[binutils-gdb] gdb/testsuite: make gdb.tui/gdb.sh work with dash

[Simon Marchi]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=7b67c40b51b36aea807261018ffb7b24065d5619

commit 7b67c40b51b36aea807261018ffb7b24065d5619
Author: Simon Marchi <simon.marchi@polymtl.ca>
Date:   Wed Oct 8 21:49:50 2025 -0400

    gdb/testsuite: make gdb.tui/gdb.sh work with dash
    
    gdb.tui/gdb.sh (used by test gdb.tui/tuiterm-2.exp) doesn't run well
    when /bin/sh is dash:
    
        $ bash testsuite/gdb.tui/gdb.sh
        foo^C
        $ dash testsuite/gdb.tui/gdb.sh
        footestsuite/gdb.tui/gdb.sh: 20: read: arg count
    
    shellcheck actually points it out:
    
        In testsuite/gdb.tui/gdb.sh line 20:
        read
        ^--^ SC3061 (warning): In POSIX sh, read without a variable is undefined.
        ^--^ SC2162 (info): read without -r will mangle backslashes.
    
    Fix the issue by passing the `_` dummy variable.  Using that particular
    variable will not cause shellcheck to whine about it being unused.  Also
    add `-r` to make it happy.
    
    Change-Id: Ida3eddbfa3473487743fc96615baf735b4773738

Diff:
---
 gdb/testsuite/gdb.tui/gdb.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.tui/gdb.sh b/gdb/testsuite/gdb.tui/gdb.sh
index 0079a3fb441..32a4e8a98a7 100755
--- a/gdb/testsuite/gdb.tui/gdb.sh
+++ b/gdb/testsuite/gdb.tui/gdb.sh
@@ -17,4 +17,4 @@
 
 printf "foo\033(%%5"
 
-read
+read -r _