The Raspberry Pi Zero 2 W (512 MB RAM) ran out of memory compiling
signaling.cpp — nlohmann/json peaks well above available RAM at -O3,
and ninja runs 6 parallel jobs on a quad-core — so the OOM killer
terminated the compiler with 'Killed signal terminated program
cc1plus'.
When less than 1.5 GB RAM is detected, the install script now adds
1 GB of temporary build-time swap (fallocate with a dd fallback,
removed on exit; some filesystems such as btrfs refuse swapfiles
outright, in which case it warns and continues) and compiles with a
single job. The cleanup trap also covers the SDL3 source directory.
The swap mechanics were live-tested with a small swapfile (swapon/
swapoff lifecycle); this dev machine's filesystem rejects swapfiles,
which is what exposed the need for the warning fallback. The Pi's
ext4 rootfs accepts them.
fegger
56e0d3662b