Automating GHC build for Windows

[Gintautas Miliauskas]

Without knowing much about the surrounding code, I would try two things
here.

1. Is it possible that the file was opened by for writing and not closed
because of lazy I/O?

2. Since the error is completely deterministic, you could try "freezing"
evaluation right before the crash (either by a breakpoint in ghci or just
adding a time delay / console read on the code), and then using a utility
app
<http://serverfault.com/questions/1966/how-do-you-find-what-process-is-holding-a-file-open-in-windows>
to
check which process is keeping the file open, whether it's the same process
or something else.

If any of the involved paths is a directory, this could be #8482
<https://ghc.haskell.org/trac/ghc/ticket/8482>, although that does not seem
to be the case.

On Thu, Oct 30, 2014 at 7:13 PM, Páli Gábor János <pali.gabor at gmail.com>
wrote:

> 2014-10-30 16:24 GMT+01:00 Gintautas Miliauskas <gintautas at miliauskas.lt>:
> > I wonder what's going on with DeleteFile. What is the step that's
> failing?
>
> Basically it happens at the same point, that is, at the "configure"
> phase but at the ghc-prim package.  Note that the previously mentioned
> workaround has a "removeFile" action [1], I guess the failure of that
> triggers the DeleteFile exception.
>
> > Can you post the log?
>
> "inplace/bin/ghc-cabal.exe" configure libraries/ghc-prim dist-install
> "" --with-ghc="C:/msys64/home/ghc-builder/ghc/inplace/bin/ghc-stage1.exe"
> --with-ghc-pkg="C:/msys64/home/ghc-builder/ghc/inplace/bin/ghc-pkg.exe"
> --flag=include-ghc-prim --disable-library-for-ghci
> --enable-library-vanilla --enable-library-for-ghci
> --enable-library-profiling --disable-shared
> --configure-option=CFLAGS=" -U__i686 -march=i686 -fno-stack-protector
>  " --configure-option=LDFLAGS="   " --configure-option=CPPFLAGS="   "
> --gcc-options=" -U__i686 -march=i686 -fno-stack-protector       "
> --with-gcc="C:/msys64/home/ghc-builder/ghc/inplace/mingw/bin/gcc.exe"
> --with-ld="C:/msys64/home/ghc-builder/ghc/inplace/mingw/bin/ld.exe"
>
> --configure-option=--with-cc="C:/msys64/home/ghc-builder/ghc/inplace/mingw/bin/gcc.exe"
> --with-ar="/usr/bin/ar" --with-alex="/usr/local/bin/alex"
> --with-happy="/usr/local/bin/happy"
> Configuring ghc-prim-0.3.1.0...
> ghc-cabal.exe: DeleteFile "dist-install\\setup-config": permission
> denied (The process cannot access the file because it is being used by
> another process.)
> libraries/ghc-prim/ghc.mk:4: recipe for target
> 'libraries/ghc-prim/dist-install/package-data.mk' failed
> make[1]: *** [libraries/ghc-prim/dist-install/package-data.mk] Error 1
> Makefile:71: recipe for target 'all' failed
>
> > I also wonder why this issue is not arising on other Windows machines...
>
> As the comment in the workaround goes, it has a "Big fat hairy race
> condition".  Therefore I am inclined to believe that it may be a
> problem for other systems as well, but I am the most unfortunate one
> who hits this error with 100% probability :-)
>
> [1]
> https://github.com/ghc/ghc/blob/master/libraries/bin-package-db/GHC/PackageDb.hs#L267
>



-- 
Gintautas Miliauskas
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