[PATCH v3 0/3] Add some linker namespaces conveniences

[Guinevere Larsen <guinevere@redhat.com>]

This series is a second step in improving the User Experience of
debugging inferiors with multiple namespaces. It adds 2 things to make
it more convenient for users to understand what the inferior is doing.

The first patch adds convenience variables, specifically
_active_linker_namespaces and _current_linker_namespaces. These can be
used to track where in the execution of an inferior the user is, and
could be used in breakpoint conditions to stop at a specific namespace.

The third patch adds a new command, "info linker-namespaces", to help the
user check what solibs are loaded, and where. To make the patch more
readable, the second patch is a minor refactor of the command "info
sharedlibrary".

The documentation changes have already been reviewed by Eli.

Changes for v3:
* Changed the final gdb.base/dlmopen-ns-ids.exp test to allow for linker
  namespaces that don't load libc and libm, since some systems may not
  do it.

Changes for v2:
* Renamed new command and variables to explicitly mention linker
  namespaces

Guinevere Larsen (3):
  gdb: add convenience variables around linker namespace debugging
  gdb: factor out printing a table of solibs for info sharedlibrary
  GDB: Introduce "info namespaces" command

 gdb/NEWS                                     |  11 +
 gdb/doc/gdb.texinfo                          |  28 ++
 gdb/solib-svr4.c                             |  55 ++++
 gdb/solib.c                                  | 267 ++++++++++++++-----
 gdb/solist.h                                 |   4 +
 gdb/testsuite/gdb.base/default.exp           |   2 +
 gdb/testsuite/gdb.base/dlmopen-ns-ids-main.c |   6 +
 gdb/testsuite/gdb.base/dlmopen-ns-ids.exp    | 129 +++++++++
 8 files changed, 442 insertions(+), 60 deletions(-)


base-commit: 52c5091dfb18113156d645500ab86b600f1cdfe0
-- 
2.49.0