ERROR while compiling ocaml-base-compiler.4.06.1

[tezzieland]

Hello, I receive always the same error message while compiling ocaml compiler 4.06.01
I'm using a Ubuntu 18.04 version on Windows 10, and I run OPAM 2.0
This is my issue:

    tezzieland@LAPTOP-DAI4LCIO:~$ opam init --compiler=4.06.1
[NOTE] Will configure from built-in defaults.
Checking for available remotes: rsync and local, git, mercurial, darcs. Perfect!

<><> Fetching repository information ><><><><><><><><><><><><><><><><><><><><><>
[default] Initialised
[NOTE] The repository 'default' will be *permanently* redirected to https://opam.ocaml.org/2.0 (opam-version >= "2.0~")
[default] Initialised

<><> Required setup - please read <><><><><><><><><><><><><><><><><><><><><><><>

  In normal operation, opam only alters files within ~/.opam.

  However, to best integrate with your system, some environment variables
  should be set. If you allow it to, this initialisation step will update
  your bash configuration by adding the following line to ~/.profile:

    test -r /home/tezzieland/.opam/opam-init/init.sh && . /home/tezzieland/.opam/opam-init/init.sh > /dev/null 2> /dev/null || true

  Otherwise, every time you want to access your opam installation, you will
  need to run:

    eval $(opam env)

  You can always re-run this setup with 'opam init' later.

Do you want opam to modify ~/.profile? [N/y/f]
(default is 'no', use 'f' to choose a different file) y
A hook can be added to opam's init scripts to ensure that the shell remains in sync with the opam environment when they
are loaded. Set that up? [y/N] y

User configuration:
  Updating ~/.profile.
[NOTE] Make sure that ~/.profile is well sourced in your ~/.bashrc.


<><> Creating initial switch (ocaml-base-compiler.4.06.1) <><><><><><><><><><><>

<><> Gathering sources ><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ocaml-base-compiler.4.06.1] downloaded from cache at https://opam.ocaml.org/2.0/cache

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
∗ installed base-bigarray.base
∗ installed base-threads.base
∗ installed base-unix.base
[ERROR] The compilation of ocaml-base-compiler failed at "/home/tezzieland/.opam/opam-init/hooks/sandbox.sh build
        ./configure -prefix /home/tezzieland/.opam/4.06.1 -with-debug-runtime".

#=== ERROR while compiling ocaml-base-compiler.4.06.1 =========================#
# context     2.0.0~rc3 | linux/x86_64 |  | https://opam.ocaml.org/2.0#a613fa1b
# path        ~/.opam/4.06.1/.opam-switch/build/ocaml-base-compiler.4.06.1
# command     ~/.opam/opam-init/hooks/sandbox.sh build ./configure -prefix /home/tezzieland/.opam/4.06.1 -with-debug-runtime
# exit-code   1
# env-file    /tmp/opam-xxx-15492/ocaml-base-compiler-15492-0325cb.env
# output-file /tmp/opam-xxx-15492/ocaml-base-compiler-15492-0325cb.out
### output ###
# bwrap: Creating new namespace failed: Invalid argument



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ λ build ocaml-base-compiler 4.06.1
└─
┌─ The following changes have been performed (the rest was aborted)
│ ∗ install base-bigarray base
│ ∗ install base-threads  base
│ ∗ install base-unix     base
└─
# Run eval $(opam env) to update the current shell environment
Switch initialisation failed: clean up? ('n' will leave the switch partially installed) [Y/n]   

[dra27]

WSL doesn't support sandboxing (see also #3376). ocaml/opam-repository#12050 (comment) contains pointers for turning it off on WSL.

[bschommer]

Beside the unsupported sandboxing the init does currently not work for me, it aborts with

<><> Fetching repository information ><><><><><><><><><><><><><><><><><><><><><>
[ERROR] Could not update repository "default": rsync failed
[ERROR] Initial download of repository failed

[rjbou]

@bschommer Is it possible you run again init on verbose mode,opam init -vv, and paste the output?

[bschommer]

Output:

./opam init -vv 4.07.0+fp+flambda --disable-sandboxing
[NOTE] Will configure from built-in defaults.
Checking for available remotes: rsync and local, git.
  - you won't be able to use mercurial repositories unless you install the hg command on your system.
  - you won't be able to use darcs repositories unless you install the darcs command on your system.


<><> Fetching repository information ><><><><><><><><><><><><><><><><><><><><><>
[ERROR] Could not update repository "default": rsync failed
[ERROR] Initial download of repository failed
'./opam init -vv 4.07.0+fp+flambda --disable-sandboxing' failed.

[rjbou]

An argument is missing, -c or --compiler= ;) Without that option, opam will take 4.07.0+fp+flambda as an opam repository, which is confirmed by the repo command

 opam repo --all
# Repository # Url                                # Switches(rank)
default      file:///tmp/4.07.0+fp+flambda <default>(1)

You can either delete your opamroot and do an init, or change default repository an create the wanted switch with

$ opam repo set-url default https://opam.ocaml.org --all
$ opam switch create 4.07.0+fp+flambda

[bschommer]

Thanks for the hint, works fine for me.

[shatyahariharan]

The opam version 2.1.0 not able to install
I have tried using the commands

$ sudo apt-get install opam
$ opam switch create 4.06.1

The error I got:

Using compiler gcc.
Configuring OCaml version 4.06.1
# Configuring for host x86_64-unknown-linux-gnu ...
# Configuring for target x86_64-unknown-linux-gnu ...
# Using compiler gcc.
# Compiler family and version: gcc-9-3.
# [ERROR!] Unable to compile the test program.
#  Make sure the C compiler gcc is properly installed.

I had installed my gcc and specified the path but still i am getting this error

[dra27]

@shatyahariharan - I'm not sure this is related to this issue, but what's the output of:

curl -sLO https://raw.githubusercontent.com/ocaml/ocaml/4.06/config/auto-aux/ansi.c
gcc -O2 -fno-strict-aliasing -fwrapv -o ansi ansi.c
./ansi

?

[shatyahariharan]

@shatyahariharan - I'm not sure this is related to this issue, but what's the output of:

curl -sLO https://raw.githubusercontent.com/ocaml/ocaml/4.06/config/auto-aux/ansi.c
gcc -O2 -fno-strict-aliasing -fwrapv -o ansi ansi.c
./ansi

?

$ gcc -O2 -fno-strict-aliasing -fwrapv -o ansi ansi.c
Error while running the above command:

as: unrecognized option '--64'

[dra27]

Your assembler is broken, or not the one gcc is expecting - you should get the error with just:

gcc -v -c -O2 -fno-strict-aliasing -fwrapv ansi.c

but with more information from gcc. Do which gcc and which as point to similar places? What's the output of gcc --version and as --version?

[shatyahariharan]

@shatyahariharan - I'm not sure this is related to this issue, but what's the output of:

curl -sLO https://raw.githubusercontent.com/ocaml/ocaml/4.06/config/auto-aux/ansi.c
gcc -O2 -fno-strict-aliasing -fwrapv -o ansi ansi.c
./ansi

?
Thanks for the hint. Error is that I had specified multiple path for the gcc.
now its working fine