stage2 build fails

[Stefan Schulze Frielinghaus]

I ran into a similar(?) problem a while ago. "make maintainer-clean"
does not necessarily remove every generated file. See for example

   https://mail.haskell.org/pipermail/ghc-devs/2019-August/018049.html

Since then I only use

  git clean -dfxq && git submodule foreach git clean -dfxq

which worked reliably for me (beware that this removes any untracked
file). Maybe this helps?

Cheers,
Stefan

On Tue, Jan 28, 2020 at 10:41:33AM +0000, Simon Peyton Jones via ghc-devs wrote:
> I did "sh validate --legacy" which uses "make maintainer-clean".
> 
> I'll try again to double check.  Is there any particular file I should remove?
> 
> Simon
> 
> |  -----Original Message-----
> |  From: Ben Gamari <ben at smart-cactus.org>
> |  Sent: 27 January 2020 18:59
> |  To: Simon Peyton Jones <simonpj at microsoft.com>; ghc-devs <ghc-
> |  devs at haskell.org>
> |  Subject: RE: stage2 build fails
> |  
> |  Simon Peyton Jones <simonpj at microsoft.com> writes:
> |  
> |  > |  Indeed it would be nice to know which compiler you are using to
> |  > |  bootstrap. I suspect Sylvain is correct that the alternative can be
> |  > |  removed but first I would like to understand why this is arising only
> |  > |  now.
> |  >
> |  > I'm using 8.6.4 as my bootstrap compiler. But this message occurs only
> |  when compiling the *stage2* compiler with the *stage1* compiler. At that
> |  moment the bootstrap compiler is irrelevant.
> |  >
> |  > It's as if the build system doesn't know that the stage1 compiler is >=
> |  8.10
> |  >
> |  Hmm, interesting. Has this tree been cleaned in the last month or two?
> |  I suspect that this may have something to do with the changes to the
> |  GHC_STAGE macro that were merged a while back (perhaps a stale header
> |  file?).
> |  
> |  Cheers,
> |  
> |  - Ben
> 
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