for some changes of .hs file (where just
the implementation changes) the .o file can be regenerated without
touching the .hi file. This allows more accurate build dependencies
and less recompilation.
Is that really the case? I thought that GHC may add code to the
interface files for cross-module inlining purposes, which means that
changing the implementation might change the interface too.
Indeed, GHC _may_ change the interface file for such reasons, but it
may equally decide to leave the interface untouched, e.g. if there are
no new inlinings.
Regards,
Malcolm
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