http://sourceware.org/ml/gdb-patches/2016-08/msg00278.html
Subject: Re: [V4 00/21] Fortran dynamic array support


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On Thu, 25 Aug 2016 19:22:17 +0200, Jan Kratochvil wrote:
> I see the source handles negative stide specially.  Particularly the comment
> here does not explain the code it comments:

With the attached patch disabling these cases still the supplied
gdb.fortran/static-arrays.exp and gdb.fortran/vla-stride.exp PASS (on Fedora 24
x86_64).


Jan

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diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index 88801ac..695825a 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -2197,12 +2197,14 @@ resolve_dynamic_type_internal (struct type *type,
     {
       struct type *range_type = TYPE_INDEX_TYPE (resolved_type);
 
+#if 0 // Fedora: gdb-vla-intel-branch-fix-stride.patch
       /* Adjust the data location with the value of byte stride if set, which
          can describe the separation between successive elements along the
          dimension.  */
       if (TYPE_BYTE_STRIDE (range_type) < 0)
         value += (TYPE_HIGH_BOUND (range_type) - TYPE_LOW_BOUND (range_type))
                   * TYPE_BYTE_STRIDE (range_type);
+#endif
 
       TYPE_DATA_LOCATION_ADDR (resolved_type) = value;
       TYPE_DATA_LOCATION_KIND (resolved_type) = PROP_CONST;
diff --git a/gdb/valarith.c b/gdb/valarith.c
index 9093969..eca7992 100644
--- a/gdb/valarith.c
+++ b/gdb/valarith.c
@@ -199,12 +199,14 @@ value_subscripted_rvalue (struct value *array, LONGEST index, int lowerbound)
 
   if (elt_stride > 0)
     elt_offs *= elt_stride;
+#if 0 // Fedora: gdb-vla-intel-branch-fix-stride.patch
   else if (elt_stride < 0)
     {
       int offs = (elt_offs + 1) * elt_stride;
 
       elt_offs = TYPE_LENGTH (array_type) + offs;
     }
+#endif
   else
     elt_offs *= elt_size;
 

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