[RFA] Testcase for bug report 11531

["Pierre Muller" <pierre.muller@ics-cnrs.unistra.fr>]

  Test case for the newly discovered
problem with the old CANNOT_STEP_HW_WATCHPOINTS macro
for recent Solaris.

  This leads to two failures on current x86_64-pc-solaris-2.11
(none of x86_64-pc-linux)
that disappear if I undefined the macro.

  Is it possible to commit this first or
should we first find a way to solve the problem?

  I could add a single line diff that would remove 
the macro definition in config/i386/nm-i386-sol2.h.

  The other question after is what to do with the code
and comments related to CANNOT_STEP_HW_WATCHPOINTS macro
in infrun.c source.

Pierre Muller
Pascal language support maintainer for GDB

2010-04-23  Pierre Muller  <muller@ics.u-strasbg.fr>

	PR breakpoints/11531.
	* testsuite/gdb.base/gdb11531.c: New file.
	* testsuite/gdb.base/gdb11531.exp: New file.

Index: src/gdb/testsuite/gdb.base/gdb11531.c
===================================================================
RCS file: testsuite/gdb.base/gdb11531.c
diff -N testsuite/gdb.base/gdb11531.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ src/gdb/testsuite/gdb.base/gdb11531.c	23 Apr 2010 16:17:25 -0000
@@ -0,0 +1,40 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2010 Free Software Foundation, Inc.
+
+   Contributed by Pierre Muller.
+
+   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/>.
+
+   Test for Solaris specific watchpoint problem.  */
+
+struct rec
+{
+ int x;
+ double y;
+ int z;
+};
+
+static struct rec myrec;
+
+int
+main ()
+{
+  myrec.x = 5;
+  myrec.y = 3.4;
+  myrec.z = 56;
+  myrec.x = 78;
+  return myrec.x;
+}
+
Index: src/gdb/testsuite/gdb.base/gdb11531.exp
===================================================================
RCS file: testsuite/gdb.base/gdb11531.exp
diff -N testsuite/gdb.base/gdb11531.exp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ src/gdb/testsuite/gdb.base/gdb11531.exp	23 Apr 2010 16:17:25 -0000
@@ -0,0 +1,59 @@
+# This testcase is part of GDB, the GNU debugger.
+
+# Copyright 2010 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/>.
+
+# Test GDB for Solaris specific watchpoint problem.
+
+if $tracelevel then {
+	strace $tracelevel
+}
+
+set prms_id 0
+set bug_id 0
+
+set testfile "gdb11531"
+
+if { [prepare_for_testing $testfile.exp $testfile $testfile.c {debug}] } {
+    return -1;
+}
+
+
+# Do not use run_to main
+# as this sets a breakpoint at main.
+# If the breakpoint is at the same instruction as the 
+# watchpoint value assignment
+# you can fall into the problem of the stepping over the breakpoint
+# location that can also trigger a watchpoint miss
+# This is not the problem reported here.
+
+gdb_test "start" ".*Temporary breakpoint.*"
+
+gdb_test "watch myrec.x" ".*atchpoint \[0-9\]+: myrec\.x" "Set watchpoint "
+
+gdb_test "next" \
+    "Old value = 0.*New value = 5.*" \
+    "watchpoint variable triggers at next"
+
+gdb_test "continue" \
+    "Old value = .*New value = 78.*" \
+    "watchpoint variable triggers at continue"
+
+gdb_test "continue" ".*Program exited.*" "Continue to program exit"  
+
+gdb_test "start" "" "restart"
+
+gdb_test "next" "Old value = 0.*New value = 5.*" "watchpoint triggers after
second start"
+