在更新到Xcode9之后,我得到C需要所有声明的类型说明符

概述我有一个用Objective c编码的项目,它使用Apple提供的SimplePing.h. 代码运行完美,直到我将Xcode更新为v9.0;它不再编译,因为Apple在SimplePing.h提供的文件SimplePing.h中存在错误 C++ requires a type specifier for all declarations 在SimplePing.h中的每一行上生成错误 check 我有一个用Objective c编码的项目,它使用Apple提供的SimplePing.h.

代码运行完美,直到我将Xcode更新为v9.0;它不再编译,因为Apple在SimplePing.h提供的文件SimplePing.h中存在错误

C++ requires a type specifIEr for all declarations

在SimplePing.h中的每一行上生成错误

check_compile_time(sizeof(IPheader) == 20);check_compile_time(offsetof(IPheader,versionAndheaderLength) == 0);check_compile_time(offsetof(IPheader,differentiatedServices) == 1);check_compile_time(offsetof(IPheader,totalLength) == 2);check_compile_time(offsetof(IPheader,IDentification) == 4);check_compile_time(offsetof(IPheader,flagsAndFragmentOffset) == 6);check_compile_time(offsetof(IPheader,timetolive) == 8);check_compile_time(offsetof(IPheader,protocol) == 9);check_compile_time(offsetof(IPheader,headerChecksum) == 10);check_compile_time(offsetof(IPheader,sourceAddress) == 12);check_compile_time(offsetof(IPheader,destinationAddress) == 16);

SimplePing.h类包括以下类

#include <AssertMacros.h>           // for __Check_Compile_Time

其中check_compile_time的代码定义如下：

#ifndef __Check_Compile_Time    #ifdef __GNUC__         #define __Check_Compile_Time( expr )    \            extern int compile_time_assert_Failed[ ( expr ) ? 1 : -1 ] __attribute__( ( unused ) )    #else        #define __Check_Compile_Time( expr )    \            extern int compile_time_assert_Failed[ ( expr ) ? 1 : -1 ]    #endif#endif

第一个问题：我该如何解决这个问题？
第二个问题：我似乎无法修改AssertMacros.h文件,它被锁定..我应该解锁并修复它吗？或者我还能做些什么来解决这个问题？

解决方法 感谢StoryTeller的敏锐评论,我刚才注意到,Apple在模块AssertMacros.h中将__check_compile_time的名称修改为__Check_Compile_Time
要解决此问题,请使用__Check_Compile_Time更新check_compile_time的所有实例

所以Apple的SimplePing.h类的更新代码应如下：

#import <Foundation/Foundation.h>#if TARGET_OS_EMbedDED || TARGET_IPHONE_SIMulATOR    #import <CFNetwork/CFNetwork.h>#else    #import <CoreServices/CoreServices.h>#endif#include <AssertMacros.h>#pragma mark * SimplePing// The SimplePing class is a very simple class that lets you send and receive Pings.@protocol SimplePingDelegate;@interface SimplePing : NSObject{    Nsstring *              _hostname;    NSData *                _hostAddress;    CFHostRef               _host;    CFSocketRef             _socket;    ID<SimplePingDelegate>  _delegate;    uint16_t                _IDentifIEr;                            // host byte order    uint16_t                _nextSequenceNumber;                    // host byte order}+ (SimplePing *)simplePingWithHostname:(Nsstring *)hostname;        // chooses first IPv4 address+ (SimplePing *)simplePingWithHostAddress:(NSData *)hostAddress;    // contains (struct sockaddr)@property (nonatomic,assign,reaDWrite) ID<SimplePingDelegate> delegate;@property (nonatomic,copy,Readonly)  Nsstring *             hostname;@property (nonatomic,Readonly)  NSData *               hostAddress;@property (nonatomic,Readonly)  uint16_t               IDentifIEr;@property (nonatomic,Readonly)  uint16_t               nextSequenceNumber;- (voID)start;    // Starts the Pinger object Pinging.  You should call this after     // you've setup the delegate and any Ping parameters.- (voID)sendPingWithData:(NSData *)data;    // Sends an actual Ping.  Pass nil for data to use a standard 56 byte payload (resulting in a     // standard 64 byte Ping).  Otherwise pass a non-nil value and it will be appended to the     // ICMP header.    //    // Do not try to send a Ping before you receive the -simplePing:dIDStartWithAddress: delegate     // callback.- (voID)stop;    // Stops the Pinger object.  You should call this when you're done     // Pinging.+ (const struct ICMPheader *)icmpInPacket:(NSData *)packet;    // Given a valID IP packet contains an ICMP,returns the address of the ICMP header that     // follows the IP header.  This doesn't do any significant valIDation of the packet.@end@protocol SimplePingDelegate <NSObject>@optional- (voID)simplePing:(SimplePing *)Pinger dIDStartWithAddress:(NSData *)address;    // Called after the SimplePing has successfully started up.  After this callback,you     // can start sending Pings via -sendPingWithData:- (voID)simplePing:(SimplePing *)Pinger dIDFailWithError:(NSError *)error;    // If this is called,the SimplePing object has Failed.  By the time this callback is     // called,the object has stopped (that is,you don't need to call -stop yourself).// important: On the send sIDe the packet does not include an IP header. // On the receive sIDe,it does.  In that case,use +[SimplePing icmpInPacket:] // to find the ICMP header within the packet.- (voID)simplePing:(SimplePing *)Pinger dIDSendPacket:(NSData *)packet;    // Called whenever the SimplePing object has successfully sent a Ping packet. - (voID)simplePing:(SimplePing *)Pinger dIDFailToSendPacket:(NSData *)packet error:(NSError *)error;    // Called whenever the SimplePing object trIEs and fails to send a Ping packet.- (voID)simplePing:(SimplePing *)Pinger dIDReceivePingResponsePacket:(NSData *)packet;    // Called whenever the SimplePing object receives an ICMP packet that looks like     // a response to one of our Pings (that is,has a valID ICMP checksum,has     // an IDentifIEr that matches our IDentifIEr,and has a sequence number in     // the range of sequence numbers that we've sent out).- (voID)simplePing:(SimplePing *)Pinger dIDReceiveUnexpectedPacket:(NSData *)packet;    // Called whenever the SimplePing object receives an ICMP packet that does not     // look like a response to one of our Pings.@end#pragma mark * IP and ICMP On-The-Wire Format// The following declarations specify the structure of Ping packets on the wire.// IP header structure:struct IPheader {    uint8_t     versionAndheaderLength;    uint8_t     differentiatedServices;    uint16_t    totalLength;    uint16_t    IDentification;    uint16_t    flagsAndFragmentOffset;    uint8_t     timetolive;    uint8_t     protocol;    uint16_t    headerChecksum;    uint8_t     sourceAddress[4];    uint8_t     destinationAddress[4];    // options...    // data...};typedef struct IPheader IPheader;__Check_Compile_Time(sizeof(IPheader) == 20);__Check_Compile_Time(offsetof(IPheader,versionAndheaderLength) == 0);__Check_Compile_Time(offsetof(IPheader,differentiatedServices) == 1);__Check_Compile_Time(offsetof(IPheader,totalLength) == 2);__Check_Compile_Time(offsetof(IPheader,IDentification) == 4);__Check_Compile_Time(offsetof(IPheader,flagsAndFragmentOffset) == 6);__Check_Compile_Time(offsetof(IPheader,timetolive) == 8);__Check_Compile_Time(offsetof(IPheader,protocol) == 9);__Check_Compile_Time(offsetof(IPheader,headerChecksum) == 10);__Check_Compile_Time(offsetof(IPheader,sourceAddress) == 12);__Check_Compile_Time(offsetof(IPheader,destinationAddress) == 16);// ICMP type and code combinations:enum {    kICMPTypeEchoReply   = 0,// code is always 0    kICMPTypeEchoRequest = 8            // code is always 0};// ICMP header structure:struct ICMPheader {    uint8_t     type;    uint8_t     code;    uint16_t    checksum;    uint16_t    IDentifIEr;    uint16_t    sequenceNumber;    // data...};typedef struct ICMPheader ICMPheader;__Check_Compile_Time(sizeof(ICMPheader) == 8);__Check_Compile_Time(offsetof(ICMPheader,type) == 0);__Check_Compile_Time(offsetof(ICMPheader,code) == 1);__Check_Compile_Time(offsetof(ICMPheader,checksum) == 2);__Check_Compile_Time(offsetof(ICMPheader,IDentifIEr) == 4);__Check_Compile_Time(offsetof(ICMPheader,sequenceNumber) == 6);

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