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Second Eoan Ermine test rebuilds

The second test rebuild of Eoan Ermine was started on September 06 2019 for
all architectures, all components. The rebuild of the main component is
finished, the other components (restricted, universe, multiverse) are still
building.

Unfortunately we see 1300+ build failures, and still counting ... On the other
hand the test rebuild includes the recent GCC, glibc packages, and the
glib2.o/gtk packages synced from experimental.

Results (please also look at the superseded builds) can be found at

<a href="https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20190906-eoan.html" title="https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20190906-eoan.html">https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20190906-eo...</a>

The report uses some additional color coding, marking packages different which
always failed to build, or where the build failure is no regression compared to
bionic. The test rebuild already uses the linux-libc-dev 5.3 package found in
the ubuntu-toolchain-r/volatile PPA.

Additional build failures for packages in eoan-proposed (not yet in eoan)
can be found at <a href="http://qa.ubuntuwire.com/ftbfs/" title="http://qa.ubuntuwire.com/ftbfs/">http://qa.ubuntuwire.com/ftbfs/</a>

Please help fixing the build failures.

There is also a test rebuild with link time optimization turned on by default
(passing -flto=auto in CFLAGS/CXXFLAGS). Other distributions turned these
optimzations on by default, or are considering doing that.

<a href="https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20190906-lto-eoan.html" title="https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20190906-lto-eoan.html">https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20190906-lt...</a>

Packages to use -flto by default (dpkg) can be found in the
ubuntu-toolchain-r/dpkg-lto PPA. WARNNING: Make sure to install these dpkg
packages in a throw-away environment.

Matthias