Support .dwp with the name of symlinked binary file

gdb/
2013-09-24  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* dwarf2read.c (open_and_init_dwp_file): Try open_dwp_file also with
	objfile->original_name.

gdb/testsuite/
2013-09-24  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.dwarf2/dwp-symlink.c: New file.
	* gdb.dwarf2/dwp-symlink.exp: New file.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2013-09-24  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* dwarf2read.c (open_and_init_dwp_file): Try open_dwp_file also with
+	objfile->original_name.
+
 2013-09-24  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	Pass down original filename for objfile.

gdb/dwarf2read.c

@@ -9648,10 +9648,21 @@ open_and_init_dwp_file (void)
   bfd *dbfd;
   struct cleanup *cleanups;
 
-  dwp_name = xstrprintf ("%s.dwp", objfile_name (dwarf2_per_objfile->objfile));
+  /* Try to find first .dwp for the binary file before any symbolic links
+     resolving.  */
+  dwp_name = xstrprintf ("%s.dwp", objfile->original_name);
   cleanups = make_cleanup (xfree, dwp_name);
 
   dbfd = open_dwp_file (dwp_name);
+  if (dbfd == NULL
+      && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
+    {
+      /* Try to find .dwp for the binary file after gdb_realpath resolving.  */
+      dwp_name = xstrprintf ("%s.dwp", objfile_name (objfile));
+      make_cleanup (xfree, dwp_name);
+      dbfd = open_dwp_file (dwp_name);
+    }
+
   if (dbfd == NULL)
     {
       if (dwarf2_read_debug)

gdb/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2013-09-24  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* gdb.dwarf2/dwp-symlink.c: New file.
+	* gdb.dwarf2/dwp-symlink.exp: New file.
+
 2013-09-20  Doug Evans  <dje@google.com>
 
 	* lib/dwarf.exp (build_executable_from_fission_assembler): New proc.

gdb/testsuite/gdb.dwarf2/dwp-symlink.c

@@ -0,0 +1,22 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 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/>.  */
+
+int
+main (int argc, char **argv)
+{
+  return 0;
+}

gdb/testsuite/gdb.dwarf2/dwp-symlink.exp

@@ -0,0 +1,77 @@
+# Copyright 2013 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/>.
+
+standard_testfile
+
+if [is_remote host] {
+    untested "remote host"
+    return 0
+}
+
+file delete [standard_output_file ${testfile}.dwp]
+if [file exists [standard_output_file ${testfile}.dwp]] {
+    unsupported "dwp file cannot be deleted"
+    return 0
+}
+if { [build_executable ${testfile}.exp ${testfile} ${srcfile}] == -1 } {
+    return -1
+}
+if ![file exists [standard_output_file ${testfile}.dwp]] {
+    unsupported "testsuite run does not produce dwp files"
+    return 0
+}
+
+set thelink "${testfile}-thelink"
+
+file delete [standard_output_file ${thelink}]
+file delete [standard_output_file ${thelink}.dwp]
+# file link is only Tcl 8.4+.
+exec "ln" "-sf" "${testfile}" "[standard_output_file $thelink]"
+if ![file exists [standard_output_file $thelink]] {
+    unsupported "host does not support symbolic links (binary symlink is missing)"
+    return 0
+}
+if [file exists [standard_output_file $thelink.dwp]] {
+    unsupported "host does not support symbolic links (we tried to delete a file and it is still there)"
+    return 0
+}
+
+clean_restart "$testfile"
+
+gdb_test "ptype main" {type = int \(int, char \*\*\)} "binary default, dwp default"
+
+clean_restart "$thelink"
+
+gdb_test "ptype main" {type = int \(int, char \*\*\)} "binary symlink, dwp default"
+
+gdb_exit
+file rename [standard_output_file ${testfile}.dwp] [standard_output_file ${thelink}.dwp]
+if [file exists [standard_output_file ${testfile}.dwp]] {
+    unsupported "host does not support symbolic links (binary symlink exists)"
+    return 0
+}
+if ![file exists [standard_output_file ${thelink}.dwp]] {
+    unsupported "host does not support symbolic links (dwp symlink is missing)"
+    return 0
+}
+
+clean_restart "$testfile"
+
+# This case cannot work.
+gdb_test "ptype main" {type = int \(\)} "binary default, dwp at symlink"
+
+clean_restart "$thelink"
+
+gdb_test "ptype main" {type = int \(int, char \*\*\)} "binary symlink, dwp at symlink"