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GDB 7.7.1 with llvm-gcc 5.1 on Mac [message #1403654]

Thu, 24 July 2014 22:10

Doug Gaff

Messages: 1
Registered: July 2014

Junior Member

As you know, OS X Mavericks doesn't include GDB or GCC. I've installed GDB with homebrew and signed it as described here:

ntraft.com/installing-gdb-on-os-x-mavericks/

Building a simple HelloWorld.c app from a makefile using XCode's llvm-gcc works fine, but trying to debug it with GDB 7.7.1 is flaky.

In CDT, sometimes it correctly stops on main, but then it flakes out while stepping. Trying it from the command line produces similar results. Doing an attach on the process and trying to set a breakpoint returns this:

Attaching to process 29997
Reading symbols from /Users/dgaff/Documents/Code/ss.com/svn/video/doug/doug...Reading symbols from /Users/dgaff/Documents/Code/ss.com/svn/video/doug/doug.dSYM/Contents/Resources/DWARF/doug...done.
done.
0x000000010f96af4e in ?? ()
(gdb) break myfunc
Cannot access memory at address 0x100000f40

It looks like a symbol issue. Here's the build command:

gcc -g3 -gdwarf-2 doug.c -o doug

Running Xcode's lldb from the command line to debug it works fine.

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Re: GDB 7.7.1 with llvm-gcc 5.1 on Mac [message #1403902 is a reply to message #1403654]

Mon, 28 July 2014 14:08

Doug Schaefer

Messages: 135
Registered: July 2009

Senior Member

Hey Doug, that usually points to gdb loading the wrong or bad symbols, i.e. has the wrong address info for myfunc. I wonder about the -gdwarf-2 entry. You might want to just let it use the default.

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Re: GDB 7.7.1 with llvm-gcc 5.1 on Mac [message #1403957 is a reply to message #1403902]

Mon, 28 July 2014 17:40

Marc Khouzam

Messages: 357
Registered: July 2009

Senior Member

Sometimes the message "Cannot access memory at address..." is due to the fact that the process is currently running.
Before trying to set a breakpoint, try typing
interrupt
and then see if you can set a breakpoint.

I'm not sure what is happening when CDT does it, as the traces above seem to be from a manual command.

Marc

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