Re: [PATCH] Fix logic in exec_file_locate_attach

[Gary Benson <gbenson@redhat.com>]

Pedro Alves wrote:
> On 02/18/2016 05:05 PM, Gary Benson wrote:
> > 	* exec.c (exec_file_locate_attach): Throw error if
> > 	exec_file_find fails to locate the main executable.
> 
> This goes back to:
>   https://sourceware.org/ml/gdb-patches/2016-02/msg00413.html
> 
> Why is this an error, that even makes us stop the attach process
> halfway, if the case when we don't know the file name is completely
> silent? :

Hmmm, I was trying to fix a test failure, but looking at it with fresh
eyes this morning it would've been better to fix up that test as the
resulting state is more usable without a throw.  This is with throw:

  (gdb) set sysroot /whatever
  (gdb) attach 31954
  Attaching to process 31954
  ../attach-bad-sysroot: in sysroot "/whatever": No such file or directory.
  (gdb) bt
  #0  0xb54aca20 in ?? ()
  Backtrace stopped: Cannot access memory at address 0x25ae1df8
  (gdb)

This is without throw:

  (gdb) set sysroot /whatever
  (gdb) attach 31954
  Attaching to process 31954
  warning: Could not load vsyscall page because no executable was specified
  try using the "file" command first.
  0x00000039b54aca20 in ?? ()
  (gdb) bt
  #0  0x00000039b54aca20 in ?? ()
  #1  0x00000039b54ac8b0 in ?? ()
  #2  0x0000000000000000 in ?? ()
  (gdb) 

So without the throw you can backtrace.  Also, not throwing will I
think fix things for Luis without adding TRY..CATCH in remote.c.
I'll rework and resubmit.

Cheers,
Gary

-- 
http://gbenson.net/