
> [2]: https://bugs.launchpad.net/bugs/1134745
> [3]: https://bugs.launchpad.net/bugs/1165250
> [4]: http://paste.debian.net/27129/