[Haskell-cafe] ghc/cabal problems - mystery?

[Gregory Guthrie]

Thanks - I'll investigate this.

Note, that Cabal adding an additional 7 levels of directory (and ~70 characters) to the path for executables can exacerbate this.


Dr. Gregory Guthrie
Maharishi International University
----------------------------------------------------------------

-----Original Message-----
From: Haskell-Cafe <haskell-cafe-bounces at haskell.org> On Behalf Of Marian Jancar
Sent: Wednesday, December 30, 2020 1:02 PM
To: haskell-cafe at haskell.org
Subject: Re: [Haskell-cafe] ghc/cabal problems - mystery?

I think you are hitting on
https://docs.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation

On 12/30/20 6:28 PM, Gregory Guthrie wrote:
> I reported several odd and inconsistent results that I can't understand, and after some further trials, a few more data points, but still confused.
>
> A directory of files, cabal build runs fine, then trying to execute; I 
> get three different results;
>
>       Linking D:\CS\Courses\long path\All Solutions\dist-newstyle\build\x86_64-windows\ghc-8.10.1\apl-0.0.1\build\apl\apl.exe ...
> Seems fine.
>
> Then; from that same shell (PS) in the same directory -  From cabal 
> run: Fails
>      PS D:\CS\Courses\long path\All Solutions> cabal run
>      Up to date
>      D:\CS\Courses\long path\All 
> Solutions\dist-newstyle\build\x86_64-windows\ghc-8.10.1\apl-0.0.1\buil
> d\apl\apl: createProcess: invalid argument (Invalid argument)
>
>  From using the explicit path: Fails
>      PS D:\CS\Courses\long path\All Solutions> dist-newstyle\build\x86_64-windows\ghc-8.10.1\apl-0.0.1\build\apl\apl.exe
>      Program 'apl.exe' failed to run: The application has failed to start because its side-by-side configuration
>      is incorrect. Please see the application event log or use the command-line sxstrace.exe tool for more
>      detailAt line:1 char:1
>      + dist-newstyle\build\x86_64-windows\ghc-8.10.1\apl-0.0.1\build\apl\apl ...
>      + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.
>      At line:1 char:1
>      + dist-newstyle\build\x86_64-windows\ghc-8.10.1\apl-0.0.1\build\apl\apl ...
>      + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>      + CategoryInfo          : ResourceUnavailable: (:) [], ApplicationFailedException
>      + FullyQualifiedErrorId : NativeCommandFailed
>
>  From going to the dist folder: runs fine.
>     PS D:\CS\Courses\long path\All Solutions> cd dist-newstyle\build\x86_64-windows\ghc-8.10.1\apl-0.0.1\build\apl
>     PS D:\CS\Courses\long path\All Solutions\dist-newstyle\build\x86_64-windows\ghc-8.10.1\apl-0.0.1\build\apl> apl.exe
>     "APL: Examples and labs"
>
> I get a few other errors & results sometimes; copy the full directory 
> to somewhere else, "cabal clean", And it won't build, "no target specified", even though the entire folder is identical.
>
> Again; every time just copying the entire directory, no editing of any files, just running cabal as above.
> Any hints or ideas why I am getting these issues & errors?
>
> GHC 8.10.2
> Cabal 3.2.0.0
> (Windows 10)
> ----------------------------------------------------------------------
> --
> PS: One more...
> I (again) copied the entire directory to another place and retested, in that case "cabal run" did run, but gave results from a different file in the directory (multiple tests there, only one run from Main.hs, same .cabal file), and can run it by explicit path or "cabal run".
>
> All results should be "DSem_imp", one is from a different file, "DSem_impc" ??
> Certainly looks like they should all be running the same apl.exe. ??
>
> Output""
> PS G:\Testing\All Solutions> cabal clean PS G:\Testing\All Solutions> 
> cabal run Resolving dependencies...
> Build profile: -w ghc-8.10.2 -O1
> In order, the following will be built (use -v for more details):
>   - apl-0.0.1 (exe:apl) (first run)
> Configuring apl-0.0.1...
> Preprocessing executable 'apl' for apl-0.0.1..
> Building executable 'apl' for apl-0.0.1..
> ...
> Linking G:\Testing\All Solutions\dist-newstyle\build\x86_64-windows\ghc-8.10.2\apl-0.0.1\build\apl\apl.exe ...
> "APL: Examples and labs"
> "======================"
> "------ APL:: DSem_imp"
>
> PS G:\Testing\All Solutions> 
> dist-newstyle\build\x86_64-windows\ghc-8.10.2\apl-0.0.1\build\apl\apl.
> exe
> "APL: Examples and labs"
> "======================"
> "------ APL:: DSem_imp"
>
> PS G:\Testing\All Solutions> cd 
> dist-newstyle\build\x86_64-windows\ghc-8.10.2\apl-0.0.1\build\apl
> PS G:\Testing\All Solutions\dist-newstyle\build\x86_64-windows\ghc-8.10.2\apl-0.0.1\build\apl> ls
>      Directory: G:\Testing\All Solutions\dist-newstyle\build\x86_64-windows\ghc-8.10.2\apl-0.0.1\build\apl
> Mode                 LastWriteTime         Length Name
> ----                 -------------         ------ ----
> d-----        12/30/2020  12:18 PM                apl-tmp
> d-----        12/30/2020  12:17 PM                autogen
> -a----        12/30/2020  12:18 PM       11230184 apl.exe
> PS G:\Testing\All 
> Solutions\dist-newstyle\build\x86_64-windows\ghc-8.10.2\apl-0.0.1\buil
> d\apl> apl.exe
> "APL: Examples and labs"
> "======================"
> "------ APL:: DSem_impc"
>
>
>
> Gregory Guthrie
> Maharishi International University
> ----------------------------------------------------------------
>
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