[gcc r11-5275] [testsuite] Avoid Tcl 8.5-specific behavior

[Thomas Schwinge]

https://gcc.gnu.org/g:f72175357d04b0e71d2043be48551d7904a233b6

commit r11-5275-gf72175357d04b0e71d2043be48551d7904a233b6
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Mon Nov 16 17:37:06 2020 +0100

    [testsuite] Avoid Tcl 8.5-specific behavior
    
            gcc/
            * doc/install.texi (Prerequisites) <Tcl>: Add comment.
            gcc/testsuite/
            * c-c++-common/goacc/kernels-decompose-1.c: Avoid Tcl 8.5-specific
            behavior.
            * c-c++-common/goacc/kernels-decompose-2.c: Likewise.
            * gfortran.dg/goacc/kernels-decompose-1.f95: Likewise.
            * gfortran.dg/goacc/kernels-decompose-2.f95: Likewise.
            libgomp/
            * testsuite/libgomp.oacc-c-c++-common/kernels-decompose-1.c: Avoid
            Tcl 8.5-specific behavior.
            * testsuite/libgomp.oacc-fortran/pr94358-1.f90: Likewise.
    
    Reported-by: David Edelsohn <dje.gcc@gmail.com>

Diff:
---
 gcc/doc/install.texi                                              | 3 +++
 gcc/testsuite/c-c++-common/goacc/kernels-decompose-1.c            | 8 ++++++++
 gcc/testsuite/c-c++-common/goacc/kernels-decompose-2.c            | 8 ++++++++
 gcc/testsuite/gfortran.dg/goacc/kernels-decompose-1.f95           | 8 ++++++++
 gcc/testsuite/gfortran.dg/goacc/kernels-decompose-2.f95           | 8 ++++++++
 libgomp/testsuite/libgomp.oacc-c-c++-common/kernels-decompose-1.c | 8 ++++++++
 libgomp/testsuite/libgomp.oacc-fortran/pr94358-1.f90              | 8 ++++++++
 7 files changed, 51 insertions(+)

diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index cbfe859310a..8c55da373f8 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -464,6 +464,9 @@ Necessary when modifying @command{gperf} input files, e.g.@:
 @item DejaGnu 1.4.4
 @itemx Expect
 @itemx Tcl
+@c Once Tcl 8.5 or higher is required, remove any obsolete
+@c compatibility workarounds:
+@c     git grep 'compatibility with earlier Tcl releases'
 
 Necessary to run the GCC testsuite; see the section on testing for
 details.
diff --git a/gcc/testsuite/c-c++-common/goacc/kernels-decompose-1.c b/gcc/testsuite/c-c++-common/goacc/kernels-decompose-1.c
index 92db33273eb..e906443cceb 100644
--- a/gcc/testsuite/c-c++-common/goacc/kernels-decompose-1.c
+++ b/gcc/testsuite/c-c++-common/goacc/kernels-decompose-1.c
@@ -7,6 +7,14 @@
 
 /* See also '../../gfortran.dg/goacc/kernels-decompose-1.f95'.  */
 
+/* It's only with Tcl 8.5 (released in 2007) that "the variable 'varName'
+   passed to 'incr' may be unset, and in that case, it will be set to [...]",
+   so to maintain compatibility with earlier Tcl releases, we manually
+   initialize counter variables:
+   { dg-line l_dummy[variable c_loop_i 0] }
+   { dg-message "dummy" "" { target iN-VAl-Id } l_dummy } to avoid
+   "WARNING: dg-line var l_dummy defined, but not used".  */
+
 #define N 1024
 
 unsigned int a[N];
diff --git a/gcc/testsuite/c-c++-common/goacc/kernels-decompose-2.c b/gcc/testsuite/c-c++-common/goacc/kernels-decompose-2.c
index ec6c4af92aa..ec0f75c4a61 100644
--- a/gcc/testsuite/c-c++-common/goacc/kernels-decompose-2.c
+++ b/gcc/testsuite/c-c++-common/goacc/kernels-decompose-2.c
@@ -6,6 +6,14 @@
 
 /* See also '../../gfortran.dg/goacc/kernels-decompose-2.f95'.  */
 
+/* It's only with Tcl 8.5 (released in 2007) that "the variable 'varName'
+   passed to 'incr' may be unset, and in that case, it will be set to [...]",
+   so to maintain compatibility with earlier Tcl releases, we manually
+   initialize counter variables:
+   { dg-line l_dummy[variable c_loop_i 0 c_loop_j 0 c_loop_k 0 c_part 0] }
+   { dg-message "dummy" "" { target iN-VAl-Id } l_dummy } to avoid
+   "WARNING: dg-line var l_dummy defined, but not used".  */
+
 #pragma acc routine gang
 extern int
 f_g (int);
diff --git a/gcc/testsuite/gfortran.dg/goacc/kernels-decompose-1.f95 b/gcc/testsuite/gfortran.dg/goacc/kernels-decompose-1.f95
index 95a78623ebf..7e513f84083 100644
--- a/gcc/testsuite/gfortran.dg/goacc/kernels-decompose-1.f95
+++ b/gcc/testsuite/gfortran.dg/goacc/kernels-decompose-1.f95
@@ -7,6 +7,14 @@
 
 ! See also '../../c-c++-common/goacc/kernels-decompose-1.c'.
 
+! It's only with Tcl 8.5 (released in 2007) that "the variable 'varName'
+! passed to 'incr' may be unset, and in that case, it will be set to [...]",
+! so to maintain compatibility with earlier Tcl releases, we manually
+! initialize counter variables:
+! { dg-line l_dummy[variable c_loop_i 0] }
+! { dg-message "dummy" "" { target iN-VAl-Id } l_dummy } to avoid
+! "WARNING: dg-line var l_dummy defined, but not used".
+
 program main
   implicit none
   integer, parameter         :: N = 1024
diff --git a/gcc/testsuite/gfortran.dg/goacc/kernels-decompose-2.f95 b/gcc/testsuite/gfortran.dg/goacc/kernels-decompose-2.f95
index 58d687d4a0c..22f65e5c694 100644
--- a/gcc/testsuite/gfortran.dg/goacc/kernels-decompose-2.f95
+++ b/gcc/testsuite/gfortran.dg/goacc/kernels-decompose-2.f95
@@ -6,6 +6,14 @@
 
 ! See also '../../c-c++-common/goacc/kernels-decompose-2.c'.
 
+! It's only with Tcl 8.5 (released in 2007) that "the variable 'varName'
+! passed to 'incr' may be unset, and in that case, it will be set to [...]",
+! so to maintain compatibility with earlier Tcl releases, we manually
+! initialize counter variables:
+! { dg-line l_dummy[variable c_loop_i 0 c_loop_j 0 c_loop_k 0 c_part 0] }
+! { dg-message "dummy" "" { target iN-VAl-Id } l_dummy } to avoid
+! "WARNING: dg-line var l_dummy defined, but not used".
+
 program main
   implicit none
 
diff --git a/libgomp/testsuite/libgomp.oacc-c-c++-common/kernels-decompose-1.c b/libgomp/testsuite/libgomp.oacc-c-c++-common/kernels-decompose-1.c
index fa8ae6c79cd..e76e4099f3a 100644
--- a/libgomp/testsuite/libgomp.oacc-c-c++-common/kernels-decompose-1.c
+++ b/libgomp/testsuite/libgomp.oacc-c-c++-common/kernels-decompose-1.c
@@ -3,6 +3,14 @@
 /* { dg-additional-options "-fopt-info-omp-all" } */
 /* { dg-additional-options "-fopenacc-kernels=decompose" } */
 
+/* It's only with Tcl 8.5 (released in 2007) that "the variable 'varName'
+   passed to 'incr' may be unset, and in that case, it will be set to [...]",
+   so to maintain compatibility with earlier Tcl releases, we manually
+   initialize counter variables:
+   { dg-line l_dummy[variable c_loop_i 0] }
+   { dg-message "dummy" "" { target iN-VAl-Id } l_dummy } to avoid
+   "WARNING: dg-line var l_dummy defined, but not used".  */
+
 #undef NDEBUG
 #include <assert.h>
 
diff --git a/libgomp/testsuite/libgomp.oacc-fortran/pr94358-1.f90 b/libgomp/testsuite/libgomp.oacc-fortran/pr94358-1.f90
index 82d8351f0e3..99a70418a4d 100644
--- a/libgomp/testsuite/libgomp.oacc-fortran/pr94358-1.f90
+++ b/libgomp/testsuite/libgomp.oacc-fortran/pr94358-1.f90
@@ -2,6 +2,14 @@
 ! { dg-additional-options "-fopt-info-omp-all" }
 ! { dg-additional-options "-fopenacc-kernels=decompose" }
 
+! It's only with Tcl 8.5 (released in 2007) that "the variable 'varName'
+! passed to 'incr' may be unset, and in that case, it will be set to [...]",
+! so to maintain compatibility with earlier Tcl releases, we manually
+! initialize counter variables:
+! { dg-line l_dummy[variable c_loop_i 0] }
+! { dg-message "dummy" "" { target iN-VAl-Id } l_dummy } to avoid
+! "WARNING: dg-line var l_dummy defined, but not used".
+
 subroutine kernel(lo, hi, a, b, c)
   implicit none
   integer :: lo, hi, i