Hi,
We have recently switched from NXP PPC Compiler to a GCC compiler and have an issue with the Variables window when debugging. For some reason the visual representation of addresses for local variables in a function is wrong (i.e have the wrong offset from stack pointer) and therefore the values of the variables cannot be viewed properly. Everything else works as expected when debugging, and the actual code executes as expected, it's only the visual representation of local variables that is wrong.
We stepped into the assembly code to try to see what happens. Before we switched compiler, things look alright and the first instruction in a function which setup the local stack also modify the addresses in the Variables window to the correct offset. The addresses to the right in the picture below is correct and the ones used by the program when it executes.
When the program has been compiled with GCC the behavior changes. As seen in the picture below the addresses in the Variable window is correct before the first instruction is executed, and incorrect after the execution. The addresses becomes offset by the size of the local stack. Again, the program executes normally and the addresses seen to the left in the picture below are the ones used in the actual assembly code (stack pointer + offset).
How can this happen? Why are the local stack variables incorrect (or not setup) when entering a function in the first case and already setup correctly when entering a function in the second case? The function's first instruction then offsets the local variable addresses in the Variable window with the size of the local stack in both cases.
Global variables are displayed correctly in both cases, this issue only applies to local variables.
Debug symbols are included in the .elf-file in both cases, and as stated above everything else regarding debugging is working properly. Is there an NXP specific debug symbol or similar needed by CodeWarrior that might not be included when building with GCC, or what can cause this behaviour?
BR
/ Eric
