slow load and typecheck

Sam Halliday sam.halliday at
Tue Oct 8 14:57:14 UTC 2019

Brandon Allbery <allbery.b at> writes:

> It's doing what you — but not ghc — consider "extra work", though. ghc
> expects to be compiling code, and doesn't have a separate code path for
> "load symbols from an external module by parsing its source code" instead
> of "load symbols from an external module by loading its .hsc file and
> object code", aside from HscInterpreted.

I'm confused: it sounds like you saying that only HscInterpreted can
load symbols of dependencies from object code. Then how does cabal+ghc
do this when I make a change to one file in my project and do a
recompile of the package?

BTW, I am seeing modules going through CodeGen that are not part of the
file's dependency graph... LoadUpTo is behaving more like LoadAll.

Best regards,
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