Hard time debugging Local Variable in XCode

I'm having a hard-time debugging a local variable. I'm running gcc 4.2, XCode 3.2.4, base SDK Mac OS 10.5, and Objective-C++ in Debug-Mode.

Here's the issue. I'm working on trying to understand some code and it goes like this:

#define MAX4D 500

...

NSMutableArray *viewerPix[ MAX4D ];

When I hover over it during debug (pause on the line before and after) I get this

Unable to access variable "viewerPix"
Unable to access variable "viewerPix"
Unable to access variable "viewerPix"
...

repeated until I kill the application. What would cause this? I've tried setting it to a lower number... but to no avail. Even after I actually set the C-Array:

viewerPix[0] = [[NSMutableArray alloc] initWithCapacity:0];

I still get the same repe开发者_如何学Cated error message.

However, if I don't mouse-over the value (or debug) it "appears" to run fine, even doing stuff like:

[viewerPix[0] addObject: dcmPix];
if( [viewerPix[0] count] != [loadList count])...

but if I debug after those steps, it crashes just like before. Here are my build settings:

STRIPFLAGS =

ALTERNATE_GROUP = $(INSTALL_GROUP)

ALTERNATE_OWNER = $(INSTALL_OWNER)

ALTERNATE_MODE = $(INSTALL_MODE_FLAG)

ALTERNATE_PERMISSIONS_FILES =

DEPLOYMENT_LOCATION = NO

DEPLOYMENT_POSTPROCESSING = NO

INSTALL_GROUP = $(GROUP)

INSTALL_OWNER = $(USER)

INSTALL_MODE_FLAG = u+w,go-w,a+rX

DSTROOT = /tmp/$(PROJECT_NAME).dst

INSTALL_PATH = $(HOME)/Applications

SKIP_INSTALL = NO

COPY_PHASE_STRIP = NO

STRIP_INSTALLED_PRODUCT =

STRIP_STYLE = debugging

SEPARATE_STRIP = NO

GCC_FAST_OBJC_DISPATCH = YES

GCC_AUTO_VECTORIZATION = NO

GCC_OBJC_CALL_CXX_CDTORS = YES

GCC_ENABLE_SSE3_EXTENSIONS = NO

GCC_ENABLE_SSE41_EXTENSIONS = NO

GCC_ENABLE_SSE42_EXTENSIONS = NO

GCC_ENABLE_SUPPLEMENTAL_SSE3_INSTRUCTIONS = NO

GCC_STRICT_ALIASING = NO

GCC_FEEDBACK_DIRECTED_OPTIMIZATION = Off

GCC_ENABLE_FIX_AND_CONTINUE = NO

GCC_GENERATE_DEBUGGING_SYMBOLS = YES

GCC_DYNAMIC_NO_PIC = NO

GCC_GENERATE_TEST_COVERAGE_FILES = NO

GCC_INLINES_ARE_PRIVATE_EXTERN = YES

GCC_MODEL_TUNING = G5

GCC_INSTRUMENT_PROGRAM_FLOW_ARCS = NO

GCC_ENABLE_KERNEL_DEVELOPMENT = NO

GCC_DEBUGGING_SYMBOLS = default

GCC_REUSE_STRINGS = YES

GCC_NO_COMMON_BLOCKS = NO

GCC_ENABLE_OBJC_GC = unsupported

GCC_OPTIMIZATION_LEVEL = 0

GCC_FAST_MATH = NO

GCC_ENABLE_SYMBOL_SEPARATION = YES

GCC_THREADSAFE_STATICS = YES

GCC_SYMBOLS_PRIVATE_EXTERN = NO

GCC_UNROLL_LOOPS = NO

GCC_MODEL_PPC64 = NO

I don't know what else to say. Let me know what more information is needed, because I'm at a loss. There's also no 'build' tab when I get-info on the .mm file. Just General, Target, Comments (some helps I checked said to remove file-specific tags).

Should I initialize that c-array to nil? I can't just do.. array[500] = {nil}; right? that's C#?

I was using LLVM and Clang 1.5, but I switched to GCC 4.2 since I wasn't getting any local symbols. Am I missing something??

If the optimizer is on, that can effectively eliminate local variables.

However, why a C array of mutable ObjC arrays? That seems odd.

check Product->Scheme->Edit Scheme->Run xxx, Build Configuration is Debug, if that is Release happened you see.