From 6caec7d9ec37e60e718a12934c85bac9c12757ac Mon Sep 17 00:00:00 2001
From: Steve Kargl <kargl@gcc.gnu.org>
Date: Mon, 12 Feb 2024 20:41:02 -0800
Subject: [PATCH] Fortran: Set the length of an allocatable character
PR fortran/113883
gcc/fortran/ChangeLog:
* trans-array.cc (gfc_trans_deferred_array): Set length to zero,
avoiding extraneous diagnostics.
gcc/testsuite/ChangeLog:
* gfortran.dg/allocatable_length.f90: New test.
---
gcc/fortran/trans-array.cc | 3 +++
gcc/testsuite/gfortran.dg/allocatable_length.f90 | 9 +++++++++
2 files changed, 12 insertions(+)
create mode 100644 gcc/testsuite/gfortran.dg/allocatable_length.f90
diff --git a/gcc/fortran/trans-array.cc b/gcc/fortran/trans-array.cc
index 1e0d698a9497..2181990aa04a 100644
--- a/gcc/fortran/trans-array.cc
+++ b/gcc/fortran/trans-array.cc
@@ -11531,6 +11531,9 @@ gfc_trans_deferred_array (gfc_symbol * sym, gfc_wrapped_block * block)
if (sym->ts.type == BT_CHARACTER
&& !INTEGER_CST_P (sym->ts.u.cl->backend_decl))
{
+ if (sym->ts.deferred && !sym->ts.u.cl->length)
+ gfc_add_modify (&init, sym->ts.u.cl->backend_decl,
+ build_zero_cst (TREE_TYPE (sym->ts.u.cl->backend_decl)));
gfc_conv_string_length (sym->ts.u.cl, NULL, &init);
gfc_trans_vla_type_sizes (sym, &init);
diff --git a/gcc/testsuite/gfortran.dg/allocatable_length.f90 b/gcc/testsuite/gfortran.dg/allocatable_length.f90
new file mode 100644
index 000000000000..e8b638fac880
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/allocatable_length.f90
@@ -0,0 +1,9 @@
+! { dg-do compile }
+! { dg-options "-Werror -Wall" }
+module foo
+ contains
+ subroutine bar
+ character(len=:), allocatable :: s(:)
+ call bah(s)
+ end subroutine bar
+end module foo
--
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