更新到 Xcode 6 后：架构的未定义符号 armv7："___gnu_f2h_ieee"

我一直试图找到这个问题几个小时没有结果。我已经更新到Xcode 6，并在ioS8.0 &7.1 since then:

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)

谢谢你的帮助。

EDIT(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

我也遇到过一个非常相似的问题，并且发现了这个。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

制作一个。c文件(名称不是问题，在我的情况下，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);
}

我无法解决这个问题，但我有一个部分的解决方案。
对于许多浮点函数来说，似乎没有armv7片。我认为它们将包含在Xcode 6的后续版本(或最终版本)中。

armv7s片是存在的:因为我在iPhone5上调试，它使用后一个指令集，我必须从构建设置中删除架构。

在Build Settings下，查找Architectures条目。
编辑，删除$(ARCHS_STANDARD)，替换为armv7s。
正如jcr所指出的，您可能必须将Active Architecture Only选项从YES切换到NO。

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