add a flag to compile containers.advanced only if sequence is installed

_oasis

@@ -41,6 +41,10 @@ Flag "bigarray"
   Description:  Build modules that depend on bigarrays
   Default:      false
 
+Flag "advanced"
+  Description:  Build advanced combinators, including CCLinq (requires "sequence")
+  Default:      true
+
 Library "containers"
   Path:             src/core
   Modules:          CCVector, CCPrint, CCError, CCHeap, CCList, CCOpt, CCPair,
@@ -86,6 +90,8 @@ Library "containers_advanced"
   Path:             src/advanced
   Pack:             true
   Modules:          CCLinq, CCBatch, CCCat, CCMonadIO
+  Build$:           flag(advanced)
+  Install$:         flag(advanced)
   FindlibName:      advanced
   FindlibParent:    containers
   BuildDepends:     containers, sequence

doc/intro.txt

@@ -101,7 +101,8 @@ Use bigarrays to hold large strings and map files directly into memory.
 
 {4 Advanced}
 
-This module is qualified with [Containers_advanced].
+This module is qualified with [Containers_advanced]. It
+requires {{:https://github.com/c-cube/sequence} Sequence}.
 
 {!modules: CCLinq CCCat CCBatch}
 

opam

@@ -5,6 +5,7 @@ build: [
     ["./configure" "--prefix" prefix "--disable-thread" "--disable-bench"
         "--disable-tests" "--%{lwt:enable}%-lwt"
         "--%{base-bigarray:enable}%-bigarray"
+        "--%{sequence:enable}%-advanced"
         "--enable-docs" "--enable-misc"]
     [make "build"]
 ]
@@ -27,7 +28,7 @@ depends: [
     "base-bytes"
     "cppo" {build}
 ]
-depopts: [ "lwt" ]
+depopts: [ "lwt" "sequence" "base-bigarray" ]
 tags: [ "stdlib" "containers" "iterators" "list" "heap" "queue" ]
 homepage: "https://github.com/c-cube/ocaml-containers/"
 doc: "http://cedeela.fr/~simon/software/containers/"