Opam for windows: failed to install version 5.0.0

[bjeannet2]

I failed to reproduce the installation of ocaml-5.0.0 with opam 2.2.0 beta1, using the provided binary for windows, due to an ocaml exception during compilation.
Is this expected or not ? Below the details of my attempt:

I settled repositories as follows:

<><> Repository configuration for switch default ><><><><><><><><><><><><><>  🐫

 1 dra27   git+https://github.com/dra27/opam-repository#windows-5.0
 2 default git+https://github.com/fdopen/opam-repository-mingw.git#opam2

and default switch:

#  switch   compiler             description
→  default  ocaml-system.4.12.0  ocaml >= 4.05.0
   essai                         oocaml-option-mingw

I typed the command:

$ ./opam switch create essai --packages=ocaml.5.0.0,ocaml-option-mingw

<><> Installing new switch packages <><><><><><><><><><><><><><><><><><><><>  🐫

Switch invariant: ["ocaml" {= "5.0.0"} "ocaml-option-mingw"]

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><>  🐫

∗ installed base-bigarray.base
∗ installed base-threads.base
∗ installed base-unix.base
∗ installed ocaml-option-mingw.1
⬇ retrieved flexdll.0.43  (cached)
∗ installed flexdll.0.43
⬇ retrieved ocaml-variants.5.0.0+pr11846  (https://github.com/dra27/ocaml/archiv
e/win64-abi-5.0.tar.gz)
∗ installed ocaml-variants.5.0.0+pr11846
∗ installed ocaml-config.3
[ERROR] The compilation of ocaml.5.0.0 failed at "ocaml
        C:\\Users\\bjt2\\AppData\\Local\\opam\\5.0\\share\\ocaml-config/gen_ocam
l_config.ml
        5.0.0 ocaml".

#=== ERROR while compiling ocaml.5.0.0 ========================================#
# context     2.2.0~beta1 | win32/x86_64 | ocaml-option-mingw.1 | git+https://gi
thub.com/dra27/opam-repository#windows-5.0
# path        ~\AppData\Local\opam\5.0\.opam-switch\build\ocaml.5.0.0
# command     ~\AppData\Local\opam\5.0\bin\ocaml.exe C:\Users\bjt2\AppData\Local
\opam\5.0\share\ocaml-config/gen_ocaml_config.ml 5.0.0 ocaml
# exit-code   2
# env-file    ~\AppData\Local\opam\log\ocaml-21776-1362bf.env
# output-file ~\AppData\Local\opam\log\ocaml-21776-1362bf.out
### output ###
# [...]
# Called from Persistent_env.read_pers_struct in file "typing/persistent_env.ml"
, line 197, characters 12-29
# Called from Persistent_env.read in file "typing/persistent_env.ml", line 255,
characters 6-53
# Called from Env.read_signature in file "typing/env.ml", line 2513, characters
12-42
# Called from Topcommon.load_topdirs_signature in file "toplevel/topcommon.ml",
line 292, characters 11-53
# Called from Toploop.run_script in file "toplevel/toploop.ml", line 117, charac
ters 2-37
# Called from Topmain.input_argument in file "toplevel/byte/topmain.ml", line 18
1, characters 24-59
# Called from Stdlib__Arg.parse_and_expand_argv_dynamic_aux in file "arg.ml", li
ne 279, characters 11-20
# Called from Compenv.parse_arguments in file "driver/compenv.ml", line 747, cha
racters 6-78
# Re-raised at Compenv.process_deferred_actions.(fun) in file "driver/compenv.ml
", line 725, characters 34-131
# Called from Topmain.main in file "toplevel/byte/topmain.ml", line 214, charact
ers 2-61
# Called from Topmain.main in file "toplevel/byte/topmain.ml", line 223, charact
ers 8-15
# Called from Topstart in file "toplevel/topstart.ml", line 16, characters 13-29



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><>  🐫

┌─ The following actions failed
│ λ build ocaml 5.0.0
└─
┌─ The following changes have been performed (the rest was aborted)
│ ∗ install base-bigarray      base
│ ∗ install base-threads       base
│ ∗ install base-unix          base
│ ∗ install flexdll            0.43
│ ∗ install ocaml-config       3
│ ∗ install ocaml-option-mingw 1
│ ∗ install ocaml-variants     5.0.0+pr11846
└─

[dra27]

No, that's not expected! If you still have the script, please could you run opam upgrade -v so I can see the whole stack trace? If not, simply adding -v to the opam switch create should do the same thing.

[bjeannet2]

I am sorry to have bothered you: I tried again this morning, and it now works....
I am not sure what changes I did, although I made several attempts before creating the issue...
Anyway, I succeeded to install ocaml-5.0.0, (+ ctypes, zarith) (and also ocaml-5.1.0).
Congratulation for all the work done by you and your colleagues !

I still block on ocaml-5.0.0 with the installation of "conf-pkg-config".

$ ./opam install conf-pkg-config -v
The following actions will be performed:
=== install 1 package
  ∗ conf-pkg-config 2

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><>  🐫


#=== ERROR while compiling conf-pkg-config.2 ==================================#
"pkg-config": command not found.


<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><>  🐫

┌─ The following actions failed
│ λ build conf-pkg-config 2
└─
╶─ No changes have been performed
'E:\ws\cygwin64\tmp\opam.exe install conf-pkg-config -v' failed.

Although pkg-config| is in the path:

$ which pkg-config
/usr/bin/pkg-config
$ pkg-config
Please specify at least one package name on the command line.

I saw that a problem with pkg-config on windows was solved three years ago (issue #18174).
In attachement the more detailed log obtained with ./opam install conf-pkg-config -v --debug-level=1
opam.log

[fenginsc]

I can't install it either, it says it can't find gcc, how does cygwin install gcc?

[bjeannet2]

You need anyway to install x86_64-w64-mingw32-gcc using the cygwin installer

[fenginsc]

Thanks, following your tips I've successfully installed it.

[bjeannet2]

main problem solved