[Development] qt-4.8.6 + gcc5 fails to build ?

Thiago Macieira thiago.macieira at intel.com
Fri Feb 13 23:21:09 CET 2015

On Friday 13 February 2015 11:37:27 Rex Dieter wrote:
> Fedora development has recently adopted gcc5, and we've run into several
> problems, one of which is that qt-4.8.6 fails to build, when linking
> libQtGui:
> .obj/release-shared/qdrawhelper_sse2.o: In function `unsigned int const*
> qt_fetch_radial_gradient_template<QRadialFetchSimd<QSimdSse2> >(unsigned
> int*, Operator const*, QSpanData const*, int, int, int)':
> /builddir/build/BUILD/qt-everywhere-opensource-
> src-4.8.6/src/gui/../../include/QtGui/private/../../../src/gui/painting/qdra
> whelper_p.h:396: undefined reference to `qt_memfill32'
> collect2: error: ld returned 1 exit status
> same problem with latest 4.8.7 2015-02-02-3 snapshot.
> Currently tracking issue @
> https://bugreports.qt.io/browse/QTBUG-44466
> anyone with similar or different experiences?

It's a GCC bug. One file defines a symbol "qt_memfill32" and the other searches 
for "_Z12qt_memfill32".

GCC 4.9, Clang and ICC don't have this problem. Therefore, it's a GCC bug.
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center

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