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The Git configuration value ocaml.configure-cache can be used to specify
a directory to keep autoconf cache files in, relative to the worktree
root (so `git config ocaml.configure-cache .` enables the feature, and
`git config --global ocaml.configure-cache ..` enables it for all
worktrees, assuming they're at the same level).
autoconf's --cache-file option speeds up future runs of configure by
caching the results of previous tests. The cache is invalidated if any
environment variables differ (e.g. LDFLAGS) or if the build-host-target
triplet differs. This is a nuisance on Windows, where configure is both
very slow and it's also common to build with multiple different --host
values.
This PR allows a tree to be quickly reconfigured from one Windows port
to another.
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