ocaml-re2: add initial version (112.06.00) to the system

pkgs/development/ocaml-modules/re2/Makefile.patch

···
+--- ./lib/Makefile	2014-11-18 08:16:19.000000000 -0800
++++ ./lib/Makefile	2015-05-23 14:48:31.000000000 -0700
+@@ -6,12 +6,12 @@
+ all: libre2_stubs.a dllre2_stubs.so
+ 
+ dllre2_stubs.so libre2_stubs.a: stubs.o $(LIBRE2)
+-	ocamlmklib -oc re2_stubs stubs.o $(LIBRE2) -lstdc++
++	ocamlmklib -oc re2_stubs stubs.o $(LIBRE2) -lc++
+ 	rm libre2_stubs.a # ocamlmklib just includes $(LIBRE2) inside the stubs archive
+ 	cp $(LIBRE2) libre2_stubs.a && ar r libre2_stubs.a stubs.o
+ 
+ stubs.o: stubs.cpp stubs.h util.h enum_x_macro.h
+-	g++ -O2 -DPIC -fPIC -g -pipe -DCAML_NAME_SPACE -Wall -I. -I../../../include \
++	$(CXX) -O2 -DPIC -fPIC -g -pipe -DCAML_NAME_SPACE -Wall -I. -I../../../include \
+ 	-I$(RE2_HOME) -I$(ocaml-version-selected-include-path) -c stubs.cpp
+ 
+ #stubs.o: %.o: %.cpp %.h

pkgs/development/ocaml-modules/re2/default.nix

···
+{stdenv, buildOcaml, fetchurl, ocaml, core, pa_ounit, pa_test,
+ bin_prot, comparelib, sexplib, rsync}:
+
+buildOcaml rec {
+  name = "re2";
+  version = "112.06.00";
+
+  minimumSupportedOcamlVersion = "4.00";
+
+  src = fetchurl {
+    url = "https://github.com/janestreet/re2/archive/${version}.tar.gz";
+    sha256 = "a538765872363fcb67f12b95c07455a0afd68f5ae9008b59bb85a996d97cc752";
+  };
+  patches = if stdenv.isDarwin
+            then [./Makefile.patch ./myocamlbuild.patch]
+            else null;
+
+  buildInputs = [ pa_ounit pa_test rsync ];
+  propagatedBuildInputs = [ core bin_prot comparelib sexplib ];
+
+  hasSharedObjects = true;
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/janestreet/re2;
+    description = "OCaml bindings for RE2";
+    license = stdenv.lib.licenses.asl20;
+    maintainers = [ maintainers.ericbmerritt ];
+  };
+}

pkgs/development/ocaml-modules/re2/myocamlbuild.patch

···
+--- ./myocamlbuild.ml	2015-05-23 14:35:18.000000000 -0700
++++ ./myocamlbuild.ml	2015-05-23 15:05:24.000000000 -0700
+@@ -626,16 +626,18 @@
+     rule "Generate lib/options.ml"
+       ~prod:"lib/options.ml"
+       ~deps:["lib/options.mlp"; "lib/enum_x_macro.h"]
+-      (fun _ _ -> Cmd (S[A"gcc"; A"-E"; A"-P"; A"-x"; A"c";
++      (fun _ _ -> Cmd (S[A"cc"; A"-E"; A"-P"; A"-x"; A"c";
+                          P"lib/options.mlp"; A"-o"; P"lib/options.ml"]));
+ 
+     flag ["ocaml"; "link"; "library"; "native"] (S[A"-cclib"; A"-Llib";
+                                                    A"-cclib"; A"-lre2_stubs";
+-                                                   A"-cclib"; A"-lstdc++"]);
++                                                   A"-ccopt"; A"--stdlib=libc++";
++                                                   A"-cclib"; A"-lc++"]);
+     flag ["ocaml"; "link"; "library"; "byte"]   (S[A"-dllib"; A"dllre2_stubs.so";
+                                                    A"-cclib"; A"-Llib";
+                                                    A"-cclib"; A"-lre2_stubs";
+-                                                   A"-cclib"; A"-lstdc++"]);
++                                                   A"-ccopt"; A"--stdlib=libc++";                                                   
++                                                   A"-cclib"; A"-lc++"]);
+   | _ ->
+     ()
+ 

pkgs/top-level/all-packages.nix

···
 
     ounit = callPackage ../development/ocaml-modules/ounit { };
 
+    re2 = callPackage ../development/ocaml-modules/re2 { };
+
     tyxml = callPackage ../development/ocaml-modules/tyxml { };
 
     ulex = callPackage ../development/ocaml-modules/ulex { };