llvm 7.0 bindings fail to install on windows under cygwin

[travisstaloch]

I'm following along with https://llvm.org/docs/tutorial/OCamlLangImpl7.html and want to be able to

open Llvm
open Llvm_executionengine
open Llvm_target
open Llvm_scalar_opts

I have a working llvm 7 installation on the machine which is in my path and can be run from cygwin:

$ llvm-config.exe --version
7.0.0

Using opam, I was able to install the other dependencies for llvm including conf-cmake and conf-llvm along with one other i think.

Here is the output of opam install llvm

$ opam install llvm
The following actions will be performed:
  ∗ install llvm 7.0.0

<><> Gathering sources ><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[llvm.7.0.0] found in cache

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ERROR] The installation of llvm failed at "bash -ex install.sh llvm-config
        F:/Users/Travis/AppData/Local/OCaml64/home/Travis/.opam/ocaml-variants.4.07.1+mingw64c/lib
        cmake make".

#=== ERROR while installing llvm.7.0.0 ========================================#
# context     2.0.3 | win32/x86_64 | ocaml-variants.4.07.1+mingw64c | git://github.com/fdopen/opam-repository-mingw.git#opam2
# path        ~/.opam/ocaml-variants.4.07.1+mingw64c/.opam-switch/build/llvm.7.0.0
# command     F:\Users\Travis\AppData\Local\OCaml64\bin\bash.exe -ex install.sh llvm-config F:/Users/Travis/AppData/Local/OCaml64/home/Travis/.opam/ocaml-variants.4.07.1+mingw64c/lib cmake make
# exit-code   2
# env-file    ~/.opam/log/llvm-1892-05296d.env
# output-file ~/.opam/log/llvm-1892-05296d.out
### output ###
# [...]
# -- Generating done
# CMake Warning:
#   Manually-specified variables were not used by the project:
#
#     LLVM_OCAML_EXTERNAL_LLVM_LIBDIR
#     LLVM_OCAML_INSTALL_PATH
#     LLVM_OCAML_OUT_OF_TREE
#
#
# -- Build files have been written to: F:/Users/Travis/AppData/Local/OCaml64/home/Travis/.opam/ocaml-variants.4.07.1+mingw64c/.opam-switch/build/llvm.7.0.0/build
# + make ocaml_all
# make: *** No rule to make target 'ocaml_all'.  Stop.

Not sure if its related, but when I run opam update, i'm getting this error:

$ opam update

<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>
[default] synchronised from git://github.com/fdopen/opam-repository-mingw.git#opam2
[ERROR] Could not update repository "default":
        "F:\\Users\\Travis\\AppData\\Local\\OCaml64\\bin\\patch.exe -p1 -i
        /home/Travis/.opam/log/processed-patch-3444-42bb52" exited with code 2

$ opam config report
# opam config report
# opam-version      2.0.3
# self-upgrade      no
# system            arch=x86_64 os=win32 os-distribution=cygwinports os-version=10.0.17134
# solver            builtin-mccs+glpk
# install-criteria  -removed,-count[version-lag,request],-count[version-lag,changed],-changed
# upgrade-criteria  -removed,-count[version-lag,solution],-new
# jobs              7
# repositories      1 (version-controlled)
# pinned            0
# current-switch    ocaml-variants.4.07.1+mingw64c

Does anyone understand whats going on here? Is this the correct place to post this issue? Any suggestions or advice are greatly appreciated.

[dra27]

Does the error with opam update occur every single time you do an opam update - if so, please could you open an issue on https://github.com/ocaml/opam/issues and we'll go from there.

[github-actions]

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