Add new gdb.ada/bp_c_mixed_case testcase for PR gdb/22670

This patch adds a new testcase to demonstrate a regression introduced by:

    commit b5ec771e60c1a0863e51eb491c85c674097e9e13
    Date:   Wed Nov 8 14:22:32 2017 +0000
    Subject: Introduce lookup_name_info and generalize Ada's FULL/WILD name matching

The purpose of the testcase is to verify that a user can insert
a breakpoint on a C function while debugging Ada, even if the name
of the function includes uppercase letters, requiring us to use
Ada's "<...>" notation to tell the GDB that the symbol name should
be looked up verbatim.

As of the commit above, GDB is no longer finding the function:

    (gdb) break <MixedCaseFunc>
    Function "<MixedCaseFunc>" not defined.
    Make breakpoint pending on future shared library load? (y or [n])

Before the patch, the breakpoint was inserted without problem.

gdb/testsuite/ChangeLog:

        PR gdb/22670
        * gdb.ada/bp_c_mixed_case: New testcase.

Tested on x86_64-linux; generates a KPASS before the regression
was introduced, and now generates a KFAIL.

gdb/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2018-01-04  Joel Brobecker  <brobecker@adacore.com>
+
+	PR gdb/22670
+	* gdb.ada/bp_c_mixed_case: New testcase.
+
 2018-01-04  Joel Brobecker  <brobecker@adacore.com>
 
 	PR gdb/22670

gdb/testsuite/gdb.ada/bp_c_mixed_case.exp

@@ -0,0 +1,52 @@
+# Copyright 2018 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"
+
+standard_ada_testfile foo_h731_021
+
+set cfile "bar"
+set csrcfile ${srcdir}/${subdir}/${testdir}/${cfile}.c
+set cobject [standard_output_file ${cfile}.o]
+
+gdb_compile "${csrcfile}" "${cobject}" object [list debug]
+if {[gdb_compile_ada "${srcfile}" "${binfile}" executable [list debug additional_flags=-largs additional_flags=${cobject} additional_flags=-margs]] != "" } {
+  return -1
+}
+
+clean_restart ${testfile}
+
+if ![runto "foo_h731_021"] then {
+  perror "Couldn't run ${testfile}"
+  return
+}
+
+# Verify that the current language is Ada.
+gdb_test "show lang" \
+         "\"auto; currently ada\"\\."
+
+# Try inserting a breakpoint inside a C function. Because the function's
+# name has some uppercase letters, we need to use the "<...>" notation.
+# The purpose of this testcase is to verify that we can in fact do so
+# and that it inserts the breakpoint at the expected location.
+setup_kfail gdb/22670 "*-*-*"
+gdb_test "break <MixedCaseFunc>" \
+         "Breakpoint $decimal at $hex: file .*bar.c, line $decimal\\."
+
+# Resume the program's execution, verifying that it lands at the expected
+# location.
+setup_kfail gdb/22670 "*-*-*"
+gdb_test "continue" \
+         "Breakpoint $decimal, MixedCaseFunc \\(\\) at .*bar\\.c:$decimal.*"

gdb/testsuite/gdb.ada/bp_c_mixed_case/bar.c

@@ -0,0 +1,21 @@
+/* Copyright 2018 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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
+MixedCaseFunc (void)
+{
+}

gdb/testsuite/gdb.ada/bp_c_mixed_case/foo_h731_021.adb

@@ -0,0 +1,21 @@
+--  Copyright 2018 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 Foo_H731_021 is
+   Procedure C_Func;
+   pragma Import (C, C_Func, "MixedCaseFunc");
+begin
+   C_Func;
+end Foo_H731_021;