unikernel/duniverse/dune_/test/blackbox-tests/test-cases/pkg/compiler-post-dependencies.t

@@ -0,0 +1,52 @@
+Exercise dune resolving the post dependencies found in compiler packages.
+
+  $ . ./helpers.sh
+  $ mkrepo
+
+  $ cat >dune-workspace << EOF
+  > (lang dune 3.16)
+  > (lock_dir
+  >  (path dune.lock)
+  >  (repositories mock)
+  >  (solver_env
+  >   (os linux)))
+  > EOF
+
+  $ mkpkg host-system-other
+
+  $ mkpkg system-mingw << EOF
+  > available: os = "win32"
+  > EOF
+
+  $ mkpkg ocaml << EOF
+  > depends: [
+  >   "ocaml-base-compiler"
+  > ]
+  > EOF
+
+This package has a dependency cycle with the "ocaml" package, broken
+by the use of post dependencies. It also contains a formula with no
+solutions when the "post" variable is set to "false" on non-windows
+systems. Opam evaluates dependency formulae with post=true and then
+does further filtering to remove post dependencies from dependency
+lists to prevent circular dependencies at package build time.
+  $ mkpkg ocaml-base-compiler << EOF
+  > depends: [
+  >  "ocaml" {post}
+  >   (("arch-x86_64" {os = "win32" & arch = "x86_64"} & "system-mingw" &
+  >     "mingw-w64-shims" {os-distribution = "cygwin" & build}) |
+  >    ("arch-x86_32" {os = "win32"} & "ocaml-option-bytecode-only" &
+  >     "system-mingw" &
+  >     "mingw-w64-shims" {os-distribution = "cygwin" & build}) |
+  >    "host-system-other" {os != "win32" & post})
+  > ]
+  > EOF
+
+  $ solve ocaml-base-compiler 
+  Solution for dune.lock:
+  - ocaml-base-compiler.0.0.1
+
+Ensure that packages can be resolved at build time. This checks that
+the dependency cycle between the "ocaml" and "ocaml-base-compiler"
+packages is successfully broken by the use of post dependencies.
+  $ dune build