Unable to build opam (2.07 and master branch) on cygwin due to cudf build error

[iBoost21]

cd ~/opam-full-2.0.7 && ./configure
checking for OCaml findlib package cudf... not found
checking for OCaml findlib package dose3.common... not found
checking for OCaml findlib package dose3.algo... not found
checking for OCaml findlib package mccs... not found

opam install cudf

#=== ERROR while compiling cudf.0.9-1 =========================================#
# context     2.0.7 | win32/x86_64 | ocaml-variants.4.10.0+mingw64 | git+https://github.com/fdopen/opam-repository-mingw.git#opam2
# path        ~/.opam/ocaml-variants.4.10.0+mingw64/.opam-switch/build/cudf.0.9-1
# command     D:\Cygwin\bin\make.exe all opt
# exit-code   2
### output ###
/ocamlbuildlib.cmxa' myocamlbuild.ml 'D:/Cygwin/home/Kevin/.opam/ocaml-variants.4.10.0+mingw64/lib/ocaml\ocamlbuild/o[...]
# D:\Cygwin\home\Kevin\.opam\ocaml-variants.4.10.0+mingw64\.opam-switch\build\cudf.0.9-1\_build\myocamlbuild.exe: "open_process_shell" failed on "\"\"D:\\Cygwin\\bin\\dash.exe\" -ec \" ocamlfind list\"\"": Exec format error
# make: *** [Makefile:61: _build/cudf.cma] Error 100

dose3 & mccs are dependent on cudf so they also cannot be built.

[dra27]

Can you give some more detail on your setup?

[iBoost21]

I'm trying to compile opam under a "fresh" latest version 64-bit Cygwin installation on Windows 10, with only those Cygwin packages installed: rsync, patch, diffutils, curl, wget, make, unzip, git, m4, perl, mingw64-x86_64-gcc-core

I followed the opam & ocaml manual installation guide on this page:
https://fdopen.github.io/opam-repository-mingw/installation/

wget https://github.com/fdopen/opam-repository-mingw/releases/download/0.0.0.2/opam64.tar.xz
tar -xf opam64.tar.xz
bash opam64/install.sh
opam init default "https://github.com/fdopen/opam-repository-mingw.git#opam2" -c "ocaml-variants.4.10.0+mingw64" --disable-sandboxing

[dra27]

What’s the result of echo $HOME?

[dra27]

Oh, never mind - it’s in one of the logs!

[dra27]

Putting the 2.2.0 spike as part of dealing with depext for native Windows (which indirectly benefits the Cygwin port of opam)

[kit-ty-kate]

Fixed since the 2.2.0~alpha release. If you're still having an issue, please feel free to reopen.