From: Harald Anlauf <anlauf@gmx.de>
Date: Tue, 23 Feb 2021 18:09:14 +0000 (+0100)
Subject: PR fortran/99206 - ICE in add_init_expr_to_sym, at fortran/decl.c:1980
X-Git-Tag: basepoints/gcc-12~909
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a6c7e0fcffc857e67dffdd7609be663cc3aac7d2;p=thirdparty%2Fgcc.git

PR fortran/99206 - ICE in add_init_expr_to_sym, at fortran/decl.c:1980

Make sure that the string length is properly set during simplification
even when the resulting array is zero-sized.

gcc/fortran/ChangeLog:

	PR fortran/99206
	* simplify.c (gfc_simplify_reshape): Set string length for
	character arguments.

gcc/testsuite/ChangeLog:

	PR fortran/99206
	* gfortran.dg/reshape_zerosize_4.f90: New test.
---

diff --git a/gcc/fortran/simplify.c b/gcc/fortran/simplify.c
index 35f267db5885..388aca7c38cc 100644
--- a/gcc/fortran/simplify.c
+++ b/gcc/fortran/simplify.c
@@ -6887,6 +6887,8 @@ gfc_simplify_reshape (gfc_expr *source, gfc_expr *shape_exp,
 			       &source->where);
   if (source->ts.type == BT_DERIVED)
     result->ts.u.derived = source->ts.u.derived;
+  if (source->ts.type == BT_CHARACTER && result->ts.u.cl == NULL)
+    result->ts = source->ts;
   result->rank = rank;
   result->shape = gfc_get_shape (rank);
   for (i = 0; i < rank; i++)
diff --git a/gcc/testsuite/gfortran.dg/reshape_zerosize_4.f90 b/gcc/testsuite/gfortran.dg/reshape_zerosize_4.f90
new file mode 100644
index 000000000000..d9a0d2172716
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/reshape_zerosize_4.f90
@@ -0,0 +1,14 @@
+! { dg-do run }
+! PR fortran/99206 - ICE in add_init_expr_to_sym, at fortran/decl.c:1980
+! Check simplifier of RESHAPE for character arrays.
+
+program p
+  character(*),        parameter :: a(0) = reshape([  'ab'], [0])
+  character(*,kind=4), parameter :: c(0) = reshape([4_'cd'], [0])
+  if (len (a)                       /= 2) stop 1
+  if (len (reshape (  ['ab'], [0])) /= 2) stop 2
+  if (kind(reshape (  ['ab'], [0])) /= 1) stop 3
+  if (len (c)                       /= 2) stop 4
+  if (len (reshape ([4_'cd'], [0])) /= 2) stop 5
+  if (kind(reshape ([4_'cd'], [0])) /= 4) stop 6
+end