在此范围错误中未声明自动释放池

Question

我的项目在 XCode 4.2 中。该项目编译为常规调试版本。

但是当我将构建类型更改为配置文件（我想分析内存使用情况）时，我从这个objective-c++ c++ 类中得到了错误：

/Volumes/mchinen/scm/Voicer/FilterAudioMixer.mm:53: 错误: 流浪'@' 在程序/Volumes/mchinen/scm/Voicer/FilterAudioMixer.mm：在成员 函数'void FilterAudioMixer::WriteToBuffer(SInt16*, int)': /Volumes/mchinen/scm/Voicer/FilterAudioMixer.mm:53：错误： 'autoreleasepool' 未在此范围内声明 /Volumes/mchinen/scm/Voicer/FilterAudioMixer.mm:53：错误：预期 ;' before '{' token /Volumes/mchinen/scm/Voicer/FilterAudioMixer.mm:147: error: expected }' 在输入结束时

下面的@autoreleasepool 行是第 53 行：

void FilterAudioMixer::WriteToBuffer(SInt16* buffer, int nb_samps)
{
   @autoreleasepool {
      //do a per element lock (todo)
      pthread_mutex_lock(&playlist_lock);
      FilterSound *snd;

      size_t count = playlist.size();
      for (size_t i = 0; i < count; i++) {
         snd = playlist[i];
         [snd writeToBuffer:buffer samples:nb_samps];
      }
      pthread_mutex_unlock(&playlist_lock);

      if (m_mute) {
         memset(buffer, 0, sizeof(SInt16) * 2 * nb_samps);
      }
   }
}

@autoreleasepool 似乎只在配置文件下给我带来问题，这是为什么呢？

为了完整起见，这里是构建结果窗口中的编译行：

编译C /Users/mchinen/Library/Developer/Xcode/DerivedData/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Intermediates/Voicer.build/Release-iphoneos/Voicer.build/Objects-normal/armv7/FilterAudioMixer.o FilterAudioMixer.mm 正常 armv7 目标-c++ com.apple.compilers.llvmgcc42 cd /Volumes/mchinen/scm/Voicer setenv LANG en_US.US-ASCII setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/ usr/sbin:/sbin" /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-gcc-4.2 -x objective-c++ -arch armv7 -fmessage-length=0 -pipe -Wno-trigraphs -fpascal-strings -Os -Wreturn-type -Wunused-variable -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS .platform/Developer/SDKs/iPhoneOS5.0.sdk -gdwarf-2 -fvisibility=hidden -fvisibility-inlines-hidden -mthumb -miphoneos-version-min=4.0 -iquote /Users/mchinen/Library/Developer/Xcode/DerivedData/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Intermediates/Voicer.build /Release-iphoneos/Voicer.build/Voicer-generated-files.hmap -I/Users/mchinen/Library/Developer/Xcode/DerivedData/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Intermediates/Voicer.build/Release-iphoneos/Voicer.build/Voicer-own-target-headers.hmap -I/Users/mchinen/Library/Developer/Xcode/DerivedData/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Intermediates/Voicer.build/Release-iphoneos/Voicer.build/Voicer-all-target-headers.hmap -iquote /Users/mchinen/Library/Developer/Xcode/DerivedData/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Intermediates/Voicer.build/Release-iphoneos/Voicer.build/Voicer-project-headers.hmap -我引用。 -iquotePictures -iquoteCocoaSoundCloudUI -iquoteCocoaSoundCloudAPI -iquoteOHAttributedLabel -iquoteOAuth2Client -iquoteVoicer.xcworkspace -iquoteClasses -iquotehelp -iquoteJSONKit -iquoteShaders -iquoteaudio -iquotePictures / extremeprogrammingpics -iquotePictures / 2010 -iquotePictures /网络摄像头-iquotePictures / 2011 -iquotePictures / GUI -iquoteCocoaSoundCloudUI / SoundCloud.bundle -iquoteCocoaSoundCloudUI/Sources -iquoteCocoaSoundCloudAPI/Sources "-iquoteOHAttributedLabel/AttributedLabel 示例" -iquoteOHAttributedLabel/OHAttributedLabel -iquoteOAuth2Client/Sources -iquoteVoicer.xcworkspace/xcuserdata -iquoteJSONKit/JSONKit -iquoteaudio/CAExtras -iquotePictures/2010/06 -iquotePictures/2010/07 -iquotePictures/2010/08 -iquotePictures/2011/12 -iquote /10 -iquotePictures/2011/11 -iquotePictures/2011/09 -iquotePictures/2011/07 -iquotePictures/2011/08 -iquotePictures/gui/rec -iquotePictures/gui/buttonentity -iquoteCocoaSoundCloudUI/Sources/CocoaAdditions -iquoteCocoaSoundCloudUI/Sources/SoundCloudUI -iquoteCocoaSoundCloudAPI/Sources/SoundCloudAPI “-iquoteOHAttributedLabel/AttributedLabel 示例/类” -iquoteOAuth2Client/Sources/OAuth2Client -iquoteVoicer.xcworkspace/xcuserdata/mchinen.xcuserdatad -iquotePictures/2010/06/25 -iquotePictures/2010/07/22 -iquotePictures/2010/07/18 -iquotePictures/2010/08/25 -iquotePictures /2010/08/29 -iquotePictures/2010/08/07 -iquotePictures/2010/08/03 -iquotePictures/2011/12/16 -iquotePictures/2011/12/14 -iquotePictures/2011/12/17 -iquotePictures/2011 /12/15 -iquotePictures/2011/10/26 -iquotePictures/2011/10/30 -iquotePictures/2011/10/21 -iquotePictures/2011/10/22 -iquotePictures/2011/10/13 -iquotePictures/2011/11 /18 -iquotePictures/2011/11/19 -iquotePictures/2011/09/26 -iquotePictures/2011/09/25 -iquotePictures/2011/09/01 -iquotePictures/2011/09/21 -iquotePictures/2011/09/07 -iquotePictures/2011/09/13 -iquotePictures/2011/09/19 -iquotePictures/2011/07/17 -iquotePictures/2011/08/30 -iquotePictures/2011/08/23 -iquotePictures/2011/08/29 -iquoteVoicer .xcworkspace/xcuserdata/mchinen.xcuserdatad/xcdebugger -I/Users/mchinen/Library/Developer/Xcode/DerivedDat a/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Products/Release-iphoneos/include -I/Users/mchinen/Library/Developer/Xcode/DerivedData/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Intermediates/Voicer.build/Release-iphoneos/Voicer.build/DerivedSources/armv7 -I/Users/mchinen/Library/Developer/Xcode/DerivedData/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Intermediates/Voicer.build/Release-iphoneos/Voicer.build/DerivedSources -F/Users/mchinen/Library/Developer/Xcode/DerivedData/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Products/Release-iphoneos -DNS_BLOCK_ASSERTIONS=1 -include /Users/mchinen/Library/Developer/Xcode/DerivedData/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Intermediates/PrecompiledHeaders/Filter_Prefix-hbhtwvzcunnlquaijtkwxcnrmocg/Filter_Prefix.pch -c /Volumes/mchinen/scm/Voicer/FilterAudioMixer.mm -o /Users/mchinen/Library/Developer/Xcode/DerivedData/Voicer-aebonlzraugcbqarecvubzkhxlfr/Build/Intermediates/Voicer.build/Release-iphoneos/Voicer.build/Objects -normal/armv7/FilterAudioMixer.o

Answer 1

构建日志的重要部分是：

gcc-4.2

您的构建设置中的某些内容导致您使用旧的 GCC 4.2 编译器，它不支持 @autoreleasepool。 （更多解释见this answer。）

在您的方案中，检查“配置文件”正在使用什么构建配置。然后，检查项目中的设置和该构建配置的目标。