gdb: Avoid trailing whitespace when pretty printing

While writing a new test for 'set print pretty on' I spotted that GDB
will sometimes add a trailing whitespace character when pretty
printing.  This commit removes the trailing whitespace and updates the
expected results in one tests where this was an issue.

I've added an extra test for 'set print pretty on' as it doesn't seem
to have much testing.

gdb/ChangeLog:

	* cp-valprint.c (cp_print_value_fields): Don't print trailing
	whitespace when pretty printing is on.

gdb/testsuite/ChangeLog:

	* gdb.base/finish-pretty.exp: Update expected results.
	* gdb.base/pretty-print.c: New file.
	* gdb.base/pretty-print.exp: New file.

3 files changed, 112 insertions, 1 deletions

diff --git a/gdb/testsuite/gdb.base/finish-pretty.exp b/gdb/testsuite/gdb.base/finish-pretty.exp
index c558d22..b1530cd 100644
--- a/gdb/testsuite/gdb.base/finish-pretty.exp
+++ b/gdb/testsuite/gdb.base/finish-pretty.exp
@@ -30,7 +30,7 @@ proc finish_pretty { } {
     gdb_test_no_output "set print pretty" \
 	"pretty printing switched on"
     gdb_test "finish" \
-	{.*Value returned is \$1 = \{\r\n  a = 1, \r\n  b = 2\r\n\}} \
+	{.*Value returned is \$1 = \{\r\n  a = 1,\r\n  b = 2\r\n\}} \
 	"finish foo prettyprinted function result"
 }
 
diff --git a/gdb/testsuite/gdb.base/pretty-print.c b/gdb/testsuite/gdb.base/pretty-print.c
new file mode 100644
index 0000000..9e241f8
--- /dev/null
+++ b/gdb/testsuite/gdb.base/pretty-print.c
@@ -0,0 +1,53 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2019 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/>.  */
+
+struct s1_t
+{
+  int one;
+  int two;
+
+  struct
+  {
+    union {
+      int three : 3;
+      int four : 4;
+    };
+
+    union {
+      int five : 3;
+      int six : 4;
+    };
+  } data;
+} s1 = { .one = 1, .two = 2, .data = { .three = 3, .five = 5 } };
+
+struct s2_t
+{
+  int one;
+  int two;
+
+  struct
+  {
+    int three;
+    int four;
+  };
+} s2 = { .one = 1, .two = 2, .three = 3, .four = 4 };
+
+int
+main ()
+{
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.base/pretty-print.exp b/gdb/testsuite/gdb.base/pretty-print.exp
new file mode 100644
index 0000000..91e685e
--- /dev/null
+++ b/gdb/testsuite/gdb.base/pretty-print.exp
@@ -0,0 +1,58 @@
+# Copyright 2019 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 pretty printing of structures and unions.
+
+standard_testfile
+
+if {[prepare_for_testing $testfile.exp $testfile $srcfile debug]} {
+    untested $testfile.exp
+    return -1
+}
+
+if ![runto_main] {
+    untested $testfile.exp
+    return -1
+}
+
+gdb_test_no_output "set print pretty on"
+
+gdb_test "print s1" \
+    [multi_line \
+	 " = {" \
+	 "  one = 1," \
+	 "  two = 2," \
+	 "  data = {" \
+	 "    {" \
+	 "      three = 3," \
+	 "      four = 3" \
+	 "    }," \
+	 "    {" \
+	 "      five = -3," \
+	 "      six = 5" \
+	 "    }" \
+	 "  }" \
+	 "}" ]
+
+gdb_test "print s2" \
+    [multi_line \
+	 " = {" \
+	 "  one = 1," \
+	 "  two = 2," \
+	 "  {" \
+	 "    three = 3," \
+	 "    four = 4" \
+	 "  }" \
+	 "}" ]