merge from srs2

@@ -55,6 +55,9 @@ using namespace std;
 
 using namespace _srs_internal;
 
+// the version to identify the core.
+const char* _srs_version = "XCORE-"RTMP_SIG_SRS_SERVER;
+
 #define SRS_WIKI_URL_LOG "https://github.com/ossrs/srs/wiki/v1_CN_SrsLog"
 
 // when user config an invalid value, macros to perfer true or false.
@@ -1930,7 +1933,7 @@ int SrsConfig::parse_options(int argc, char** argv)
     }
     
     // first hello message.
-    srs_trace(RTMP_SIG_SRS_SERVER);
+    srs_trace(_srs_version);
     
     if (config_file.empty()) {
         ret = ERROR_SYSTEM_CONFIG_INVALID;

@@ -58,6 +58,8 @@ ISrsThreadContext* _srs_context = new SrsThreadContext();
 // app module.
 SrsConfig* _srs_config = new SrsConfig();
 SrsServer* _srs_server = new SrsServer();
+// version of srs, which can grep keyword "XCORE"
+extern const char* _srs_version;
 
 /**
 * show the features by macro, the actual macro values.