gcc version 13.2.0 (Ubuntu 13.2.0-23ubuntu4) seems to remove some
code in release builds that is embedded in a macro in qtransfrom.cpp.
This patch changes the macro into a function such that it is not
removed by gcc.
It seems like the switch statement is (wrongly) optimized away if it is
embedded in the QTransform::map(QPolygonF) overload. nx and ny are
always 0 (as initialized by QPolygonF) after the macro (but only within
the QTransform::map(QPolygonF) function.
The bug happens only in a release build. Added debug messages of nx and
ny created no output, adding qDebug() << t, which made the macro work.
It seems that a complex combination of macro and switch statement can
tigger the bug in gcc. So rewriting the macro as a function works around
the bug.
Fixes: QTBUG-127723
Change-Id: I7e0b02cde276e591cf773f4e18dd505134421957
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
(cherry picked from commit 11b70b66de627d3bd0ef4193d5cfa624c88ac96a)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
1909435b03