更新到 Xcode 6 后：架构 armv7 的未定义符号：“___gnu_f2h_ieee”

After update to Xcode 6 : Undefined symbols for architecture armv7: "___gnu_f2h_ieee"

提问by jcr

I have been trying to find the problem for hours with no result. I have updated to Xcode 6 and get this error on both ioS8.0 & 7.1 since then :

我一直试图找到问题几个小时但没有结果。我已更新到 Xcode 6 并从那时起在 ioS8.0 和 7.1 上都出现此错误：

Undefined symbols for architecture armv7:
  "___gnu_f2h_ieee", referenced from:
      _playbackCallback in Audio.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Thanks for your help.

谢谢你的帮助。

EDIT (full build log error) :

编辑（完整构建日志错误）：

Ld /Users/rjc/Library/Developer/Xcode/DerivedData/Acc-hjhfomxkmwbyxwbfzjbduabbhlcc/Build/Products/Debug-iphoneos/Acc.app/Acc normal armv7
cd /Users/rjc/Desktop/apps/Acc
export IPHONEOS_DEPLOYMENT_TARGET=7.1
export PATH="/Applications/Xcode6-Beta2.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode6-Beta2.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode6-Beta2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch armv7 -isysroot /Applications/Xcode6-Beta2.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.0.sdk -L/Users/rjc/Library/Developer/Xcode/DerivedData/Acc-hjhfomxkmwbyxwbfzjbduabbhlcc/Build/Products/Debug-iphoneos -L/Users/rjc/Desktop/apps/Acc/Acc -F/Users/rjc/Library/Developer/Xcode/DerivedData/Acc-hjhfomxkmwbyxwbfzjbduabbhlcc/Build/Products/Debug-iphoneos -F/Users/rjc/Desktop/apps/Acc -filelist /Users/rjc/Library/Developer/Xcode/DerivedData/Acc-hjhfomxkmwbyxwbfzjbduabbhlcc/Build/Intermediates/Acc.build/Debug-iphoneos/Acc.build/Objects-normal/armv7/Acc.LinkFileList -dead_strip -ObjC -all_load -fobjc-arc -fobjc-link-runtime -miphoneos-version-min=7.1 -lCorePlot-CocoaTouch -framework CoreTelephony -framework MediaPlayer -framework MessageUI -framework Social -framework Accelerate -framework CoreLocation -framework MobileCoreServices -framework AVFoundation -framework AudioToolbox -framework CoreAudio -framework QuartzCore -framework UIKit -framework Foundation -framework CoreGraphics -framework CoreData -Xlinker -dependency_info -Xlinker /Users/rjc/Library/Developer/Xcode/DerivedData/Acc-hjhfomxkmwbyxwbfzjbduabbhlcc/Build/Intermediates/Acc.build/Debug-iphoneos/Acc.build/Objects-normal/armv7/Acc_dependency_info.dat -o /Users/rjc/Library/Developer/Xcode/DerivedData/Acc-hjhfomxkmwbyxwbfzjbduabbhlcc/Build/Products/Debug-iphoneos/Acc.app/Acc

回答by Charitha Basnayake

I also faced a very similar issue and found this. It was resolved the issue and was very helpful. http://helpdesk.metaio.com/questions/35905/undefined-symbols-for-architecture-i386-xcode-6-ios-8-beta-6/36538

我也遇到了一个非常相似的问题，并发现了这一点。它解决了这个问题，非常有帮助。 http://helpdesk.metaio.com/questions/35905/undefined-symbols-for-architecture-i386-xcode-6-ios-8-beta-6/36538

Make a .c file (name is not a concern, in my case i made i386Symbols.c) and add it to the project. Then paste this.

制作一个 .c 文件（名称不是问题，在我的例子中我制作了 i386Symbols.c）并将其添加到项目中。然后粘贴这个。

//  i386Symbols.c
//  Your project
//
//  Created by Ludwig on 10/2/14.
//  Copyright (c) 2014. All rights reserved.
//

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

FILE *fopen$UNIX2003( const char *filename, const char *mode )
{
    return fopen(filename, mode);
}

int fputs$UNIX2003(const char *res1, FILE *res2){
    return fputs(res1,res2);
}

int nanosleep$UNIX2003(int val){
    return usleep(val);
}

char* strerror$UNIX2003(int errornum){
    return strerror(errornum);
}

double strtod$UNIX2003(const char *nptr, char **endptr){
    return strtod(nptr, endptr);
}

size_t fwrite$UNIX2003( const void *a, size_t b, size_t c, FILE *d )
{
    return fwrite(a, b, c, d);
}

回答by Spak

I couldn't resolve the issue, but I have a partial workaround.
It seems that there is no armv7slice for many floating point functions. I assume that they will be included in a later release (or in the final release) of Xcode 6.

我无法解决该问题，但我有部分解决方法。许多浮点函数
似乎没有armv7切片。我假设它们将包含在 Xcode 6 的后续版本（或最终版本）中。

The armv7sslice is present instead: since I was debugging on an iPhone5, that uses this latter instruction set, I had just to remove the architecture from the build settings.

该armv7s切片存在，而不是：因为我上的iPhone5的调试，使用后者的指令集，我刚刚从构建设置中删除架构。

1. Go on your project settings, select your project.
2. Under Build Settings, look for the Architecturesentry.
3. Edit it, remove $(ARCHS_STANDARD)and replace it with armv7s.
4. As jcr noted, you may have to switch the Active Architecture Onlyoption from YESto NO.

1. 继续您的项目设置，选择您的项目。
2. 在Build Settings 下，查找Architectures条目。
3. 编辑它，删除$(ARCHS_STANDARD)并替换为armv7s.
4. 正如 jcr 所指出的，您可能需要将Active Architecture Only选项从切换YES到NO。

This will allow to build and run. Unfortunately I have no arm64device to test, but it might be possible that this slice is also included.

这将允许构建和运行。不幸的是，我没有arm64要测试的设备，但也可能包含此切片。