fix(logging): LOG_LEVEL doesn't work (#505)

fixs error : LOG_LEVEL doesn't work

Author: xiaguan

src/include/common/logger.h

@@ -54,13 +54,13 @@ static constexpr auto PastLastSlash(cstr a) -> cstr { return PastLastSlash(a, a)
   })
 
 // Log levels.
-static constexpr int LOG_LEVEL_OFF = 1000;
-static constexpr int LOG_LEVEL_ERROR = 500;
-static constexpr int LOG_LEVEL_WARN = 400;
-static constexpr int LOG_LEVEL_INFO = 300;
-static constexpr int LOG_LEVEL_DEBUG = 200;
-static constexpr int LOG_LEVEL_TRACE = 100;
-static constexpr int LOG_LEVEL_ALL = 0;
+#define LOG_LEVEL_OFF 1000
+#define LOG_LEVEL_ERROR 500
+#define LOG_LEVEL_WARN 400
+#define LOG_LEVEL_INFO 300
+#define LOG_LEVEL_DEBUG 200
+#define LOG_LEVEL_TRACE 100
+#define LOG_LEVEL_ALL 0
 
 #define LOG_LOG_TIME_FORMAT "%Y-%m-%d %H:%M:%S"
 #define LOG_OUTPUT_STREAM stdout
@@ -71,11 +71,11 @@ static constexpr int LOG_LEVEL_ALL = 0;
 // #pragma message("Warning: LOG_LEVEL compile option was not explicitly
 // given.")
 #ifndef NDEBUG
+#define LOG_LEVEL LOG_LEVEL_DEBUG
 // #pragma message("LOG_LEVEL_DEBUG is used instead as DEBUG option is on.")
-static constexpr int LOG_LEVEL = LOG_LEVEL_DEBUG;
 #else
 // #pragma message("LOG_LEVEL_WARN is used instead as DEBUG option is off.")
-static constexpr int LOG_LEVEL = LOG_LEVEL_INFO;
+#define LOG_LEVEL LOG_LEVEL_INFO
 #endif
 // #pragma message("Give LOG_LEVEL compile option to overwrite the default
 // level.")