Set CCACHE_BASEDIR when using ccache - #10378
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Set CCACHE_BASEDIR to the source root so ccache rewrites absolute paths to be relative. This lets different checkouts/worktrees of the same commit share cache entries.
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I remember this option was problematic, and their own docs call it a "brittle hack". Let's not do this unconditionally in project-wide cmake. Isn't it trivial to set locally?
reference: https://ccache.dev/manual/latest.html#config_base_dir
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Set CCACHE_BASEDIR to the source root so ccache rewrites absolute paths
to be relative. This lets different checkouts/worktrees of the same commit
share cache entries.