[Interest] update on building Qt/Linux with clang?

[Jean-Michaël Celerier]

Here's my stacktrace (finally had some time to do a rebuild)

#0  QString::QString (this=0x23dda0, other=...) at
../../../include/QtCore/../../../../qt5/qtbase/src/corelib/tools/qstring.h:958
#1  QLinkedListNode<QString>::QLinkedListNode (this=0x23dd90, arg=...) at
../../../include/QtCore/../../../../qt5/qtbase/src/corelib/tools/qlinkedlist.h:71
#2  QLinkedList<QString>::detach_helper2 (this=0x7fffffffdad8, orgite=...)
at
../../../include/QtCore/../../../../qt5/qtbase/src/corelib/tools/qlinkedlist.h:303
#3  0x00000000002153ad in QLinkedList<QString>::detach (this=0x23dd90) at
../../../include/QtCore/../../../../qt5/qtbase/src/corelib/tools/qlinkedlist.h:106
#4  QLinkedList<QString>::end (this=0x23dd90) at
../../../include/QtCore/../../../../qt5/qtbase/src/corelib/tools/qlinkedlist.h:209
#5  Grammar::Grammar (this=<optimized out>) at
/opt/build-sdk/qt5/qtbase/src/tools/qlalr/lalr.cpp:188
#6  main (argc=4, argv=<optimized out>) at
/opt/build-sdk/qt5/qtbase/src/tools/qlalr/main.cpp:103

I've only glanced quickly (read, less than 15 seconds) at the code but I
don't understand how it can work in any reasonable fashion: it seems that
it tries to construct a string (`QString Grammar::start` ) with the `end()`
of a container in lalr.cpp:188. But since it works in so many other
configurations I must be missing something somewhere.

Best,

-------
Jean-Michaël Celerier
http://www.jcelerier.name


On Fri, Nov 9, 2018 at 10:01 AM René J. V. Bertin <rjvbertin at gmail.com>
wrote:

> Sérgio Martins wrote:
>
> > FWIW, I just tried -flto with clang-7.0 and gold-1.16 and can't
> > reproduce QTBUG-43556 anymore.
>
> Good to know, I use the "regular" ld v2.3.0 (~gold for other reasons I
> cannot
> really remember).
>
> In the FWIW register: does clang 7 continue the trend of being noticeably
> slower
> that its predecessor (about 15% for clang 6)?
>
> R.
>
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest
>
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