scons: Add "--no-duplicate-sources" option to SConstruct in util/

Patch [1] caused building util/m5 to fail due to the flag was not
an option in the SConstruct file. It is apparently the case for other
programs in util/ relying on scons.

This patch fixes the above problem, and also adheres to the default
behavior introduced by [2].

[1] This patch introduced the "--no-duplicate-sources" flag to the
scons build in util/
https://gem5-review.googlesource.com/c/public/gem5/+/68518

[2] This patch turns this flag off by default,
https://gem5-review.googlesource.com/c/public/gem5/+/69717

Change-Id: I51376f7b3bf06438b7bc7ff84bc599deecac5bd1
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/69797
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Alex Richardson <alexrichardson@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Ayaz Akram <yazakram@ucdavis.edu>

util/m5/SConstruct

@@ -49,6 +49,9 @@ AddOption('--debug-build', dest='debug_build', action='store_true',
 AddOption('--run-tests', dest='run_tests', action='store_true',
           help='Enable test output xml files as build targets.')
 AddOption('--verbose', dest='verbose', action='store_true')
+AddOption('--no-duplicate-sources', action='store_false', default=True,
+          dest='duplicate_sources',
+          help='Do not create symlinks to sources in the build directory')
 
 # Universal settings.
 if GetOption('debug_build'):

util/statetrace/SConstruct

@@ -57,6 +57,12 @@ main['CXXFLAGS'] = "-O3 -ggdb $_CPPINCFLAGS"
 
 main['CXX'] = ARGUMENTS.get('CXX', main['CXX'])
 
+# An option not to link source files in the build directory.
+# Not enabled by default.
+AddOption('--no-duplicate-sources', action='store_false', default=True,
+          dest='duplicate_sources',
+          help='Do not create symlinks to sources in the build directory')
+
 for arch in arches:
     env = main.Clone()
     env['CXX'] = ARGUMENTS.get(arch.upper() + 'CXX', env['CXX'])

util/tlm/SConstruct

@@ -80,6 +80,12 @@ sys.path.append(gem5_root + '/src/python')
 AddOption('--no-colors', dest='use_colors', action='store_false',
           help="Don't add color to abbreviated scons output")
 
+# An option not to link source files in the build directory.
+# Not enabled by default.
+AddOption('--no-duplicate-sources', action='store_false', default=True,
+          dest='duplicate_sources',
+          help='Do not create symlinks to sources in the build directory')
+
 env.SConsignFile('build/systemc/sconsign')
 SConscript(gem5_root + '/ext/systemc/SConscript',
            variant_dir='build/systemc',