gcc-defaults in testing depends on gccgo-4.6 which is no longer built by
the gcc-4.6 source package in unstable. The new gcc-defaults in unstable
is blocked from migrating due to the standoff between the release team
and the gcc maintainers over gcc-4.7. As a result of this gcc-4.6 cannot
migrate to testing.
This is bad for two reasons
Firstly there are a significant number of bugfixes between the version
in testing and the version in unstable including a number of fixes for
internal compiler errors and the fix for 670821 (currently if gcc-4.6 is
rebuilt in wheezy it's behaviour will change in ways that cause other
packages to FTBFS).
Secondly gcc-mingw-w64 was built against gcc-4.6 4.6.3-5 and it
generates it's binary versions from the gcc source versions (plus a
suffix for it's own version). This means that rebuilding gcc-mingw-w64
in wheezy (even with a bumped source version) will result in binaries
with a lower version than those currently in the wheezy archive. It also
raises potential GPL compliance issues for wheezy CDs.
There may be other packages in a similar state to gcc-mingw-w64, I
haven't checked (i'm only aware of thise one because I noticed the issue
while working on a dervitive of debian).
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