[gcc r14-4318] libstdc++: Show full Python stack on error

[Tom Tromey <tromey@gcc.gnu.org>]

https://gcc.gnu.org/g:98db58eb0b8e78708af0770bac1053fa4fcbc5f4

commit r14-4318-g98db58eb0b8e78708af0770bac1053fa4fcbc5f4
Author: Tom Tromey <tromey@adacore.com>
Date:   Wed Sep 27 13:49:59 2023 -0600

    libstdc++: Show full Python stack on error
    
    This changes the libstdc++ test suite to arrange for gdb to show the
    full Python stack if any sort of Python exception occurs.  This makes
    debugging the printers a little simpler.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/lib/gdb-test.exp (gdb-test): Enable Python
            stack traces from gdb.

Diff:
---
 libstdc++-v3/testsuite/lib/gdb-test.exp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libstdc++-v3/testsuite/lib/gdb-test.exp b/libstdc++-v3/testsuite/lib/gdb-test.exp
index d8e572ef7b3..af7d970d388 100644
--- a/libstdc++-v3/testsuite/lib/gdb-test.exp
+++ b/libstdc++-v3/testsuite/lib/gdb-test.exp
@@ -141,6 +141,8 @@ proc gdb-test { marker {selector {}} {load_xmethods 0} } {
     puts $fd "set auto-load no"
     # Now that we've disabled auto-load, it's safe to set the target file
     puts $fd "file ./$output_file"
+    # See the full backtrace of any failures.
+    puts $fd "set python print-stack full"
     # Load & register *our* copy of the pretty-printers
     puts $fd "source $printer_code"
     puts $fd "python register_libstdcxx_printers(None)"