[binutils-gdb] gdb/testsuite: fix test failure when building against readline v7

[Andrew Burgess <aburgess@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=47b8bb38fcb8ea1df70a932f7fe9fedca8993ec7

commit 47b8bb38fcb8ea1df70a932f7fe9fedca8993ec7
Author: Andrew Burgess <aburgess@redhat.com>
Date:   Sat Mar 26 13:41:33 2022 +0000

    gdb/testsuite: fix test failure when building against readline v7
    
    The test added in the commit:
    
      commit a6b413d24ccc5d76179bab866834e11fd6fec294
      Date:   Fri Mar 11 14:44:03 2022 +0000
    
          gdb: work around prompt corruption caused by bracketed-paste-mode
    
    Was not written with readline 7 in mind, only readline 8+.  Between
    readline 7 and 8 the escape sequence used to disable bracketed paste
    mode changed, an additional '\r' character was added to the end.  In
    fact, it was the addition of this '\r' character that triggered the
    issue for which the above commit is part of the solution.
    
    Anyway, the test tries to spot the case where the output from GDB is
    not perfect, but does have the above work around applied.  However,
    the pattern in the test assumes that the problematic '\r' will be
    present, and this is only true for readline 8+.  With readline 7 the
    test was failing.
    
    In this commit I generalise the pattern a little so that the test will
    still KFAIL with readline 7.
    
    It's a little unfortunate that the test is KFAILing with readline 7,
    as without the problematic '\r' there's actually no reason that GDB
    couldn't "do the right thing" in this case, in which case, the test
    would PASS, but that would require changes within GDB itself.
    
    My preference then is that initially we patch the test to get it
    KFAILing, then in a separate commit I can modify GDB so that it can
    PASS with readline 7.

Diff:
---
 gdb/testsuite/gdb.base/eof-exit.exp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.base/eof-exit.exp b/gdb/testsuite/gdb.base/eof-exit.exp
index d604d029974..2d9530ccebe 100644
--- a/gdb/testsuite/gdb.base/eof-exit.exp
+++ b/gdb/testsuite/gdb.base/eof-exit.exp
@@ -38,7 +38,7 @@ proc run_test {} {
 	-re "$::gdb_prompt \[^\n\]*\r\[^\n\]*quit" {
 	    fail "$gdb_test_name (misplaced \\r)"
 	}
-	-re "$::gdb_prompt \[^\n\]*\r\[^\n\]*\r\nquit\r\n" {
+	-re "$::gdb_prompt (?:\[^\n\]*\r)?\[^\n\]*\r\nquit\r\n" {
 	    # For versions of readline that don't include the
 	    # RL_STATE_EOF patch, then the 'quit' is printed on the
 	    # subsequent line.