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Re: Very basic question
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Re: Very basic question


  • Subject: Re: Very basic question
  • From: Jason Breckenridge <email@hidden>
  • Date: Fri, 14 May 2010 18:16:44 +0100


Yes, I am able to debug normally.  It stops at breakpoints as desired,I can view the values of variables, step into and out of functions, etc., but at each step GDB prints the message

Cannot access memory at address 0x0

as I previously mentioned.  This message is printed whether I step in Xcode, or from the GDB console.

This is not a show-stopper, but I'm really puzzled as to the cause.

Thanks for your help,

Jason

On 13 May 2010, at 22:59, Xochitl Lunde wrote:


Are you meaning that you are able to debug normally, but for some reason you get a message every time you step?  Or do you mean that you cannot debug and when you try to step you get this message?  Are you using Xcode to build your project or are you building it on the command line using autotools, make, or something similar?

Are you sure you're debugging the 'Debug' build configuration and you aren't stripping your program?  Xcode will let you "debug" a Release build of a project, but the result for me is that I can't really debug anything because the release is stripped.   Have you messed with the "Load Symbols Lazily" setting in the Debugging section of Xcode preferences?  In my project I need to have that checked to be able to debug successfully, but the usual symptom is that the program won't stop on breakpoints.

You can see all breakpoints by clicking "Show Breakpoints" in the debugger window that opens with Command+Shift+Y.  You might have to make the window larger to see the "Show Breakpoints" button to the right of the "Step Out" button on the top toolbar.

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References: 
 >Re: Very basic question (From: Xochitl Lunde <email@hidden>)

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