build: serialize builds with .NOTPARALLEL to cap RAM and keep stderr … - #16
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…clean Unbounded make -j (or concurrent multi-tier builds) peaks RAM high enough to swap-freeze low-headroom machines — measured cause of repeated hangs. Serial builds cost ~19s over -j2 (link-bound anyway) and stay well under one tier's RAM. .NOTPARALLEL is used instead of forcing -j in MAKEFLAGS because the latter emits a jobserver warning under the recursive tier builds, which audit.sh (and thus CI) treats as a failure. verify-tiers builds all three tiers sequentially for safe -Werror checks.
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…clean
Unbounded make -j (or concurrent multi-tier builds) peaks RAM high enough to swap-freeze low-headroom machines — measured cause of repeated hangs. Serial builds cost ~19s over -j2 (link-bound anyway) and stay well under one tier's RAM. .NOTPARALLEL is used instead of forcing -j in MAKEFLAGS because the latter emits a jobserver warning under the recursive tier builds, which audit.sh (and thus CI) treats as a failure. verify-tiers builds all three tiers sequentially for safe -Werror checks.