[Haskell-iPhone] Using ghc-ios with cabal sandbox

[Luke Iannini]

The arm-apple-darwin10-ghc wrapper is autogenerated during GHC installation
and I don't think ghcios changes anything there (e.g. /usr/local/bin/ghc
looks nearly identical)

Oh, here's the likely culprit: the cabal.sandbox.config hardcodes the
packages.conf.d -- e.g. in one of my projects it placed:
package-db:
/Users/lukexi/Projects/Thop/.cabal-sandbox/x86_64-osx-ghc-7.8.3-packages.conf.d




On Thu, Nov 13, 2014 at 11:32 AM, Axis Sivitz <axis at asivitz.com> wrote:

> I filed a bug: https://github.com/haskell/cabal/issues/2213
> Someone commented that it should basically work.
>
> I'm trying to track down exactly where it goes wrong for me. There's a
> problem in the way "cabal exec" interacts with the ghc-ios script.
>
> If I run...
>
> ghc-ios -v3 test.hs
> Glasgow Haskell Compiler, Version 7.8.3, stage 1 booted by GHC version
> 7.8.2
> Using binary package database:
> /usr/local/lib/arm-apple-darwin10-ghc-7.8.3/package.conf.d/package.cache
> Using binary package database:
> /Users/axis/.ghc/arm-ios-7.8.3/package.conf.d/package.cache
>
> It correctly finds the package database.
>
> But if I run...
>
> cabal exec ghc-ios -- -v3 test.hs
> Glasgow Haskell Compiler, Version 7.8.3, stage 1 booted by GHC version
> 7.8.2
> Using binary package database:
> /usr/local/lib/ghc-7.8.3/package.conf.d/package.cache
> Using binary package database:
> /Users/axis/sandbox/.cabal-sandbox/x86_64-osx-ghc-7.8.3-packages.conf.d/package.cache
>
> It correctly uses the sandbox, but not the arm ghc.
>
> I looked into /usr/local/bin/arm-apple-darwin10-ghc, which does the
> following:
>
>  #!/bin/sh
>  exedir="/usr/local/lib/arm-apple-darwin10-ghc-7.8.3/bin"
>  exeprog="ghc-stage1"
>  executablename="$exedir/$exeprog"
>  datadir="/usr/local/share"
>  bindir="/usr/local/bin"
>  topdir="/usr/local/lib/arm-apple-darwin10-ghc-7.8.3"
>  executablename="$exedir/ghc"
>  exec "$executablename" -B"$topdir" ${1+"$@"}
>
> I'm not sure what's going on at the end (what is the -B flag?), but
> somehow that topdir variable doesn't make it through the sandbox call.
>
> Thanks for your help.
>
> On Wed, Oct 15, 2014 at 9:30 PM, Axis Sivitz <axis at asivitz.com> wrote:
>
>> Oh, I think you're right, it wasn't actually installing correctly. I will
>> file a bug with cabal.
>>
>> Thanks
>>
>> On Wed, Oct 15, 2014 at 6:58 PM, Luke Iannini <lukexipd at gmail.com> wrote:
>>
>>> Hi Axis,
>>>
>>> I'm looking at my notes from my (brief) attempt to try sandboxes with
>>> ghc-ios, and it looks like one major issue is that the --builddir flag
>>> isn't paid attention to when installing into a sandbox, thus the object
>>> files from different architectures get mixed up. That will likely need a
>>> patch to cabal (I don't think many of the cabal devs are using multiple
>>> architectures/cross compilation) -- filing a bug would be great.
>>>
>>> Best
>>> Luke
>>>
>>>
>>> On Wed, Oct 15, 2014 at 1:57 PM, Axis Sivitz <axis at asivitz.com> wrote:
>>>
>>>> Is anyone using ghc-ios with cabal sandbox? I am having trouble with it.
>>>>
>>>> I can 'cabal-ios install' fine. That installs the packages properly in
>>>> the sandbox for arm and x86.
>>>>
>>>> But the ghc-ios script doesn't use the sandbox environment. And running
>>>> a simple 'cabal exec ghc-ios ...' clobbers the package-db path:
>>>>
>>>> I get...
>>>> "Using binary package database:
>>>> /.../sandbox/x86_64-osx-ghc-7.8.3-packages.conf.d/package.cache"
>>>> and then a bunch of errors like:
>>>> Bad interface file: /usr/local/lib/ghc-7.8.3/base-4.7.0.1/Prelude.hi
>>>>         magic number mismatch: old/corrupt interface file? (wanted
>>>> 129742, got 33214052)
>>>>
>>>> I guess the best solution is for cabal's exec command to respect the
>>>> arguments that cabal-ios provides. But maybe in the meantime perhaps I can
>>>> tweak the ghc-ios script to add an argument to look for the presence of
>>>> sandboxing, unless anyone else has a better idea.
>>>>
>>>> Thanks,
>>>> Axis
>>>>
>>>> _______________________________________________
>>>> iPhone mailing list
>>>> iPhone at haskell.org
>>>> http://www.haskell.org/mailman/listinfo/iphone
>>>>
>>>>
>>>
>>
>>
>> --
>> Axis Sivitz
>> http://asivitz.com <http://buttonbrigade.com/>
>> (513) 535-1668
>>
>
>
>
> --
> Axis Sivitz
> http://asivitz.com <http://buttonbrigade.com/>
> (513) 535-1668
>
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