[PATCH, committed] Fortran: fix checking of arguments to UNPACK when MASK is a variable [PR105813]

[Harald Anlauf <anlauf@gmx.de>]

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Dear all,

we failed to fully check arguments to UNPACK when the MASK
argument was not simplified and considered a variable instead
of an array.  The fix is a one-liner.

Regtested on x86_64-pc-linux-gnu and committed to mainline
as obvious after an OK by Steve in the PR.

Thanks,
Harald


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From f21f17f95c0237f4f987a5fa9f1fa9c7e0db3c40 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Fri, 24 Jun 2022 22:21:39 +0200
Subject: [PATCH] Fortran: fix checking of arguments to UNPACK when MASK is a
 variable [PR105813]

gcc/fortran/ChangeLog:

	PR fortran/105813
	* check.cc (gfc_check_unpack): Try to simplify MASK argument to
	UNPACK so that checking of the VECTOR argument can work when MASK
	is a variable.

gcc/testsuite/ChangeLog:

	PR fortran/105813
	* gfortran.dg/unpack_vector_1.f90: New test.
---
 gcc/fortran/check.cc                          |  2 ++
 gcc/testsuite/gfortran.dg/unpack_vector_1.f90 | 12 ++++++++++++
 2 files changed, 14 insertions(+)
 create mode 100644 gcc/testsuite/gfortran.dg/unpack_vector_1.f90

diff --git a/gcc/fortran/check.cc b/gcc/fortran/check.cc
index 0c2cb50c6a7..91d87a1b2c1 100644
--- a/gcc/fortran/check.cc
+++ b/gcc/fortran/check.cc
@@ -6353,6 +6353,8 @@ gfc_check_unpack (gfc_expr *vector, gfc_expr *mask, gfc_expr *field)
   if (!same_type_check (vector, 0, field, 2))
     return false;

+  gfc_simplify_expr (mask, 0);
+
   if (mask->expr_type == EXPR_ARRAY
       && gfc_array_size (vector, &vector_size))
     {
diff --git a/gcc/testsuite/gfortran.dg/unpack_vector_1.f90 b/gcc/testsuite/gfortran.dg/unpack_vector_1.f90
new file mode 100644
index 00000000000..5347c111e8f
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/unpack_vector_1.f90
@@ -0,0 +1,12 @@
+! { dg-do compile }
+! PR fortran/105813
+! Fix checking of VECTOR argument to UNPACK when MASK is a variable.
+! Contributed by G.Steinmetz
+
+program p
+  logical, parameter :: mask(2,2) = reshape ([.true.,  .true.,  &
+                                              .false., .true.], &
+                                              shape (mask))
+  print *, unpack ([1,2,3], mask, 0) ! OK
+  print *, unpack ([1,2],   mask, 0) ! { dg-error "must provide at least" }
+end
--
2.35.3