Thanks Matthew and Julian! Unfortunately, trying out GHC before/after this
change didn't turn out to be as easy as I hoped: to do my testing, I
need to build a given GHC commit, and then use that via Stack to install
~140 dependencies so that I can then test the problem I have initially
seen. And it turns out doing that with a random GHC commit is quite
painful because in any given Stackage snapshot there will be packages with
which the GHC-bundled libraries are incompatible... :/
On Thu, 4 Mar 2021, Julian Leviston wrote:
Hi,I don’t know enough about what Clash does to comment really, but it sounds
like
it’s to do with my work on enabling multiple linker instances
in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/388 — maybe reading
through
that or the plan I outlined at https://gitlab.haskell.org/ghc/ghc/-/issues/3372
might
help, though I’m not sure.
Strange, though, as this work was to isolate state in GHC — to change it from
using a
global IORef to use a per-process MVar . But it definitely did change the way
state is
handled, so it might be the related to these issues somehow?
I realise this isn’t much help, but maybe it points you in a direction where
you can
begin to understand some more.
Julian
On 4 Mar 2021, at 10:55 pm, ÉRDI Gergő <ge...@erdi.hu> wrote:
Hi,
I'm trying to figure out a Clash problem and managed to track it down to a GHC
upgrade; specifically, a given Clash version, when based on GHC 8.8, has no
problem synthesizing one module after another from one process; but the same
Clash version with GHC 8.10 fails with link-time errors on the second
compilation.
The details are at https://github.com/clash-lang/clash-compiler/issues/1686
but for now I'm just hoping that some lightbulb will go off for someone if some
handling of internal state has changed in GHC that could mean that the symbol
tables of loaded modules could persist between GHC invocations from the same
process.
So, does this ring a bell for anyone?
Thanks,
Gergo
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