Bugzilla Bug 143921

$ emerge -pDtuv world

These are the packages that would be merged, in reverse order:

Calculating world dependencies /
!!! All ebuilds that could satisfy "app-admin/eselect-compiler" have been
masked.
!!! One of the following masked packages is required to complete your request:
- app-admin/eselect-compiler-2.0.0_rc1-r6 (masked by: package.mask)
# Ned Ludd <solar/gentoo.org> (Aug 14 2006)
# This this breaks working systems and eradicator
# has gone MIA yet again.
# Bugs 143697, 108398, 112156, 135702, 137917,
# 138296, 139016, 139629, 143684

- app-admin/eselect-compiler-2.0.0_rc2 (masked by: package.mask)
- app-admin/eselect-compiler-2.0.0_rc2-r1 (masked by: package.mask)

For more information, see MASKED PACKAGES section in the emerge man page or
refer to the Gentoo Handbook.
(dependency required by "sys-libs/glibc-2.3.6-r4" [ebuild])



!!! Problem resolving dependencies for media-plugins/xmms-status-plugin
!!! Depgraph creation failed.

note this is due to bug #143697

Just downgrade gcc-config by doing 
emerge gcc-config   

Downgrading gcc-config didn't help.

emerge --sync, please.

*** This bug has been marked as a duplicate of 143908 ***

*** This bug has been marked as a duplicate of 143908 ***