chore(oxcaml): nix based oxcaml ci

.github/workflows/workflow.yml

@@ -369,3 +369,22 @@ jobs:
           restore-prefixes-first-match: nix-${{ runner.os }}-${{ github.job }}-
           gc-max-store-size-linux: 5G
       - run: nix develop .#microbench -c make dune build bench/micro
+
+  oxcaml-test:
+    name: OxCaml
+    needs: nix-build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: nixbuild/nix-quick-install-action@v34
+        with:
+          nix_conf: ${{ env.EXTRA_NIX_CONFIG }}
+      - uses: nix-community/cache-nix-action@v6
+        with:
+          primary-key: |
+            nix-${{ runner.os }}-${{ github.job }}-${{ hashFiles('**/*.nix', '**/flake.lock') }}
+          restore-prefixes-first-match: nix-${{ runner.os }}-${{ github.job }}-
+          gc-max-store-size-linux: 2G
+      - run: |
+          nix develop .#ox-minimal -c ocaml --version
+          nix develop .#ox-minimal -c make test-ox

Makefile

@@ -112,6 +112,9 @@ test-all: $(BIN)
 test-all-sans-melange: $(BIN)
 	$(BIN) build @runtest @runtest-js @runtest-coq
 
+test-ox: $(BIN)
+	$(BIN) runtest test/blackbox-tests/test-cases/oxcaml
+
 .PHONY: check
 check: $(BIN)
 	@$(BIN) build @check

test/blackbox-tests/test-cases/oxcaml/library-field-parameters.t

@@ -383,10 +383,8 @@ A library can have more parameters than its dependencies:
   > (library (name lib2) (parameters a b c) (libraries lib))
   > EOF
 
-  $ ocamlc_where="$(ocamlc -where)"
-  $ export BUILD_PATH_PREFIX_MAP="/OCAMLC_WHERE=$ocamlc_where:$BUILD_PATH_PREFIX_MAP"
-  $ melc_compiler="$(which melc)" &> /dev/null
-  $ export BUILD_PATH_PREFIX_MAP="/MELC_COMPILER=$melc_compiler:$BUILD_PATH_PREFIX_MAP"
+We expect to see the parameter flag in the merlin config:
+
   $ dune build
   $ dune ocaml dump-dot-merlin lib2 | grep 'parameter'
   # FLG -parameter A -parameter B -parameter C