[Bug c++/58678] [4.9 Regression] pykde4-4.11.2 link error (devirtualization too trigger happy)

[nheghathivhistha at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58678

--- Comment #31 from David Kredba <nheghathivhistha at gmail dot com> ---
Calligra-2.8.0 is now affected too with revision 

/var/tmp/portage/app-office/calligra-2.8.0/temp/ccAMiINB.ltrans1.ltrans.o: In
function `operator<':
/var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170:
undefined reference to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions
const&)'
/var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170:
undefined reference to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions
const&)'
/var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170:
undefined reference to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions
const&)'
/var/tmp/portage/app-office/calligra-2.8.0/temp/ccAMiINB.ltrans1.ltrans.o: In
function `qMapLessThanKey':
/var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170:
undefined reference to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions
const&)'
/var/tmp/portage/app-office/calligra-2.8.0/temp/ccAMiINB.ltrans1.ltrans.o: In
function `operator<':
/var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170:
undefined reference to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions
const&)'
/var/tmp/portage/app-office/calligra-2.8.0/temp/ccAMiINB.ltrans1.ltrans.o:/var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170:
more undefined references to
`Calligra::Sheets::qHash(Calligra::Sheets::Conditions const&)' follow
collect2: error: ld returned 1 exit status
sheets/CMakeFiles/calligrasheetscommon.dir/build.make:3104: recipe for target
'lib/libcalligrasheetscommon.so.13.0.0' failed