[Bug 192890] [MAINTAINER] devel/gdb thread support fix on i386 FreeBSD 9.x

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192890

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: tijl
Date: Thu Aug 21 18:35:52 UTC 2014
New revision: 365578
URL: http://svnweb.freebsd.org/changeset/ports/365578

Log:
  On FreeBSD 9.x i386 systems, debugging applications with threads causes a
  crash of gdb.

  When the libthr is loaded by gdb, the thread support want to add FreeBSD
  specific information to the current thread. Doing this, it cleans the
  thread list and re-add the current thread with the updated information
  (actually, the LWP id).
  This operation call a free of the struct thread_info (clean/init the
  thread list) and a malloc of the same struct (add the current thread).
  The problem is that a pointer to the struct thread_info is stored in
  another struct (about the execution context) and it's not updatable.

  On FreeBSD 9.x i386 systems, the malloc return a new pointer; then the
  execution context contains a broken pointer.
  On all other platform, the malloc return the same pointer and the
  execution context stays coherent.

  This patch avoids to clean the thread list and to re-add the thread; it
  just update thread information of the current thread.

  PR:        192890
  Submitted by:    luca.pizzamiglio at gmail.com (maintainer)

Changes:
  head/devel/gdb/Makefile
  head/devel/gdb/files/fbsd-threads.c

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