TargetConditionals使用
#import "TargetConditionals.h"gcc based compiler used on Mac OS X
for EX
#if !TARGET_IPHONE_SIMULATOR
Float32 preferredBufferSize = 0.0232;
if (checkError(AudioSessionSetProperty(kAudioSessionProperty_PreferredHardwareIOBufferDuration,
sizeof(preferredBufferSize),
&preferredBufferSize),
"Couldn't set the preferred buffer duration")) {
// just warning
}
#endif
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