CODEWITHSUNDEEP
objective-carraysxcodemacosgcc
Stephen Furlani
Stephen Furlani

Reputation: 6856

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 repeated 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??

Upvotes: 1

Views: 1002

Answers (2)

user2684889
user2684889

Reputation: 1

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

Upvotes: 0

bbum
bbum

Reputation: 162722

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

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

Upvotes: 1

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