dune environment vars with flake and C++ interop with stubs

3 files changed, 25 insertions, 1 deletions

diff --git a/lib/dune b/lib/dune
index 5d95cc5..3bc492f 100644
--- a/lib/dune
+++ b/lib/dune
@@ -1,2 +1,10 @@
 (library
- (name relational_engine))
+ (name relational_engine)
+ (foreign_stubs
+  (language cxx)
+  (names merklecpp_stubs)
+  (flags
+   (:standard -lssl -lcrypto)
+   (-L %{env:LIBRESSL_LIB_PATH=})
+   (-I %{env:LIBRESSL_INCLUDE_PATH=})
+   (-I %{env:MERKLECPP_INCLUDE_PATH=}))))
diff --git a/lib/hello.ml b/lib/hello.ml
new file mode 100644
index 0000000..1a3a138
--- /dev/null
+++ b/lib/hello.ml
@@ -0,0 +1 @@
+external hello : unit -> int = "hello_ocaml"
diff --git a/lib/merklecpp_stubs.cpp b/lib/merklecpp_stubs.cpp
new file mode 100644
index 0000000..4ce427e
--- /dev/null
+++ b/lib/merklecpp_stubs.cpp
@@ -0,0 +1,15 @@
+#include <iostream>
+#include <merklecpp.h>
+
+void cpp_normal_function() {
+  std::cout << "HELLO OCAML! :)" << std::endl;
+}
+
+extern "C" {
+#include <caml/mlvalues.h>
+#include <caml/memory.h>
+  extern value hello_ocaml(value unit){
+    cpp_normal_function();
+    return 0;
+  }
+}