scons,tests: Add 'USE_TEST_OBJECTS' kconfig

This has the SimObjects defined in "src/test_objects" only be compiled
into the gem5 binary if the Kconfig 'USE_TEST_OBJECTS" == 'y'. This
happens in two cases:

1. When 'ALL/gem5' is compiled via "build_opts".
2. When tests are run via "./tests/main.py".

Change-Id: I2330008fd7c7900de5f4de142b8ac89ef4e351ce

build_opts/ALL

@@ -7,3 +7,4 @@ USE_POWER_ISA=y
 USE_RISCV_ISA=y
 USE_SPARC_ISA=y
 USE_X86_ISA=y
+USE_TEST_OBJECTS=y

src/Kconfig

@@ -51,3 +51,4 @@ rsource "arch/Kconfig"
 rsource "cpu/Kconfig"
 rsource "systemc/Kconfig"
 rsource "gpu-compute/Kconfig"
+rsource "test_objects/Kconfig"

src/test_objects/Kconfig

@@ -0,0 +1,29 @@
+# Copyright (c) 2024 The Regents of the University of California
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+config USE_TEST_OBJECTS
+    bool "SimObjects used for testing the gem5 simulator"
+    default n

tests/gem5/fixture.py

@@ -199,6 +199,24 @@ class SConsFixture(UniqueFixture):
                 log.test_log, setconfig_command, time=None, stderr=sys.stderr
             )
 
+        setconfig_add_test_obj_command = [
+            "scons",
+            "-C",
+            self.directory,
+            "--ignore-style",
+            "--no-compress-debug",
+            "setconfig",
+            self.target_dir,
+            "USE_TEST_OBJECTS=y",
+        ]
+
+        log_call(
+            log.test_log,
+            setconfig_add_test_obj_command,
+            time=None,
+            stderr=sys.stderr,
+        )
+
         command = [
             "scons",
             "-C",