Packages with the libcxx use flag

sci-physics / root : C++ data analysis framework and interpreter from CERN

  • Build ROOT against sys-libs/libcxx

sys-devel / clang-runtime : Meta-ebuild for clang runtime libraries

  • Install sys-libs/libcxx for -stdlib=libc++

www-client / chromium : Open-source version of Google Chrome web browser

  • Use bundled libc++ instead of libstdc++ for building.