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Re: Xcode is optimizing debug builds, screwing up the debugger
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Re: Xcode is optimizing debug builds, screwing up the debugger

  • Subject: Re: Xcode is optimizing debug builds, screwing up the debugger
  • From: Jeffrey Walton <email@hidden>
  • Date: Wed, 14 Aug 2013 13:52:55 -0400
Radar 12941954: Xcode 4 and iOS/Mac OS X Default Build Settings Improvements


On Wed, Aug 14, 2013 at 11:59 AM, Jens Alfke <email@hidden> wrote:

For quite a while I’ve been having frustrating problems with the Xcode debugger: breakpoints not being hit or stopping at the wrong line; inability to display variable values (“variable not available”), etc. But only in some projects — others work fine. I just assumed LLDB was intermittently flaky and didn’t investigate too much.

But today I ran into this again, and I dug into the target build settings and saw that the optimization level is “Fastest, smallest” (-Os). Oops, yeah, that’s going to mess up the debugger. :-P But that setting isn’t coming from the project — Xcode is defaulting to full optimization even for the Debug configuration. I changed the setting to No Optimization, and poof, the debugger problems went away.

This seems like a pretty glaring bug. And it’s apparently been around for a while, because I’ve had problems like this for a year at least. Anyone got a clue why it does this?
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 >Xcode is optimizing debug builds, screwing up the debugger (From: Jens Alfke <email@hidden>)

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