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CONFIG_OVERRIDE_FRAME_POINTER_DEFAULT¶
Override compiler defaults for -fomit-frame-pointer
Type: bool
Help¶
Omitting the frame pointer prevents the compiler from putting the stack frame pointer into a register. Saves a few instructions in function prologues/epilogues and frees up a register for general-purpose use, which can provide good performance improvements on register-constrained architectures like x86. On some architectures (including x86) omitting frame pointers impedes debugging as local variables are harder to locate. At -O1 and above gcc will enable -fomit-frame-pointer automatically but only if the architecture does not require if for effective debugging.
Choose Y if you want to override the default frame pointer behavior of your compiler, otherwise choose N.
Defaults¶
No defaults. Implicitly defaults to n.
Kconfig definition¶
At subsys/debug/Kconfig:168
Included via Kconfig:10 → Kconfig.zephyr:39 → subsys/Kconfig:14
Menu path: (top menu) → Debugging Options
config OVERRIDE_FRAME_POINTER_DEFAULT
bool
prompt "Override compiler defaults for -fomit-frame-pointer"
help
Omitting the frame pointer prevents the compiler from putting the stack
frame pointer into a register. Saves a few instructions in function
prologues/epilogues and frees up a register for general-purpose use,
which can provide good performance improvements on register-constrained
architectures like x86. On some architectures (including x86) omitting
frame pointers impedes debugging as local variables are harder to
locate. At -O1 and above gcc will enable -fomit-frame-pointer
automatically but only if the architecture does not require if for
effective debugging.
Choose Y if you want to override the default frame pointer behavior
of your compiler, otherwise choose N.
(Definitions include propagated dependencies, including from if’s and menus.)