[Bug testsuite/81399] New test case 27_io/basic_stringstream/assign/81338.cc fails on powerpc64le

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81399

--- Comment #1 from seurer at gcc dot gnu.org ---
I was wrong, it fails at least some of the time on powerpc64 BE too.