With what LLVM version/tag/release is cheerp based ?

I'm trying to see what cheerp changes over the LLVM project and I'm confused the build of cheerp-latest says it's clang-16:

cheerp-env clang -v
clang version 16.0.0 (https://github.com/leaningtech/cheerp-compiler 582073c5ffe5f822a5b49fb4e984f535e40fc5b5)
Target: cheerp-leaningtech-webbrowser-wasm
Thread model: posix

But when I use kdiff3 tool to see the differences between cheerp-compiler-latest / llvm-project-llvmorg-16.0.0-rc1 / llvm-project-llvmorg-16.0.0 it seems strange because in several places llvm-16.0.0-rc1 and llvm-16.0.0 are equal but cheerp-compiler-latest is different (I mean in places that apparently cheerp doesn't change anything there) like the ones bellow (notice that the differences shown bellow are only examples that I think can be used to discover the base LLVM version and it doesn't seem that cheerp also work for flang).

--- cheerp-compiler/flang/include/flang/Common/enum-set.h
+++ llvm-project-llvmorg-16.0.0-rc1/flang/include/flang/Common/enum-set.h
@@ -207,7 +207,7 @@

   template <typename STREAM>
   STREAM &Dump(
-      STREAM &o, const std::string &EnumToString(enumerationType)) const {
+      STREAM &o, std::string_view EnumToString(enumerationType)) const {
     char sep{'{'};
     IterateOverMembers([&](auto e) {
       o << sep << EnumToString(e);

--- cheerp-compiler/flang/include/flang/Evaluate/expression.h
+++ llvm-project-llvmorg-16.0.0-rc1/flang/include/flang/Evaluate/expression.h
@@ -473,20 +473,20 @@
 public:
   using Result = Type<TypeCategory::Character, KIND>;
   using Base = ArrayConstructorValues<Result>;
-  CLASS_BOILERPLATE(ArrayConstructor)
-  ArrayConstructor(Expr<SubscriptInteger> &&len, Base &&v)
-      : Base{std::move(v)}, length_{std::move(len)} {}
-  template <typename A>
-  explicit ArrayConstructor(const A &prototype)
-      : length_{prototype.LEN().value()} {}
+  DEFAULT_CONSTRUCTORS_AND_ASSIGNMENTS(ArrayConstructor)
+  explicit ArrayConstructor(Base &&values) : Base{std::move(values)} {}
+  template <typename T> explicit ArrayConstructor(const Expr<T> &) {}
+  ArrayConstructor &set_LEN(Expr<SubscriptInteger> &&);
   bool operator==(const ArrayConstructor &) const;
   static constexpr Result result() { return Result{}; }
   static constexpr DynamicType GetType() { return Result::GetType(); }
   llvm::raw_ostream &AsFortran(llvm::raw_ostream &) const;
-  const Expr<SubscriptInteger> &LEN() const { return length_.value(); }
-
-private:
-  common::CopyableIndirection<Expr<SubscriptInteger>> length_;
+  const Expr<SubscriptInteger> *LEN() const {
+    return length_ ? &length_->value() : nullptr;
+  }
+
+private:
+  std::optional<common::CopyableIndirection<Expr<SubscriptInteger>>> length_;
 };

 template <>

--- cheerp-compiler/flang/lib/Evaluate/characteristics.cpp
+++ llvm-project-llvmorg-16.0.0-rc1/flang/lib/Evaluate/characteristics.cpp
@@ -73,11 +73,10 @@
   return common::visit(
       common::visitors{
           [&](const semantics::ProcEntityDetails &proc) {
-            const semantics::ProcInterface &interface { proc.interface() };
-            if (interface.type()) {
-              return Characterize(*interface.type(), context);
-            } else if (interface.symbol()) {
-              return Characterize(*interface.symbol(), context);
+            if (proc.procInterface()) {
+              return Characterize(*proc.procInterface(), context);
+            } else if (proc.type()) {
+              return Characterize(*proc.type(), context);
             } else {
               return std::optional<TypeAndShape>{};
             }
@@ -506,8 +505,8 @@
               }
               return intrinsic;
             }
-            const semantics::ProcInterface &interface { proc.interface() };
-            if (const semantics::Symbol * interfaceSymbol{interface.symbol()}) {
+            if (const semantics::Symbol *
+                interfaceSymbol{proc.procInterface()}) {
               auto interface {
                 CharacterizeProcedure(*interfaceSymbol, context, seenProcs)
               };
@@ -517,7 +516,7 @@
               return interface;
             } else {
               result.attrs.set(Procedure::Attr::ImplicitInterface);
-              const semantics::DeclTypeSpec *type{interface.type()};
+              const semantics::DeclTypeSpec *type{proc.type()};
               if (symbol.test(semantics::Symbol::Flag::Subroutine)) {
                 // ignore any implicit typing
                 result.attrs.set(Procedure::Attr::Subroutine);
@@ -921,7 +920,7 @@
         if (whyNot) {
           *whyNot = "function results have distinct constant extents";
         }
-      } else if (!ifaceTypeShape->type().IsTkCompatibleWith(
+      } else if (!ifaceTypeShape->type().IsTkLenCompatibleWith(
                      actualTypeShape->type())) {
         if (whyNot) {
           *whyNot = "function results have incompatible types: "s +
@@ -1000,7 +999,7 @@
       auto sep{": "s};
       *whyNot = "incompatible procedure attributes";
       differences.IterateOverMembers([&](Attr x) {
-        *whyNot += sep + EnumToString(x);
+        *whyNot += sep + std::string{EnumToString(x)};
         sep = ", ";
       });
     }

leaningtech / cheerp-meta

With what LLVM version/tag/release is cheerp based ? #150