chore: replace generate/select.ml with cppo (#2763)

* chore: replace generate/select.ml with cppo

* fix dune file

* wip

* wip

* fix version

Author: anmonteiro

ORIGINS.md

@@ -51,211 +51,3 @@ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
 IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.
-
----
-
-`./src/generate` is a fork of [ppx_ast](https://github.com/janestreet/ppx_ast/tree/master/generate), which is licensed under Apache License 2.0.
-
----
-
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src/generate/dune

@@ -5,41 +5,9 @@
 
 (rule
  (targets ocaml_util.ml)
- (deps
-  ../generate/select.exe
-  ocaml_util.ml-5.2
-  ocaml_util.ml-5.1
-  ocaml_util.ml-5.0
-  ocaml_util.ml-5.00
-  ocaml_util.ml-4.14
-  ocaml_util.ml-4.13
-  ocaml_util.ml-4.12
-  ocaml_util.ml-4.11
-  ocaml_util.ml-4.10
-  ocaml_util.ml-4.09
-  ocaml_util.ml-4.08
-  ocaml_util.ml-4.07
-  ocaml_util.ml-4.06
-  ocaml_util.ml-default)
+ (deps ocaml_util.cppo.ml)
  (action
-  (with-stdout-to
-   %{targets}
-   (run
-    ../generate/select.exe
-    ocaml_util.ml-5.2
-    ocaml_util.ml-5.1
-    ocaml_util.ml-5.0
-    ocaml_util.ml-5.00
-    ocaml_util.ml-4.14
-    ocaml_util.ml-4.13
-    ocaml_util.ml-4.12
-    ocaml_util.ml-4.11
-    ocaml_util.ml-4.10
-    ocaml_util.ml-4.09
-    ocaml_util.ml-4.08
-    ocaml_util.ml-4.07
-    ocaml_util.ml-4.06
-    ocaml_util.ml-default))))
+  (run %{bin:cppo} -V OCAML:%{ocaml_version} %{deps} -o %{targets})))
 
 (menhir
  (flags --strict --inspection --unused-tokens --table --cmly)

src/generate/select.ml

@@ -0,0 +1,21 @@
+#if OCAML_VERSION >= (4,6,0)
+let warn_latin1 lexbuf =
+  Location.deprecated (Location.curr lexbuf) "ISO-Latin1 characters in identifiers"
+#else
+let warn_latin1 lexbuf =
+  Location.prerr_warning (Location.curr lexbuf)
+    (Warnings.Deprecated "ISO-Latin1 characters in identifiers")
+#endif
+
+let print_loc ppf loc =
+  Location.print_loc ppf loc
+
+
+let print_error loc f ppf x =
+#if OCAML_VERSION >= (4,8,0)
+  let error = Location.error_of_printer ~loc f x in
+  Location.print_report ppf error
+#else
+  let error = Location.error_of_printer loc f x in
+  Location.report_error ppf error
+#endif