Fortran: fix bounds check for copying of class expressions [PR106945]

In the bounds check for copying of class expressions, the number of elements
determined from a descriptor, returned as type gfc_array_index_type (i.e. a
signed type), should be converted to the type of the passed element count,
which is of type size_type_node (i.e. unsigned), for use in comparisons.

gcc/fortran/ChangeLog:

	PR fortran/106945
	* trans-expr.cc (gfc_copy_class_to_class): Convert element counts in
	bounds check to common type for comparison.

gcc/testsuite/ChangeLog:

	PR fortran/106945
	* gfortran.dg/pr106945.f90: New test.

(cherry picked from commit 2cf5f485e0351bb1faf46196a99e524688f3966e)

diff --git a/gcc/fortran/trans-expr.cc b/gcc/fortran/trans-expr.cc
index 704cbc297f75761afb896bb1e8fb68bc2606510c..057cb8a30419d14c215155407bf433dc4ceb1843 100644 (file)
--- a/gcc/fortran/trans-expr.cc
+++ b/gcc/fortran/trans-expr.cc
@@ -1531,6 +1531,7 @@ gfc_copy_class_to_class (tree from, tree to, tree nelems, bool unlimited)
            name = (const char *)(DECL_NAME (to)->identifier.id.str);
 
          from_len = gfc_conv_descriptor_size (from_data, 1);
+         from_len = fold_convert (TREE_TYPE (orig_nelems), from_len);
          tmp = fold_build2_loc (input_location, NE_EXPR,
                                  logical_type_node, from_len, orig_nelems);
          msg = xasprintf ("Array bound mismatch for dimension %d "

diff --git a/gcc/testsuite/gfortran.dg/pr106945.f90 b/gcc/testsuite/gfortran.dg/pr106945.f90
new file mode 100644 (file)
index 0000000..e760ca7
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr106945.f90
@@ -0,0 +1,11 @@
+! { dg-do compile }
+! { dg-options "-fcoarray=single -fcheck=bounds -ftrapv" }
+! PR fortran/106945
+! Contributed by G. Steinmetz
+
+module m
+  implicit none
+  type t
+     class(*), allocatable :: a[:]
+  end type
+end