Add test case for symbol menu for local enumerators

Ada will normally present a menu to the user to allow manual
disambiguation of symbols.  The AdaCore internal GDB had a bug that
prevented this from happening.  Although this bug is not in the FSF
GDB, it seemed worthwhile to write a test case to ensure this.

gdb/testsuite/ChangeLog
2021-01-25  Tom Tromey  <tromey@adacore.com>

	* gdb.ada/local-enum.exp: New file.
	* gdb.ada/local-enum/local.adb: New file.

gdb/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2021-01-25  Tom Tromey  <tromey@adacore.com>
+
+	* gdb.ada/local-enum.exp: New file.
+	* gdb.ada/local-enum/local.adb: New file.
+
 2021-01-23  Tom Tromey  <tom@tromey.com>
 
 	* lib/gdb.exp (default_gdb_init): Set INPUTRC to a cached file.

gdb/testsuite/gdb.ada/local-enum.exp

@@ -0,0 +1,83 @@
+# Copyright 2021 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/>.
+
+load_lib "ada.exp"
+
+if { [skip_ada_tests] } { return -1 }
+
+standard_ada_testfile local
+
+if {[gdb_compile_ada "${srcfile}" "${binfile}" executable debug] != ""} {
+  return -1
+}
+
+clean_restart ${testfile}
+
+set bp_location [gdb_get_line_number "STOP" ${testdir}/local.adb]
+if ![runto "local.adb:$bp_location" ] then {
+  perror "Couldn't run ${testfile}"
+  return
+}
+
+# The test has two constants named 'three', with different values.
+# This prints one of them and checks the value.  WHICH_ENUM is the
+# name of the enum, either "e1" or "e2".
+proc print_three {which_enum value} {
+    # We don't know which in order gdb will print the constants, so
+    # adapt to either.
+    set menu1 [multi_line \
+		   "Multiple matches for three" \
+		   "\\\[0\\\] cancel" \
+		   "\\\[1\\\] local\\.e2'\\(three\\) \\(enumeral\\)" \
+		   "\\\[2\\\] local\\.e1'\\(three\\) \\(enumeral\\)" \
+		   "> $"]
+    set menu2 [multi_line \
+		   "Multiple matches for three" \
+		   "\\\[0\\\] cancel" \
+		   "\\\[1\\\] local\\.e1'\\(three\\) \\(enumeral\\)" \
+		   "\\\[2\\\] local\\.e2'\\(three\\) \\(enumeral\\)" \
+		   "> $"]
+
+    set index -1
+    set test_name "menu for test index $which_enum"
+    gdb_test_multiple "print/d three" $test_name {
+	-re $menu1 {
+	    pass $test_name
+	    if {$which_enum == "e1"} {
+		set index 2
+	    } else {
+		set index 1
+	    }
+	}
+	-re $menu2 {
+	    pass $test_name
+	    if {$which_enum == "e1"} {
+		set index 1
+	    } else {
+		set index 2
+	    }
+	}
+	default {
+	    fail $test_name
+	}
+    }
+
+    if {$index != -1} {
+	gdb_test $index " = $value"
+    }
+}
+
+print_three e2 0
+print_three e1 2

gdb/testsuite/gdb.ada/local-enum/local.adb

@@ -0,0 +1,28 @@
+--  Copyright 2021 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/>.
+
+procedure Local is
+  type E1 is (one, two, three);
+  type E2 is (three, four, five);
+
+  type A1 is array (E1) of Integer;
+  type A2 is array (E2) of Integer;
+
+  V1 : A1 := (0, 1, 2);
+  V2 : A2 := (3, 4, 5);
+
+begin
+  null; -- STOP
+end Local;