http://sourceware.org/ml/gdb-patches/2012-09/msg00403.html

gdb/ChangeLog

        * breakpoint.c (update_global_location_list): Ignore previous
        duplicate status of a breakpoint when starting a new scan for
        duplicate breakpoints.

gdb/testsuite/ChangeLog

        * gdb.base/duplicate-bp.c: New file.
        * gdb.base/duplicate-bp.exp: New file.

2 files changed, 197 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.base/duplicate-bp.c b/gdb/testsuite/gdb.base/duplicate-bp.c
new file mode 100644
index 0000000..662a7c4
--- /dev/null
+++ b/gdb/testsuite/gdb.base/duplicate-bp.c
@@ -0,0 +1,40 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   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/>.  */
+
+void
+spacer ()
+{
+  /* Nothing.  */
+}
+
+void
+breakpt ()
+{
+  /* Nothing.  */
+}
+
+int
+main ()
+{
+  spacer ();
+
+  breakpt ();
+
+  spacer ();
+
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.base/duplicate-bp.exp b/gdb/testsuite/gdb.base/duplicate-bp.exp
new file mode 100644
index 0000000..4769efc
--- /dev/null
+++ b/gdb/testsuite/gdb.base/duplicate-bp.exp
@@ -0,0 +1,157 @@
+# 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/>.
+
+standard_testfile
+
+if { [prepare_for_testing ${testfile}.exp ${testfile}] } {
+    return -1
+}
+
+# Setup for the test, create COUNT breakpoints at the function BREAKPT.
+proc test_setup { count } {
+    global srcfile
+    global binfile
+
+    clean_restart ${binfile}
+
+    if ![runto_main] then {
+	fail "can't run to main"
+	return 0
+    }
+
+    for {set i 1} {$i <= $count} {incr i} {
+	gdb_breakpoint "breakpt"
+	gdb_test_no_output "set \$bp_num_${i} = \$bpnum"
+    }
+
+    gdb_test "step" \
+	"spacer \\(\\) at .*$srcfile:\[0-9\]+.*" \
+	"step to place breakpoints"
+
+    return 1
+}
+
+
+# Test 1: Create two breakpoints at BREAKPT.  Delete #1 and expect to stop
+# at #2.
+with_test_prefix "del_1_stop_2" {
+    test_setup 2
+
+    gdb_test_no_output {delete $bp_num_1}
+
+    gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, breakpt \\(\\) at .*$srcfile:\[0-9\]+.*" \
+	"delete #1, stop at #2"
+}
+
+# Test 2: Create two breakpoints at BREAKPT.  Delete #2 and expect to stop
+# at #1.
+with_test_prefix "del_2_stop_1" {
+    test_setup 2
+
+    gdb_test_no_output {delete $bp_num_2}
+
+    gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, breakpt \\(\\) at .*$srcfile:\[0-9\]+.*" \
+	"delete #2, stop at #1"
+}
+
+# Test 3: Create three breakpoints at BREAKPT.  Disable #1, delete #2,
+# expect to stop at #3.
+with_test_prefix "dis_1_del_2_stop_3" {
+    test_setup 3
+
+    gdb_test_no_output {disable $bp_num_1}
+
+    gdb_test "step" ".*"
+
+    gdb_test_no_output {delete $bp_num_2}
+
+    gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, breakpt \\(\\) at .*$srcfile:\[0-9\]+.*" \
+	"disable #1, delete #2, stop at #3"
+}
+
+# Test 4: Create three breakpoints at BREAKPT.  Disable #2, delete #1,
+# expect to stop at #3.
+with_test_prefix "dis_2_del_1_stop_3" {
+    test_setup 3
+
+    gdb_test_no_output {disable $bp_num_2}
+
+    gdb_test "step" ".*"
+
+    gdb_test_no_output {delete $bp_num_1}
+
+    gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, breakpt \\(\\) at .*$srcfile:\[0-9\]+.*" \
+	"disable #2, delete #1, stop at #3"
+}
+
+# Test 5: Create three breakpoints at BREAKPT.  Disable #1, delete #3,
+# expect to stop at #2.
+with_test_prefix "dis_1_del_3_stop_1" {
+    test_setup 3
+
+    gdb_test_no_output {disable $bp_num_1}
+
+    gdb_test "step" ".*"
+
+    gdb_test_no_output {delete $bp_num_3}
+
+    gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, breakpt \\(\\) at .*$srcfile:\[0-9\]+.*" \
+	"disable #1, delete #3, stop at #2"
+}
+
+# Test 6: Create three breakpoints at BREAKPT.  Disable #3, delete #1,
+# expect to stop at #2
+with_test_prefix "dis_3_del_1_stop_2" {
+    test_setup 3
+
+    gdb_test_no_output {disable $bp_num_3}
+
+    gdb_test "step" ".*"
+
+    gdb_test_no_output {delete $bp_num_1}
+
+    gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, breakpt \\(\\) at .*$srcfile:\[0-9\]+.*" \
+	"disable #3, delete #1, stop at #2"
+}
+
+# Test 7: Create three breakpoints at BREAKPT.  Disable #2, delete #3,
+# expect to stop at #1.
+with_test_prefix "dis_2_del_3_stop_1" {
+    test_setup 3
+
+    gdb_test_no_output {disable $bp_num_2}
+
+    gdb_test "step" ".*"
+
+    gdb_test_no_output {delete $bp_num_3}
+
+    gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, breakpt \\(\\) at .*$srcfile:\[0-9\]+.*" \
+	"disable #2, delete #3, stop at #1"
+}
+
+# Test 8: Create three breakpoints at BREAKPT.  Disable #3, delete #2,
+# expect to stop at #1.
+with_test_prefix "dis_3_del_2_stop_1" {
+    test_setup 3
+
+    gdb_test_no_output {disable $bp_num_3}
+
+    gdb_test "step" ".*"
+
+    gdb_test_no_output {delete $bp_num_2}
+
+    gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, breakpt \\(\\) at .*$srcfile:\[0-9\]+.*" \
+	"disable #3, delete #2, stop at #1"
+}