Re: Bringing hs-plugins up to date

After viewing the source-code, I find that the methods from GHC module eventually evaluates defaultDynFlags (in initGhcMonad). It seems that obtain a Setting is the only working way. On Wed, Mar 21, 2012 at 10:47 PM, Bin Jin wrote:

how about getSessionDynFlags from GHC module, though it runs in Ghc Monad.

anyone knows the changes to GHC API?

--Bin

On Tue, Mar 20, 2012 at 3:57 AM, Ben Gamari wrote:

...

On Mon, 19 Mar 2012 14:28:57 -0500, Jeremy Shaw wrote:

...

Does this actually work for you? It builds for me, but when readBinIface' is called, it fails because the 'undefined' is apparently actually evaluated in GHC 7.4.1.

Hmm, frankly this fix was to get another package dependent on plugins to compile (https://github.com/colah/ImplicitCAD). The program runs without evaluating undefined, but I suspect this is just because I haven't hit the relevant codepath.

After a fairly brief look at the relevant documentation, I must say I don't see any easy solution to this. The undefined in question is a DynFlags. It seems that DynFlags.defaultDynFlags can give us a DynFlags, but unfortunately, it needs a Settings value (at least in 7.4), which has no obvious. It seems the correct way to do this is with parseDynamicFlags but, alas, this too requires a DynFlags.

Cheers,

- Ben

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