[PATCH v4 0/2] Make sure autoload happens before notifying Python side in new_objfile event

[Michael Weghorn <m.weghorn@posteo.de>]

This adds the possibility to explicitly specify dependencies between
observers and makes use of this to make accessing an
objfile's Python pretty printers (defined in an autoloaded script)
from a handler for the Python-side 'new_objfile' works.

This is based on top of commit f7716715f1d2a71a5c95b7ac0e0323b742692e6d
from Simon Marchi's WIP branch with some improvements to observable.h:

https://github.com/simark/binutils-gdb/tree/observer-dep

Michael Weghorn (2):
  gdbsupport: Allow to specify dependencies between observers
  gdb: Do autoload before notifying Python side in new_objfile event

 gdb/auto-load.c                               |   7 +-
 gdb/auto-load.h                               |   8 ++
 gdb/python/py-inferior.c                      |   7 +-
 ...tty-printers-in-newobjfile-event.so-gdb.py |  44 ++++++++
 ...pretty-printers-in-newobjfile-event-lib.cc |  26 +++++
 ...-pretty-printers-in-newobjfile-event-lib.h |  31 ++++++
 ...retty-printers-in-newobjfile-event-main.cc |  23 ++++
 ...ed-pretty-printers-in-newobjfile-event.exp |  96 +++++++++++++++++
 ...ded-pretty-printers-in-newobjfile-event.py |  34 ++++++
 gdb/unittests/observable-selftests.c          | 102 ++++++++++++++++++
 gdbsupport/observable.h                       |  96 ++++++++++++++---
 11 files changed, 457 insertions(+), 17 deletions(-)
 create mode 100644 gdb/testsuite/gdb.python/libpy-autoloaded-pretty-printers-in-newobjfile-event.so-gdb.py
 create mode 100644 gdb/testsuite/gdb.python/py-autoloaded-pretty-printers-in-newobjfile-event-lib.cc
 create mode 100644 gdb/testsuite/gdb.python/py-autoloaded-pretty-printers-in-newobjfile-event-lib.h
 create mode 100644 gdb/testsuite/gdb.python/py-autoloaded-pretty-printers-in-newobjfile-event-main.cc
 create mode 100644 gdb/testsuite/gdb.python/py-autoloaded-pretty-printers-in-newobjfile-event.exp
 create mode 100644 gdb/testsuite/gdb.python/py-autoloaded-pretty-printers-in-newobjfile-event.py

-- 
2.30.2