Merge GDB 7.5.1

gdb/testsuite/lib/append_gdb_boards_dir.exp

+# Copyright 2012 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Make the boards under testsuite/boards automatically available to
+# DejaGnu.  This is sourced by the `site.exp' file generated in the
+# root of the testsuite's build directory.
+
+# Append GDB's boards dir to DejaGnu's board dir list, making sure
+# that that is the last boards dir in the list, so that boards found
+# in directories appended to the list by either the global config
+# site.exp, or in `$(dirname $DEJAGNU)/boards' override GDB's boards.
+# Unfortunately, there's no standard way to get that behavior.  To
+# make it happen, we trace all writes to the $boards_dirs global, and
+# make sure our dir is always the last in the list.  This relies on
+# the fact that DejaGnu always writes to this variable, even if just
+# to set it to the empty list, which it does.
+#
+proc append_gdb_boards_dir { name1 name2 op } {
+    global srcdir
+    global boards_dir
+
+    # In case someone wants to point at GDB's boards dir in the global
+    # config before some other board dir, in which case we should not
+    # push it to the end of the list, use an unlikely path to GDB's
+    # boards, so it compares different to other simpler but equivalent
+    # paths.
+    set gdb_boards_dir "${srcdir}/boards/../boards"
+
+    # Keep our board dir last in the list.
+    set idx [lsearch -exact $boards_dir "$gdb_boards_dir"]
+    if { $idx >= 0 } {
+        set boards_dir [lreplace $boards_dir $idx $idx]
+    }
+    lappend boards_dir "${gdb_boards_dir}"
+}
+trace variable "boards_dir" w append_gdb_boards_dir