From 33a7a93218b1393d0135e3c4a9ad9ced87808f5e Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Thu, 28 Jan 2021 10:13:46 +0100
Subject: [PATCH] PR fortran/86470 - ICE with OpenMP, class(*) allocatable

gfc_call_malloc should malloc an area of size 1 if no size given.

gcc/fortran/ChangeLog:

	PR fortran/86470
	* trans.c (gfc_call_malloc): Allocate area of size 1 if passed
	size is NULL (as documented).

gcc/testsuite/ChangeLog:

	PR fortran/86470
	* gfortran.dg/gomp/pr86470.f90: New test.
---
 gcc/fortran/trans.c                        |  3 +++
 gcc/testsuite/gfortran.dg/gomp/pr86470.f90 | 12 ++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 gcc/testsuite/gfortran.dg/gomp/pr86470.f90

diff --git a/gcc/fortran/trans.c b/gcc/fortran/trans.c
index a2376917635..ab53fc5f441 100644
--- a/gcc/fortran/trans.c
+++ b/gcc/fortran/trans.c
@@ -689,6 +689,9 @@ gfc_call_malloc (stmtblock_t * block, tree type, tree size)
   /* Call malloc.  */
   gfc_start_block (&block2);
 
+  if (size == NULL_TREE)
+    size = build_int_cst (size_type_node, 1);
+
   size = fold_convert (size_type_node, size);
   size = fold_build2_loc (input_location, MAX_EXPR, size_type_node, size,
 			  build_int_cst (size_type_node, 1));
diff --git a/gcc/testsuite/gfortran.dg/gomp/pr86470.f90 b/gcc/testsuite/gfortran.dg/gomp/pr86470.f90
new file mode 100644
index 00000000000..7e04437548c
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/gomp/pr86470.f90
@@ -0,0 +1,12 @@
+! { dg-do compile }
+! PR fortran/86470 - ICE with OpenMP, class(*)
+
+program p
+  implicit none
+  class(*), allocatable :: val
+!$OMP PARALLEL private(val)
+  allocate(integer::val)
+  val = 1
+  deallocate(val)
+!$OMP END PARALLEL
+end
-- 
2.30.2