Re: Lwt installation error

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

A quick answer here is that the compiler switches are no longer necessary to 
build the Xen backend.  Instead, the 4.00.1 switch or a system installation is 
sufficient.

The latest Mirage releases have a virtual package (mirage-unix or mirage-xen), 
of which only one can be installed. Similarly, there is a (mirage-net-direct | 
mirage-net-socket) which both provide a mirage-net library.

You can create "fast" compiler switches without recompiling the compiler in 
OPAM by

$ opam switch 4.00.1            # this will build a new compiler
$ opam switch myxen -a 4.00.1   # this will alias the 4.00.1 compiler

You can use fast aliases to maintain lightweight chroots of the packages you 
want, so you can have mirage-unix installed in one, and mirage-xen in the other.

(the docs on the webpage are almost certainly wrong -- I'm patching Mirari at 
the moment to simplify the build by outputting Makefiles, and then will update 
it all after testing).

Let me know if you need any more help with this...

-anil

On 25 Jun 2013, at 14:30, Dimosthenis Pediaditakis 
<dimosthenis.pediaditakis@xxxxxxxxxxxx> wrote:

> Hi everyone,
> has anyone had recently any problems installing 'lwt 2.4.3' against 
> '4.00.1+mirage-xen' (using opam)?
> 
> Thanks,
> Dimos
> 
> 
> ---------------------------
>    Error message
> ---------------------------
> ocamlfind ocamlc -c -g -I src/core -package unix -package camlp4 -package 
> bigarray -syntax camlp4o -ppopt syntax/pa_lwt_options.cmo -ppopt 
> syntax/pa_lwt.cmo -ppopt syntax/pa_lwt_log.cmo -ppopt syntax/pa_optcomp.cmo 
> -I src/unix -I src/core -o src/unix/lwt_bytes.cmo src/unix/lwt_bytes.ml
> + ocamlfind ocamlc -c -g -I src/core -package unix -package camlp4 -package 
> bigarray -syntax camlp4o -ppopt syntax/pa_lwt_options.cmo -ppopt 
> syntax/pa_lwt.cmo -ppopt syntax/pa_lwt_log.cmo -ppopt syntax/pa_optcomp.cmo 
> -I src/unix -I src/core -o src/unix/lwt_bytes.cmo src/unix/lwt_bytes.ml
> File "src/unix/lwt_bytes.ml", line 273, characters 2-17:
> Error: Unbound value Array1.map_file
> Command exited with code 2.
> 
> ----------------------------------------------------
>    lines 273-273 src/unix/lwt_bytes.ml
> ----------------------------------------------------
> let map_file ~fd ?pos ~shared ?(size=(-1)) () =
>  Array1.map_file fd ?pos char c_layout shared size
> 
> ---------------------------
>   System Info
> ---------------------------
> - Ubuntu server 12.10
> - Kernel 3.5.0-34-generic  x86_64
> - OCaml version: 4.00.1
> - Opam version: 1.0.0
> - Opam repositories:
>  [git]   mirage-dev     git://github.com/mirage/opam-repo-dev
>  [http]     default     http://opam.ocamlpro.com
> - Installed ocaml packages:
>      libcryptgps-ocaml-dev,  libcryptokit-ocaml, libcryptokit-ocaml-dev,   
> libfindlib-ocaml,   libfindlib-ocaml-dev, liblwt-glib-ocaml,  
> liblwt-glib-ocaml-dev,  liblwt-ocaml, liblwt-ocaml-dev,   liblwt-ocaml-doc, 
> liblwt-ssl-ocaml, liblwt-ssl-ocaml-dev,    libnethttpd-ocaml-dev, 
> libobrowser-ocaml-dev,    libocamlnet-ocaml, libocamlnet-ocaml-dev,    
> libocamlnet-ocaml-doc, libocsigen-ocaml,    libocsigen-ocaml-dev, 
> libocsigen-ocaml-doc,    libocsigen-xhtml-ocaml-dev, libocsigenserver-ocaml,  
>   libocsigenserver-ocaml-dev, libpcre-ocaml,    libpcre-ocaml-dev,    
> libreact-ocaml, libreact-ocaml-dev,    libsqlite3-ocaml,    
> libsqlite3-ocaml-dev, libssl-ocaml,    libssl-ocaml-dev,    libtext-ocaml, 
> libtext-ocaml-dev,    libtyxml-ocaml,    libtyxml-ocaml-dev, libzip-ocaml,    
> libzip-ocaml-dev,    ocaml,    ocaml-base, ocaml-base-nox,    
> ocaml-compiler-libs,    ocaml-findlib, ocaml-interp,    ocaml-nox,    
> ocamlduce,    ocamlduce-base
> 
> 
> 
>