[gdb/dap] Fix dap for python < 3.8
commitfc21e0f029c51687c2b4ca686d0b773ad5efeff4
authorTom de Vries <tdevries@suse.de>
Tue, 26 Sep 2023 13:51:27 +0000 (26 15:51 +0200)
committerTom de Vries <tdevries@suse.de>
Tue, 26 Sep 2023 13:51:27 +0000 (26 15:51 +0200)
tree948fcfcc2008492779fab21734c34ac261dfe811
parentd5fa6e8c6cb82b03f20dd521f70dcc7fefe573dc
[gdb/dap] Fix dap for python < 3.8

With any gdb.dap test and python 3.6 I run into:
...
Error occurred in Python: 'code' object has no attribute 'co_posonlyargcount'
ERROR: eof reading json header
...

The attribute is not supported before python 3.8, which introduced the
"Positional−only Parameters" concept.

Fix this by using try/except AttributeError.

Tested on x86_64-linux:
- openSUSE Leap 15.4 with python 3.6, and
- openSUSE Tumbleweed with python 3.11.5.

Approved-By: Tom Tromey <tom@tromey.com>
gdb/python/lib/gdb/dap/server.py