There are currently no open bugs.

"libc++" versions published in Ubuntu

Cosmic (6.0.1-1): universe/libs
Bionic (6.0-2): universe/libs
Xenial-updates (3.7.0-1ubuntu0.1): universe/libs
Xenial (3.7.0-1): universe/libs
Trusty (1.0~svn199600-1): universe/libs