[gcc r12-10398] Fortran: Fix assumed length chars and len inquiry [PR103716]

[Harald Anlauf <anlauf@gcc.gnu.org>]

https://gcc.gnu.org/g:b482968801158116dd8ba3b15a4c29143b2a423a

commit r12-10398-gb482968801158116dd8ba3b15a4c29143b2a423a
Author: Paul Thomas <pault@gcc.gnu.org>
Date:   Tue May 23 06:46:37 2023 +0100

    Fortran: Fix assumed length chars and len inquiry [PR103716]
    
    2023-05-23  Paul Thomas  <pault@gcc.gnu.org>
    
    gcc/fortran
            PR fortran/103716
            * resolve.cc (gfc_resolve_ref): Conversion of array_ref into an
            element should be done for all characters without a len expr,
            not just deferred lens, and for integer expressions.
            * trans-expr.cc (conv_inquiry): For len and kind inquiry refs,
            set the se string_length to NULL_TREE.
    
    gcc/testsuite/
            PR fortran/103716
            * gfortran.dg/pr103716.f90 : New test.
    
    (cherry picked from commit 842a432b02238361ecc601d301ac400a7f30f4fa)

Diff:
---
 gcc/fortran/resolve.cc                 |  4 +++-
 gcc/fortran/trans-expr.cc              |  2 ++
 gcc/testsuite/gfortran.dg/pr103716.f90 | 15 +++++++++++++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/gcc/fortran/resolve.cc b/gcc/fortran/resolve.cc
index 9264322f671..6a7325e15e7 100644
--- a/gcc/fortran/resolve.cc
+++ b/gcc/fortran/resolve.cc
@@ -5461,7 +5461,9 @@ gfc_resolve_ref (gfc_expr *expr)
 	case REF_INQUIRY:
 	  /* Implement requirement in note 9.7 of F2018 that the result of the
 	     LEN inquiry be a scalar.  */
-	  if (ref->u.i == INQUIRY_LEN && array_ref && expr->ts.deferred)
+	  if (ref->u.i == INQUIRY_LEN && array_ref
+	      && ((expr->ts.type == BT_CHARACTER && !expr->ts.u.cl->length)
+		  || expr->ts.type == BT_INTEGER))
 	    {
 	      array_ref->u.ar.type = AR_ELEMENT;
 	      expr->rank = 0;
diff --git a/gcc/fortran/trans-expr.cc b/gcc/fortran/trans-expr.cc
index 11ee1931b8e..e78a01003c9 100644
--- a/gcc/fortran/trans-expr.cc
+++ b/gcc/fortran/trans-expr.cc
@@ -2854,11 +2854,13 @@ conv_inquiry (gfc_se * se, gfc_ref * ref, gfc_expr *expr, gfc_typespec *ts)
     case INQUIRY_KIND:
       res = build_int_cst (gfc_typenode_for_spec (&expr->ts),
 			   ts->kind);
+      se->string_length = NULL_TREE;
       break;
 
     case INQUIRY_LEN:
       res = fold_convert (gfc_typenode_for_spec (&expr->ts),
 			  se->string_length);
+      se->string_length = NULL_TREE;
       break;
 
     default:
diff --git a/gcc/testsuite/gfortran.dg/pr103716.f90 b/gcc/testsuite/gfortran.dg/pr103716.f90
new file mode 100644
index 00000000000..4f78900839e
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr103716.f90
@@ -0,0 +1,15 @@
+! { dg-do compile }
+!
+! The gimplifier used to throw a fit on thes two functions.
+!
+! Contributed by Gerhard Steinmetz  <gscfq@t-online.de>
+!
+function f1(x)
+   character(*) :: x(*)
+   print *, g(x%len)
+end
+
+function f2(x)
+   character(*) :: x(3)
+   print *, g(x%len)
+end