Question

I have a project for Mac OS X 10.5 that I’m building on 10.6 using Xcode 3.2. When I use GCC 4.2 for Debug build and hit a breakpoint, Xcode debugger displays local variable information normally. If I choose LLVM GCC 4.2 or Clang LLVM, when I hit breakpoint, local symbols are not available, and GDB says No symbol ‘self’ in current context if I try to print self or any other local symbol. In all cases Generate debug info option is set. The Debug configuration is set to $(NATIVE_ARCH) and 10.5 SDK, Build active architecture only option is set. When GDB starts, I can see it is being configured as x86_64-apple-darwin. I must be missing something obvious. How do I make GDB show local symbols when using a LLVM compiler?

Answer 1

For those not familiar, a little more detail to cdespinosa’s answer, which worked for me, and which I voted up.

1. From the Xcode menu, select Project > Edit Project Settings…
2. Choose the Build tab
3. In the search box type “Optimization Level”, choose that field, and select None.
4. Next search for “Debug Information Format”, choose that field, and select “DWARF” or “DWARF with dSYM”.

Would have put this in comments to his post if I had the privs. 😉

This cost me some serious time, and was frankly kind of sloppy on Apple’s part, but in general I can’t complain.