raft: compile raft tests

Compilation is not enabled by default as it requires coroutines support
and may require special compiler (until distributed one fixes all the
bugs related to coroutines). To enable raft tests compilation new
configure.py option is added (--build-raft).

configure.py

@@ -433,13 +433,18 @@ perf_tests = set([
     'test/perf/perf_big_decimal',
 ])
 
+raft_tests = set([
+    'test/raft/replication_test',
+    'test/boost/raft_fsm_test',
+])
+
 apps = set([
     'scylla',
     'test/tools/cql_repl',
     'tools/scylla-types',
 ])
 
-tests = scylla_tests | perf_tests
+tests = scylla_tests | perf_tests | raft_tests
 
 other = set([
     'iotune',
@@ -498,6 +503,8 @@ arg_parser.add_argument('--with-antlr3', dest='antlr3_exec', action='store', def
                         help='path to antlr3 executable')
 arg_parser.add_argument('--with-ragel', dest='ragel_exec', action='store', default='ragel',
         help='path to ragel executable')
+arg_parser.add_argument('--build-raft', dest='build_raft', action='store_true', default=False,
+                        help='build raft code')
 add_tristate(arg_parser, name='stack-guards', dest='stack_guards', help='Use stack guards')
 arg_parser.add_argument('--verbose', dest='verbose', action='store_true',
                         help='Make configure.py output more verbose (useful for debugging the build process itself)')
@@ -506,6 +513,21 @@ arg_parser.add_argument('--test-repeat', dest='test_repeat', action='store', typ
 arg_parser.add_argument('--test-timeout', dest='test_timeout', action='store', type=str, default='7200')
 args = arg_parser.parse_args()
 
+coroutines_test_src = '''
+#define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
+#if GCC_VERSION < 100201
+    #error "Coroutines support requires at leat gcc 10.2.1"
+#endif
+'''
+compiler_supports_coroutines = try_compile(compiler=args.cxx, source=coroutines_test_src)
+
+if args.build_raft and not compiler_supports_coroutines:
+    raise Exception("--build-raft is requested, while the used compiler does not support coroutines")
+
+if not args.build_raft:
+    all_artifacts.difference_update(raft_tests)
+    tests.difference_update(raft_tests)
+
 defines = ['XXH_PRIVATE_API',
            'SEASTAR_TESTING_MAIN',
 ]
@@ -943,6 +965,15 @@ scylla_tests_dependencies = scylla_core + idls + scylla_tests_generic_dependenci
     'test/lib/random_schema.cc',
 ]
 
+scylla_raft_dependencies = [
+    'raft/raft.cc',
+    'raft/server.cc',
+    'raft/fsm.cc',
+    'raft/progress.cc',
+    'raft/log.cc',
+    'utils/uuid.cc'
+]
+
 deps = {
     'scylla': idls + ['main.cc', 'release.cc', 'utils/build_id.cc'] + scylla_core + api + alternator + redis,
     'test/tools/cql_repl': idls + ['test/tools/cql_repl.cc'] + scylla_core + scylla_tests_generic_dependencies,
@@ -1063,8 +1094,12 @@ deps['test/boost/linearizing_input_stream_test'] = [
 deps['test/boost/duration_test'] += ['test/lib/exception_utils.cc']
 deps['test/boost/alternator_base64_test'] += ['alternator/base64.cc']
 
+deps['test/raft/replication_test'] = ['test/raft/replication_test.cc'] + scylla_raft_dependencies
+deps['test/boost/raft_fsm_test'] =  ['test/boost/raft_fsm_test.cc', 'test/lib/log.cc'] + scylla_raft_dependencies
+
 deps['utils/gz/gen_crc_combine_table'] = ['utils/gz/gen_crc_combine_table.cc']
 
+
 warnings = [
     '-Wall',
     '-Werror',
@@ -1240,6 +1275,10 @@ args.user_cflags += ' -Wno-error=stack-usage='
 args.user_cflags += f"-ffile-prefix-map={curdir}=."
 
 seastar_cflags = args.user_cflags
+
+if build_raft:
+    seastar_cflags += ' -fcoroutines'
+
 if args.target != '':
     seastar_cflags += ' -march=' + args.target
 seastar_ldflags = args.user_ldflags
@@ -1368,6 +1407,9 @@ libs = ' '.join([maybe_static(args.staticyamlcpp, '-lyaml-cpp'), '-latomic', '-l
 if not args.staticboost:
     args.user_cflags += ' -DBOOST_TEST_DYN_LINK'
 
+if build_raft:
+    args.user_cflags += ' -DENABLE_SCYLLA_RAFT -fcoroutines'
+
 # thrift version detection, see #4538
 proc_res = subprocess.run(["thrift", "-version"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
 proc_res_output = proc_res.stdout.decode("utf-8")