This stuff is ignored upstream (see URL) and it causes real runtime problems (i.e., random segfaults) See attachment for the "progress" made in latest version. In fact this is getting worse from version to version.
Created attachment 224399 [details] this thing is not -fstrict-aliasing safe
+ 16 Apr 2010; Samuli Suominen <ssuominen@gentoo.org> inkscape-0.47.ebuild, + +files/inkscape-0.47-gcc45.patch, metadata.xml: + Fix building with GCC 4.5 wrt #305749 by Daniel J.. Fix PostScript + dependencies wrt #309213 by Willie Wong and Christopher Harvey. Disable + strict aliasing wrt #310393 by Doktor Notor.
I have reported the remaining issue upstream (libuemf) at https://gitlab.com/inkscape/lib2geom/-/issues/71#note_1808522376.