Building dev-qt/qtgui fails on OLDER 32bit x86, without SSE2 support. The qtgui build fails as one of the components calls /usr/lib/libQt5Core.so.5 (which gets built by dev-qt/qtcore running the command through the gdb: gdb /var/tmp/portage/dev-qt/qtgui-5.12.3-r1/work/qtbase-everywhere-src-5.12.3/bin/qvkgen An Illegal Instruction is hit, which turns out to be movq. Regardless, with enough digging I found the following from the qt project: https://lists.qt-project.org/pipermail/development/2013-November/014085.html The issue appears to be the blanket SSE2 enablement which can be found at /var/tmp/portage/dev-qt/qtcore-5.12.3/work/qtbase-everywhere-src-5.12.3/mkspecs/features/qt_module.prf lines 184 - 194 it seems that the solution might just be to pass the -no-sse2 paramater in the right spot for pre SSE2 x86 processors.
Please attach the entire build log to this bug report. Please post your `emerge --info' output in a comment.
*** This bug has been marked as a duplicate of bug 648004 ***