The heapscope ptest, cpptest, fails for qemux86. This failure looks like many other failures, a slight difference in library implementation library names, and/or in this case the addition of an entry at the higher (and irrelevant for this usecase) levels of the call stack. The functionality for heapscope on qemux86 for cpp modules is not compromised by these test results - the test fixture needs to be fixed.
configure --enable-board=qemux86 --enable-rootfs=glibc-small --enable-build=debug --enable-kernel=standard --with-template=feature/analysis,feature/debug-wb --enable-test=yes make fs make start-target TOPTS="-in 10" root@qemu10:/usr/lib/heapscope/ptest# ./run-ptest