tags 819278 help thanks I would welcome any help to reproduce this.
Some theories about why this might fail: * Lack of memory. Thanks to a cron job looking at /proc/meminfo, I know that llvm-toolchain-3.8 needs at least 4600 M of memory to build. Last two times I tried I had only 3500 M and 8000 M of swap. If this were the case, I would expect an "Out of memory" error, but not a hang. * Using only 1 CPU. My virtual machines have only one CPU most of the time. Since I collect measurements of the time required to build packages, I tell sbuild to define parallel=1 in DEB_BUILD_OPTIONS, so that all measurements are on the same scale. In the past, I found at least one case where a package built fine with 2 CPU and FTBFS with only 1 CPU. It happened to be a bug in the Makefiles. * I build with "dpkg-buildpackage -A". It could still be that the test suite expects some program to be there which was not created in the build-indep target and hangs as a result. * Some bug in sbuild which nobody reported yet. I'm using sbuild 0.68 from jessie-backports because version 0.69 has a bug that makes the required disk space figures to be very wrong. Thanks.
