Detect and report incorrect use of <stabilize-allarches/>

Report a QA warning when <stabilize-allarches/> is used on a package
installing ELF files.  We can easily check this through presence of
(non-empty) NEEDED build-info files.

Signed-off-by: Michał Górny <mgorny@gentoo.org>
Reviewed-by: Zac Medico <zmedico@gentoo.org>
Closes: #723

bin/misc-functions.sh

@@ -201,10 +201,15 @@ install_qa_check() {
 			echo "${QA_SONAME_NO_SYMLINK}" > \
 			"${PORTAGE_BUILDDIR}"/build-info/QA_SONAME_NO_SYMLINK
 
-		if has binchecks ${RESTRICT} && \
-			[ -s "${PORTAGE_BUILDDIR}/build-info/NEEDED.ELF.2" ] ; then
-			eqawarn "QA Notice: RESTRICT=binchecks prevented checks on these ELF files:"
-			eqawarn "$(while read -r x; do x=${x#*;} ; x=${x%%;*} ; echo "${x#${EPREFIX}}" ; done < "${PORTAGE_BUILDDIR}"/build-info/NEEDED.ELF.2)"
+		if [[ -s ${PORTAGE_BUILDDIR}/build-info/NEEDED.ELF.2 ]]; then
+			if grep -qs '<stabilize-allarches/>' "${EBUILD%/*}/metadata.xml"; then
+				eqawarn "QA Notice: stabilize-allarches/> found on package installing ELF files"
+			fi
+
+			if has binchecks ${RESTRICT}; then
+				eqawarn "QA Notice: RESTRICT=binchecks prevented checks on these ELF files:"
+				eqawarn "$(while read -r x; do x=${x#*;} ; x=${x%%;*} ; echo "${x#${EPREFIX}}" ; done < "${PORTAGE_BUILDDIR}"/build-info/NEEDED.ELF.2)"
+			fi
 		fi
 	fi