我的项目是 XCode 4.2。该项目编译为常规调试版本。
但是当我将构建类型更改为分析（我想分析内存使用情况）时，我从这个 Objective-C++ C++ 类中收到错误：
/Volumes/mchinen/scm/Voicer/FilterAudioMixer.mm:53：错误：杂散“@”
在程序 /Volumes/mchinen/scm/Voicer/FilterAudioMixer.mm 中： 在成员中
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
}' 在输入末尾
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，为什么呢？
为了完整起见，以下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 Objective-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/开发者/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图片/2011 /10 -iquotePictures/2011/11 -iquotePictures/2011/09 -iquotePictures/2011/07 -iquotePictures/2011/08 -iquotePictures/gui/rec -iquotePictures/gui/buttonentity -iquoteCocoaSoundCloudUI/Sources/CocoaAdditions -iquoteCocoaSoundCloudUI/Source s/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/DerivedData/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 -正常/armv7/FilterAudioMixer.o
该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，该编译器不支持@autoreleasepool。 （更多解释见这个答案 https://stackoverflow.com/questions/6381764/xcode-4-2-compiler-error.)
在您的方案中，检查“Profile”正在使用什么构建配置。然后，检查项目中的设置以及该构建配置的目标。
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