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nixpkgs/pkgs/build-support/setup-hooks/reproducible-builds.sh
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# Use the last part of the out path as hash input for the build.
# This should ensure that it is deterministic across rebuilds of the same
# derivation and not easily collide with other builds.
# We also truncate the hash so that it cannot cause reference cycles.
NIX_CFLAGS_COMPILE="${NIX_CFLAGS_COMPILE:-} -frandom-seed=$(
randSeed=${NIX_OUTPATH_USED_AS_RANDOM_SEED:-$out}
outbase="${randSeed##*/}"
randomseed="${outbase:0:10}"
echo $randomseed
)"
export NIX_CFLAGS_COMPILE