commit d70801b4e7c81932994e7a2c4328ef7c998e2b35
author Andre Kuhlenschmidt <andre.kuhlenschmidt@gmail.com> Wed Oct 15 18:48:19 2025 -0700
committer GitHub <noreply@github.com> Wed Oct 15 18:48:19 2025 -0700
tree 539620e82bb08bc23bcdf2a784ada8dcb7021920
parent 5eba975f58d152454519bad387b2fb963659c03c

[flang][semantics] ensure defined io dummies are not arrays. (#162744)

fixes [#162709](https://github.com/llvm/llvm-project/issues/162709)

flang/lib/Semantics/check-declarations.cpp

diff --git a/flang/lib/Semantics/check-declarations.cpp b/flang/lib/Semantics/check-declarations.cpp
index ea5e2c0..31e246c 100644
--- a/flang/lib/Semantics/check-declarations.cpp
+++ b/flang/lib/Semantics/check-declarations.cpp
@@ -3622,6 +3622,7 @@
                 ioKind == common::DefinedIo::ReadUnformatted
             ? Attr::INTENT_INOUT
             : Attr::INTENT_IN);
+    CheckDioDummyIsScalar(subp, *arg);
   }
 }
 
@@ -3687,6 +3688,7 @@
           "Dummy argument '%s' of a defined input/output procedure must be assumed-length CHARACTER of default kind"_err_en_US,
           arg->name());
     }
+    CheckDioDummyIsScalar(subp, *arg);
   }
 }
 

flang/test/Semantics/io11.f90

diff --git a/flang/test/Semantics/io11.f90 b/flang/test/Semantics/io11.f90
index c00deed..6bb7a71 100644
--- a/flang/test/Semantics/io11.f90
+++ b/flang/test/Semantics/io11.f90
@@ -809,3 +809,24 @@
     end
   end interface
 end
+
+module m30
+    type base
+        character(5), allocatable :: data
+    end type
+    interface write(formatted)
+        subroutine formattedRead (dtv, unit, iotype, v_list, iostat, iomsg)
+        import base
+            !ERROR: Dummy argument 'dtv' of a defined input/output procedure must be a scalar
+            class (base), intent(in) :: dtv(10)
+            integer, intent(in) :: unit
+            !ERROR: Dummy argument 'iotype' of a defined input/output procedure must be a scalar
+            character(*), intent(in) :: iotype(2)
+            integer, intent(in) :: v_list(:)
+            !ERROR: Dummy argument 'iostat' of a defined input/output procedure must be a scalar
+            integer, intent(out) :: iostat(*)
+            !ERROR: Dummy argument 'iomsg' of a defined input/output procedure must be a scalar
+            character(*), intent(inout) :: iomsg(:)
+        end subroutine
+    end interface
+end module