Comments by Sergio Durigan Junior <sergiodj@redhat.com>:

  This is the fix for RH BZ #981154

  It is mainly a testcase addition, but a minor fix in the gdb/build-id.c

  file was also needed.

  gdb/build-id.c was added by:

  commit dc294be54c96414035eed7d53dafdea0a6f31a72

  Author: Tom Tromey <tromey@redhat.com>

  Date:   Tue Oct 8 19:56:15 2013 +0000

  and had a little thinko there.  The variable 'filename' needs to be set to

  NULL after it is free'd, otherwise the code below thinks that it is still

  valid and doesn't print the necessary warning ("Try: yum install ...").

Index: gdb-7.7/gdb/testsuite/gdb.base/rhbz981154-misleading-yum-install-warning.exp

===================================================================

--- /dev/null

+++ gdb-7.7/gdb/testsuite/gdb.base/rhbz981154-misleading-yum-install-warning.exp

@@ -0,0 +1,97 @@

+#   Copyright (C) 2014  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 "normal.c"

+

+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {

+    return -1

+}

+

+# Get the build-id of the file

+set build_id_debug_file [build_id_debug_filename_get $binfile]

+regsub -all ".debug$" $build_id_debug_file "" build_id_without_debug

+

+# Run to main

+if { ![runto_main] } {

+    return -1

+}

+

+# We first need to generate a corefile

+set escapedfilename [string_to_regexp ${objdir}/${subdir}/gcore.test]

+set core_supported 0

+gdb_test_multiple "gcore ${objdir}/${subdir}/gcore.test" \

+	"save a corefile" \

+{

+  -re "Saved corefile ${escapedfilename}\[\r\n\]+$gdb_prompt $" {

+    pass "save a corefile"

+    global core_supported

+    set core_supported 1

+  }

+  -re "Can't create a corefile\[\r\n\]+$gdb_prompt $" {

+    unsupported "save a corefile"

+    global core_supported

+    set core_supported 0

+  }

+}

+

+if {!$core_supported} {

+  return -1

+}

+

+# Move the binfile to a temporary name

+remote_exec build "mv $binfile ${binfile}.old"

+

+# Reinitialize GDB and see if we get a yum warning

+gdb_exit

+gdb_start

+gdb_reinitialize_dir $srcdir/$subdir

+

+with_test_prefix "first run:" {

+    gdb_test "set build-id-verbose 1" "" \

+	"set build-id-verbose"

+

+    gdb_test "set debug-file-directory ${objdir}/${subdir}" "" \

+	"set debug-file-directory"

+

+    gdb_test "core-file ${objdir}/${subdir}/gcore.test" \

+	"Missing separate debuginfo for the main executable file\r\nTry: yum --enablerepo='\\*debug\\*' install $objdir/$subdir/$build_id_without_debug\r\n.*" \

+	"test first yum warning"

+}

+

+# Now we define and create our .build-id

+file mkdir [file dirname ${objdir}/${subdir}/${build_id_without_debug}]

+# Cannot use "file link" (from TCL) because it requires the target file to

+# exist.

+remote_exec build "ln -s $binfile ${objdir}/${subdir}/${build_id_without_debug}"

+

+# Reinitialize GDB to get the second yum warning

+gdb_exit

+gdb_start

+gdb_reinitialize_dir $srcdir/$subdir

+

+with_test_prefix "second run:" {

+    gdb_test "set build-id-verbose 1" "" \

+	"set build-id-verbose"

+

+    gdb_test "set debug-file-directory ${objdir}/${subdir}" "" \

+	"set debug-file-directory"

+

+    gdb_test "core-file ${objdir}/${subdir}/gcore.test" \

+	"Missing separate debuginfo for the main executable file\r\nTry: yum --enablerepo='\\*debug\\*' install $binfile\r\n.*" \

+	"test second yum warning"

+}

+

+# Leaving the link there will cause breakage in the next run.

+remote_exec build "rm -f ${objdir}/${subdir}/${build_id_without_debug}"

Index: gdb-7.7/gdb/build-id.c

===================================================================

--- gdb-7.7.orig/gdb/build-id.c

+++ gdb-7.7/gdb/build-id.c

@@ -588,6 +588,7 @@ build_id_to_debug_bfd (size_t build_id_l

 	  if (abfd == NULL)

 	    {

 	      xfree (filename);

+	      filename = NULL;

 	      continue;

 	    }