[flang-commits] [flang] [OpenMP][Flang] Emit default declare mappers implicitly for derived types (PR #140562)

[Akash Banerjee via flang-commits]

================
@@ -2348,6 +2348,122 @@ genSingleOp(lower::AbstractConverter &converter, lower::SymMap &symTable,
       queue, item, clauseOps);
 }
 
+static mlir::FlatSymbolRefAttr
+genImplicitDefaultDeclareMapper(lower::AbstractConverter &converter,
----------------
TIFitis wrote:

It shouldn't be used with use_device_ptr and other such clauses as they don't support a declare mapper.

At the moment it's only used when the user hasn't made any effort to map a derived type. This can't be used in tangent with explicit map clause as map-type composition can cause divergence from the user's intention.

This is only mean't to help map derived types, especially, allocatables of derived types and nested derived types when no other mapping information is available.

https://github.com/llvm/llvm-project/pull/140562