CocoaHTTPServer2.3: Implicit declaration of function 'LOG_OBJC_MAYBE' is invalid in C99

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在HTTPLogging.h文件中：

// 1、将
#import "DDLog.h"
// 替换为
#import <CocoaLumberjack/CocoaLumberjack.h>in 
// 1、将
LOG_OBJC_MAYBE
// 替换为
HTTP_LOG_OBJC_MAYBELOG_C_MAYBEHTTP_LOG_C_MAYBEHTTPLogging.h
// 3、添加
#define HTTP_LOG_OBJC_MAYBE(async, lvl, flg, ctx, frmt, ...) \
do{ if(HTTP_LOG_ASYNC_ENABLED) LOG_MAYBE(async, lvl, flg, ctx, nil, sel_getName(_cmd), frmt, ##__VA_ARGS__); } while(0)
#define HTTP_LOG_C_MAYBE(async, lvl, flg, ctx, frmt, ...) \
do{ if(HTTP_LOG_ASYNC_ENABLED) LOG_MAYBE(async, lvl, flg, ctx, nil, __FUNCTION__, frmt, ##__VA_ARGS__); } while(0)

最终的HTTPLogging.h文件为：

#import <CocoaLumberjack/CocoaLumberjack.h>

#define HTTP_LOG_OBJC_MAYBE(async, lvl, flg, ctx, frmt, ...) do{ if(HTTP_LOG_ASYNC_ENABLED) LOG_MAYBE(async, lvl, flg, ctx, nil, sel_getName(_cmd), frmt, ##__VA_ARGS__); } while(0)
#define HTTP_LOG_C_MAYBE(async, lvl, flg, ctx, frmt, ...) do{ if(HTTP_LOG_ASYNC_ENABLED) LOG_MAYBE(async, lvl, flg, ctx, nil, __FUNCTION__, frmt, ##__VA_ARGS__); } while(0)
#define HTTP_LOG_CONTEXT 80
#define HTTP_LOG_FLAG_ERROR   (1 << 0) // 0...00001
#define HTTP_LOG_FLAG_WARN    (1 << 1) // 0...00010
#define HTTP_LOG_FLAG_INFO    (1 << 2) // 0...00100
#define HTTP_LOG_FLAG_VERBOSE (1 << 3) // 0...01000
#define HTTP_LOG_LEVEL_OFF     0                                              // 0...00000
#define HTTP_LOG_LEVEL_ERROR   (HTTP_LOG_LEVEL_OFF   | HTTP_LOG_FLAG_ERROR)   // 0...00001
#define HTTP_LOG_LEVEL_WARN    (HTTP_LOG_LEVEL_ERROR | HTTP_LOG_FLAG_WARN)    // 0...00011
#define HTTP_LOG_LEVEL_INFO    (HTTP_LOG_LEVEL_WARN  | HTTP_LOG_FLAG_INFO)    // 0...00111
#define HTTP_LOG_LEVEL_VERBOSE (HTTP_LOG_LEVEL_INFO  | HTTP_LOG_FLAG_VERBOSE) // 0...01111
#define HTTP_LOG_FLAG_TRACE   (1 << 4) // 0...10000
#define HTTP_LOG_ERROR   (httpLogLevel & HTTP_LOG_FLAG_ERROR)
#define HTTP_LOG_WARN    (httpLogLevel & HTTP_LOG_FLAG_WARN)
#define HTTP_LOG_INFO    (httpLogLevel & HTTP_LOG_FLAG_INFO)
#define HTTP_LOG_VERBOSE (httpLogLevel & HTTP_LOG_FLAG_VERBOSE)
#define HTTP_LOG_TRACE   (httpLogLevel & HTTP_LOG_FLAG_TRACE)
#define HTTP_LOG_ASYNC_ENABLED   YES
#define HTTP_LOG_ASYNC_ERROR   ( NO && HTTP_LOG_ASYNC_ENABLED)
#define HTTP_LOG_ASYNC_WARN    (YES && HTTP_LOG_ASYNC_ENABLED)
#define HTTP_LOG_ASYNC_INFO    (YES && HTTP_LOG_ASYNC_ENABLED)
#define HTTP_LOG_ASYNC_VERBOSE (YES && HTTP_LOG_ASYNC_ENABLED)
#define HTTP_LOG_ASYNC_TRACE   (YES && HTTP_LOG_ASYNC_ENABLED)
#define HTTPLogError(frmt, ...)    HTTP_LOG_OBJC_MAYBE(HTTP_LOG_ASYNC_ERROR,   httpLogLevel, HTTP_LOG_FLAG_ERROR, HTTP_LOG_CONTEXT, frmt, ##__VA_ARGS__)
#define HTTPLogWarn(frmt, ...)     HTTP_LOG_OBJC_MAYBE(HTTP_LOG_ASYNC_WARN,    httpLogLevel, HTTP_LOG_FLAG_WARN, HTTP_LOG_CONTEXT, frmt, ##__VA_ARGS__)
#define HTTPLogInfo(frmt, ...)     HTTP_LOG_OBJC_MAYBE(HTTP_LOG_ASYNC_INFO,    httpLogLevel, HTTP_LOG_FLAG_INFO, HTTP_LOG_CONTEXT, frmt, ##__VA_ARGS__)
#define HTTPLogVerbose(frmt, ...)  HTTP_LOG_OBJC_MAYBE(HTTP_LOG_ASYNC_VERBOSE, httpLogLevel, HTTP_LOG_FLAG_VERBOSE, HTTP_LOG_CONTEXT, frmt, ##__VA_ARGS__)
#define HTTPLogTrace()             HTTP_LOG_OBJC_MAYBE(HTTP_LOG_ASYNC_TRACE,   httpLogLevel, HTTP_LOG_FLAG_TRACE, HTTP_LOG_CONTEXT, @"%@[%p]: %@", THIS_FILE, self, THIS_METHOD)
#define HTTPLogTrace2(frmt, ...)   HTTP_LOG_OBJC_MAYBE(HTTP_LOG_ASYNC_TRACE,   httpLogLevel, HTTP_LOG_FLAG_TRACE, HTTP_LOG_CONTEXT, frmt, ##__VA_ARGS__)
#define HTTPLogCError(frmt, ...)   HTTP_LOG_C_MAYBE(HTTP_LOG_ASYNC_ERROR,   httpLogLevel, HTTP_LOG_FLAG_ERROR, HTTP_LOG_CONTEXT, frmt, ##__VA_ARGS__)
#define HTTPLogCWarn(frmt, ...)    HTTP_LOG_C_MAYBE(HTTP_LOG_ASYNC_WARN,    httpLogLevel, HTTP_LOG_FLAG_WARN, HTTP_LOG_CONTEXT, frmt, ##__VA_ARGS__)
#define HTTPLogCInfo(frmt, ...)    HTTP_LOG_C_MAYBE(HTTP_LOG_ASYNC_INFO,    httpLogLevel, HTTP_LOG_FLAG_INFO, HTTP_LOG_CONTEXT, frmt, ##__VA_ARGS__)
#define HTTPLogCVerbose(frmt, ...) HTTP_LOG_C_MAYBE(HTTP_LOG_ASYNC_VERBOSE, httpLogLevel, HTTP_LOG_FLAG_VERBOSE, HTTP_LOG_CONTEXT, frmt, ##__VA_ARGS__)
#define HTTPLogCTrace()            HTTP_LOG_C_MAYBE(HTTP_LOG_ASYNC_TRACE,   httpLogLevel, HTTP_LOG_FLAG_TRACE, HTTP_LOG_CONTEXT, @"%@[%p]: %@", THIS_FILE, self, __FUNCTION__)
#define HTTPLogCTrace2(frmt, ...)  HTTP_LOG_C_MAYBE(HTTP_LOG_ASYNC_TRACE,   httpLogLevel, HTTP_LOG_FLAG_TRACE, HTTP_LOG_CONTEXT, frmt, ##__VA_ARGS__)