[Bug gdb/25939] [10 regression] run fails with ICE on Solaris

["ro at CeBiTec dot Uni-Bielefeld.DE" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25939

--- Comment #4 from Rainer Orth <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #3 from Joel Brobecker <brobecker at gnat dot com> ---
> Hi Rainer,
>
> Assigning this one to you, since you seem to be on it.

At least a bit, though I haven't made much progress.  Besides, I got
distracted by the GCC 10 release process, among others.

> I see that you already pushed some changes for this PR. Does it mean we can now
> close it, or do you think there is still work to be done on that one?

The two are unrelated: those patches were for compilation failures
affecting only the very latest Solaris 11.4 updates.  This bug is about
the failure to run a program on any Solaris version, caused by the
multi-target merge.

What I've found so far is that in thread.c (add_thread_silent) the call
to find_inferior_ptid returns NULL because the all_inferiors (targ)
iterator comes up empty.

Looking further, in add_thread_silent, I see

m_target_stack = {m_top = file_stratum, m_stack = {0x20190e0
<the_dummy_target>, 0x200b8c0 <exec_ops>, 0x0, 0x0, 0x0, 0x0, 0x0}}}

i.e. the_procfs_target is missing while Linux/x86_64 has (among others)
the_amd64_linux_nat_target.

I managed to get a bit further with this patch:

diff --git a/gdb/procfs.c b/gdb/procfs.c
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -3086,6 +3090,9 @@ procfs_target::create_inferior (const ch
       shell_file = tryname;
     }

+  if (!target_is_pushed (this))
+    push_target (this);
+
   pid = fork_inferior (exec_file, allargs, env, procfs_set_exec_trap,
                       NULL, NULL, shell_file, NULL);


However, now the startup fails with

procfs: couldn't find pid 0 in procinfo list.
procfs: init_inferior, open_proc_files line 2878, /proc/6031: No such file or
directory.

I haven't got any further yet, unfortunately.

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