LTO significantly increase memory requirements for buildd machines. Do we have enough RAM and swap on each build server? > Link time optimizations are also at least turned on in other distros like > Fedora, OpenSuse (two years) and Ubuntu (one year). I know Ubuntu has builders with 8 GB RAM + 4 GB swap which is not enough in all cases. https://answers.launchpad.net/launchpad/+question/694428
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