[PATCH] Fortran: reject invalid CHARACTER length of derived type components [PR96024]

[Harald Anlauf <anlauf@gmx.de>]

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Dear all,

the attached simple patch detects and rejects CHARACTER components
of derived types whose length specification is non-integer.

Regtested on x86_64-pc-linux-gnu.  OK for mainline?

This PR is also marked as a 10/11/12/13 regression, so I would
like to backport this as far as it seems reasonable.

Thanks,
Harald


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From 0a392415cb5d5486e3e660880c81d6fdbbb47285 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Tue, 21 Feb 2023 22:06:33 +0100
Subject: [PATCH] Fortran: reject invalid CHARACTER length of derived type
 components [PR96024]

gcc/fortran/ChangeLog:

	PR fortran/96024
	* resolve.cc (resolve_component): The type of a CHARACTER length
	expression must be INTEGER.

gcc/testsuite/ChangeLog:

	PR fortran/96024
	* gfortran.dg/pr96024.f90: New test.
---
 gcc/fortran/resolve.cc                | 13 +++++++++++++
 gcc/testsuite/gfortran.dg/pr96024.f90 | 11 +++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 gcc/testsuite/gfortran.dg/pr96024.f90

diff --git a/gcc/fortran/resolve.cc b/gcc/fortran/resolve.cc
index 427f901a438..2780c82c798 100644
--- a/gcc/fortran/resolve.cc
+++ b/gcc/fortran/resolve.cc
@@ -14892,6 +14892,19 @@ resolve_component (gfc_component *c, gfc_symbol *sym)
                     c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
          return false;
        }
+
+     if (c->ts.u.cl->length && c->ts.u.cl->length->ts.type != BT_INTEGER)
+       {
+	 if (!c->ts.u.cl->length->error)
+	   {
+	     gfc_error ("Character length expression of component %qs at %L "
+			"must be of INTEGER type, found %s",
+			c->name, &c->ts.u.cl->length->where,
+			gfc_basic_typename (c->ts.u.cl->length->ts.type));
+	     c->ts.u.cl->length->error = 1;
+	   }
+	 return false;
+       }
     }

   if (c->ts.type == BT_CHARACTER && c->ts.deferred
diff --git a/gcc/testsuite/gfortran.dg/pr96024.f90 b/gcc/testsuite/gfortran.dg/pr96024.f90
new file mode 100644
index 00000000000..2c914a997f2
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr96024.f90
@@ -0,0 +1,11 @@
+! { dg-do compile }
+! PR fortran/96024 - ICE in mio_name_expr_t
+! Contributed by G.Steinmetz
+
+module m
+  implicit none
+  type t
+     character(char(1)) :: a ! { dg-error "must be of INTEGER type" }
+  end type
+  type(t) :: z = t('a')
+end
--
2.35.3