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61a6d1aae2
Using the full store hash as the random seed occasionally caused reference cycles when the invocation was stored in output artifacts. For example, cross-compiled gcc was failing due to this: https://hydra.nixos.org/eval/1631713#tabs-now-fail Simply truncating the hash is sufficient to avoid this.
10 lines
392 B
Bash
10 lines
392 B
Bash
# Use the last part of the out path as hash input for the build.
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# This should ensure that it is deterministic across rebuilds of the same
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# derivation and not easily collide with other builds.
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# We also truncate the hash so that it cannot cause reference cycles.
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export NIX_CFLAGS_COMPILE+=" -frandom-seed=$(
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outbase="${out##*/}"
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randomseed="${outbase:0:10}"
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echo $randomseed
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)"
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