From 28562d99f2bc7c9418baf707c602bbf7aefbeec3 Mon Sep 17 00:00:00 2001
From: Mark Eggleston <markeggleston@gcc.gnu.org>
Date: Fri, 27 Mar 2020 11:30:40 +0000
Subject: [PATCH] fortran: ICE equivalence with an element of an array PR94030
Deferred size arrays can not be used in equivalance statements.
gcc/fortran/ChangeLog:
PR fortran/94030
* resolve.c (resolve_equivalence): Correct formatting
around the label "identical_types". Instead of using
gfc_resolve_array_spec use is_non_constants_shape_array
to determine whether the array can be used in a in an
equivalence statement.
gcc/testsuite/ChangeLog:
PR fortran/94030
* gfortran.dg/pr94030_1.f90
* gfortran.dg/pr94030_2.f90
---
gcc/fortran/resolve.c | 6 +++---
gcc/testsuite/gfortran.dg/pr94030_1.f90 | 11 +++++++++++
gcc/testsuite/gfortran.dg/pr94030_2.f90 | 33 +++++++++++++++++++++++++++++++++
3 files changed, 47 insertions(+), 3 deletions(-)
create mode 100644 gcc/testsuite/gfortran.dg/pr94030_1.f90
create mode 100644 gcc/testsuite/gfortran.dg/pr94030_2.f90
@@ -16855,7 +16855,8 @@ resolve_equivalence (gfc_equiv *eq)
&& !gfc_notify_std (GFC_STD_GNU, msg, sym->name, &e->where))
continue;
- identical_types:
+identical_types:
+
last_ts =&sym->ts;
last_where = &e->where;
@@ -16863,8 +16864,7 @@ resolve_equivalence (gfc_equiv *eq)
continue;
/* Shall not be an automatic array. */
- if (e->ref->type == REF_ARRAY
- && !gfc_resolve_array_spec (e->ref->u.ar.as, 1))
+ if (e->ref->type == REF_ARRAY && is_non_constant_shape_array (sym))
{
gfc_error ("Array %qs at %L with non-constant bounds cannot be "
"an EQUIVALENCE object", sym->name, &e->where);
new file mode 100644
@@ -0,0 +1,11 @@
+! { dg-do compile }
+!
+
+subroutine f(n)
+ integer :: n
+ integer :: arr(n)
+ integer :: i
+ equivalence (i, arr(1))
+end
+
+! { dg-error "Array 'arr' at .1. with non-constant bounds cannot be an EQUIVALENCE object" " " { target *-*-* } 8 }
new file mode 100644
@@ -0,0 +1,33 @@
+! { dg-do compile }
+!
+! Provided by Steve Kargl.
+
+subroutine foo(n,m)
+ integer, intent(in) :: n, m
+ integer a(n)
+ real b(n)
+ equivalence(a,b)
+ if (m /= 2) then
+ a = 1
+ print *, a(1)
+ else
+ b = 42.
+ print *, b(1)
+ end if
+end subroutine
+
+subroutine bar(m)
+ integer, intent(in) :: m
+ integer x(8)
+ real y(8)
+ equivalence(x,y)
+ if (m /= 2) then
+ x = 1
+ print *, x(1)
+ else
+ y = 42.
+ print *, y(1)
+ end if
+end subroutine
+
+! { dg-error "Array '.' at .1. with non-constant bounds cannot be an EQUIVALENCE object" " " { target *-*-* } 9 }
--
2.11.0