Re: opam gotcha

[David Scott <scott.dj@xxxxxxxxx>]

Hi,

Thanks, I guess I should go straight to the issue tracker myself in future :-)

The problem isn't urgent for me -- now that I understand what's
happening I can easily work around it.

Thanks,
Dave

On Wed, Sep 5, 2012 at 2:26 PM, Thomas Gazagnaire
<thomas.gazagnaire@xxxxxxxxx> wrote:
> Hi Dave,
>
> Anil opened an issue on github for this: 
> https://github.com/OCamlPro/opam/issues/102
>
> I'm not totally sure how I could fix this properly, but I'll try to commit a 
> fix for this today.
>
> --
> Thomas
>
> On Sep 5, 2012, at 3:20 PM, David Scott wrote:
>
>> Hi,
>>
>> I just got bitten by this:
>>
>> 1. do some xen work:
>>
>> $ opam switch 3.12.1+mirage-xen
>>
>> To update your environment variables, you can now run:
>>
>>    $ eval `opam config -env`
>>
>> djs@debian:~/ocaml-cstruct$ opam config -env
>> PATH=/home/djs/.opam/3.12.1+mirage-xen/bin:/home/djs/mir-inst/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games;
>> export PATH;
>> OCAML_TOPLEVEL_PATH=/home/djs/.opam/3.12.1+mirage-xen/lib/toplevel;
>> export OCAML_TOPLEVEL_PATH;
>> MIRAGE_OS=xen; export MIRAGE_OS;
>> MIRAGE_NET=direct; export MIRAGE_NET;
>>
>> Note the MIRAGE_* environment variables are exported
>>
>> 2. do some system work:
>>
>> $ opam switch system
>> 3.12.1
>> /usr/lib/ocaml
>> 3.12.1
>>
>> To update your environment variables, you can now run:
>>
>>    $ eval `opam config -env`
>>
>> djs@debian:~/ocaml-cstruct$ opam config -env
>> PATH=/home/djs/.opam/system/bin:/home/djs/mir-inst/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games;
>> export PATH;
>> OCAML_TOPLEVEL_PATH=/home/djs/.opam/system/lib/toplevel; export
>> OCAML_TOPLEVEL_PATH;
>> CAML_LD_LIBRARY_PATH=/home/djs/.opam/system/lib/stublibs:/usr/lib/ocaml/stublibs;
>> export CAML_LD_LIBRARY_PATH;
>>
>> Note the MIRAGE_* environment variables are still in my environment
>> from the last time.
>>
>> 3. attempt to build cstruct, the Makefile has:
>>
>> OS ?= unix
>>
>> ifneq "$(MIRAGE_OS)" ""
>> OS := $(MIRAGE_OS)
>> endif
>>
>> ... so it does a xen build by mistake.
>>
>> I can manually unset these variables myself, now that I know I should.
>> Is there a more automatic way?
>>
>> Cheers,
>> --
>> Dave Scott
>>
>



-- 
Dave Scott