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问题描述
对于我在Mac上的任何应用程序,有没有办法告诉它是否已经启用GC编译,或者是否正在进行手动内存管理?
For any application that I have on my Mac, is there a way to tell if it was compiled with GC enabled, or if it's doing manual memory management?
推荐答案
我发现了答案。请注意,原始讯息是,但包含发表评论,这是一位苹果工程师,指明了方向。
I found the answer here. Mind you that the original post is wrong, but contains a comment by Mark Rowe, an Apple engineer, that points the way.
我已经重新运行它在当前操作系统(10.6.4)的机器上提到的 otool
命令。以下是输出:
I have re-run the otool
commands he mentions on my machine with the current OS (10.6.4). Here's the output:
$ uname -a
Darwin meaningless.local 10.4.0 Darwin Kernel Version 10.4.0: Fri Apr 23 18:28:53 PDT 2010; root:xnu-1504.7.4~1/RELEASE_I386 i386
### Mail doesn't use GC
$ otool -oV /Applications/Mail.app/Contents/MacOS/Mail | tail -3
Contents of (__DATA,__objc_imageinfo) section
version 0
flags 0x0
### Xcode supports GC and retain/release
$ otool -oV /Developer/Applications/Xcode.app/Contents/MacOS/Xcode | tail -3
Contents of (__DATA,__objc_imageinfo) section
version 0
flags 0x2 OBJC_IMAGE_SUPPORTS_GC
:
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