Require CI to install system packages

CHANGES.md

@@ -15,6 +15,7 @@
 - Add `dkml_target_abi` to the test matrix
 - Add `dkml-target-abi-<TARGET>` and `dkml-host-abi-<HOST>` when installing `dkml-base-compiler`. Related: Remove `ocaml_options = "ocaml-option-32bit"` for `windows_x86` matrix item that was now unused in dkml-base-compiler.
 - Remove unused `opam_abi` from the test matrix.
+- Add `--assume-depexts` during install of OCaml compiler. That means system packages are not auto-installed and your CI system will need to explicitly add any requirements like `g++-multilib gcc-multilib` for linux_x86.
 
 ## 2.1.3
 

src/scripts/setup-dkml.sh

@@ -1279,8 +1279,9 @@ do_install_compiler() {
     shift
     section_begin "install-compiler-$do_install_compiler_NAME" "Install OCaml compiler for $do_install_compiler_NAME switch"
     opamrun pin list --switch "$do_install_compiler_NAME"
-    # shellcheck disable=SC2086
-    opamrun upgrade --switch "$do_install_compiler_NAME" --yes dkml-base-compiler conf-dkml-cross-toolchain "dkml-host-abi-${dkml_host_abi}" "dkml-target-abi-${dkml_target_abi}" ${ocaml_options:-}
+    # --assume-depexts: CI needs system packages? For reproducibility do it explicitly elsewhere. Example: g++-multilib gcc-multilib for linux_x86.
+    #   shellcheck disable=SC2086
+    opamrun upgrade --switch "$do_install_compiler_NAME" --assume-depexts --yes dkml-base-compiler conf-dkml-cross-toolchain "dkml-host-abi-${dkml_host_abi}" "dkml-target-abi-${dkml_target_abi}" ${ocaml_options:-}
     section_end "install-compiler-$do_install_compiler_NAME"
 }
 do_summary() {