[gcc r13-6306] testsuite: Fix up modules.exp [PR108899]

[Jakub Jelinek <jakub@gcc.gnu.org>]

https://gcc.gnu.org/g:5592679df783547049efc6d73727c5ff809ec302

commit r13-6306-g5592679df783547049efc6d73727c5ff809ec302
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Feb 23 17:17:05 2023 +0100

    testsuite: Fix up modules.exp [PR108899]
    
    On Wed, Feb 22, 2023 at 02:33:42PM -0300, Alexandre Oliva via Gcc-patches wrote:
    > When a multi-source module is found to be unsupported, we fail
    > module_cmi_p and subsequent sources.  Override proc unsupported to
    > mark the result in module_do, and test it to skip module_cmp_p and
    > subsequent related tests.
    >
    > for  gcc/testsuite/ChangeLog
    >
    >       * g++.dg/modules/modules.exp: Override unsupported to update
    >       module_do, and test it after dg-test.
    
    This patch breaks testing with more than one set of options in
    target board, like
    make check-g++ RUNTESTFLAGS='--target_board=unix\{-m32,-m64\} modules.exp'
    yields:
    ...
                     === g++ Summary for unix/-m32 ===
    
     # of expected passes            7217
     # of unexpected failures        1
     # of expected failures          18
     # of unsupported tests          2
     Running target unix/-m64
    ...
     ERROR: tcl error sourcing /home/jakub/src/gcc/gcc/testsuite/g++.dg/modules/modules.exp.
     ERROR: tcl error code TCL OPERATION RENAME TARGET_EXISTS
     ERROR: can't rename to "saved-unsupported": command already exists
         while executing
     "rename unsupported saved-unsupported"
         (file "/home/jakub/src/gcc/gcc/testsuite/g++.dg/modules/modules.exp" line 322)
         invoked from within
     "source /home/jakub/src/gcc/gcc/testsuite/g++.dg/modules/modules.exp"
         ("uplevel" body line 1)
         invoked from within
     "uplevel #0 source /home/jakub/src/gcc/gcc/testsuite/g++.dg/modules/modules.exp"
         invoked from within
     "catch "uplevel #0 source $test_file_name" msg"
    
    In other spots where we in *.exp files rename some routine, we guard that
    and the following patch does that for modules.exp too.
    
    Tested with running
    make check-g++ RUNTESTFLAGS='--target_board=unix\{-m32,-m64\} modules.exp'
    again which now works properly again.
    
    2023-02-23  Jakub Jelinek  <jakub@redhat.com>
    
            PR testsuite/108899
            * g++.dg/modules/modules.exp: Only override unsupported if it
            exists and saved-unsupported doesn't.

Diff:
---
 gcc/testsuite/g++.dg/modules/modules.exp | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/gcc/testsuite/g++.dg/modules/modules.exp b/gcc/testsuite/g++.dg/modules/modules.exp
index e66b2082f20..80aa392bc7f 100644
--- a/gcc/testsuite/g++.dg/modules/modules.exp
+++ b/gcc/testsuite/g++.dg/modules/modules.exp
@@ -319,11 +319,15 @@ cleanup_module_files [find $DEFAULT_REPO *.gcm]
 # so that, after an unsupported result in dg-test, we can skip rather
 # than fail subsequent related tests.
 set module_do {"compile" "P"}
-rename unsupported saved-unsupported
-proc unsupported { args } {
-    global module_do
-    lset module_do 1 "N"
-    return [saved-unsupported $args]
+if { [info procs unsupported] != [list] \
+      && [info procs saved-unsupported] == [list] } {
+    rename unsupported saved-unsupported
+
+    proc unsupported { args } {
+	global module_do
+	lset module_do 1 "N"
+	return [saved-unsupported $args]
+    }
 }
 
 # not grouped tests, sadly tcl doesn't have negated glob