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51ca56bca9
First layer cache of CircleCI is reused when second cache is invalidated: that is, to not compiled musl-cross-make from source for x86/ppc64 at each build when any other thing changed under Heads. Unfortunately, https://github.com/linuxboot/heads/pull/1947 was incomplete in that regard, as showed per build: - last save cache step https://app.circleci.com/pipelines/github/tlaurion/heads/3270/workflows/07dee00e-926e-4023-b8a7-669078e6ef31/jobs/66483 - first layer cache saving https://app.circleci.com/pipelines/github/tlaurion/heads/3270/workflows/07dee00e-926e-4023-b8a7-669078e6ef31/jobs/66483 - Warning: could not archive /root/heads/build/ppc64/musl-cross-make-38e52db8358c043ae82b346a2e6e66bc86a53bc1 - Not found - Warning: could not archive /root/heads/build/x86/musl-cross-make-38e52db8358c043ae82b346a2e6e66bc86a53bc1 - Not found It is also irrelevant to bind first layer cache with .circleci/config.yml, nor Makefile related changes. After all the first layer is related to reusing musl-cross-make to reduce build times on CI Therefore, only flake.lock and modules/musl-cross-make is relevant to be part of hashed files that should nto change to construct/reuse that cache Signed-off-by: Thierry Laurion <insurgo@riseup.net>