Add -funwind-tables
when cross-compiling, you can successfully unwind backtrace through the interface(_Unwind_Backtrace and _Unwind_VRS_Get
) in the libgcc library.
But when I added the -O2 option at cross-compiling time, unwind backtrace would fail. I pass -Q -O2 --help=optimizers
print out the optimization and testing, but the results and -O2 is different, very strange,
Adding the -O2 option when cross-compiling causes the unwind backtrace to fail
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You haven't told us which ARM architecture you are building for - but assuming it's a 32-bit architecture, enabling
-O2
has also enabled-fomit-frame-pointer
(§-fomit-frame-pointer
)The frame-pointer
The frame pointer contains the base of the current function's stack frame (and with the knowledge that the caller's frame pointer is stored on the stack, a linked list of all stack frames in the call-tree). It's usually described as
fp
in documentation - a synonym forr11
.Omitting the frame-pointer
The ARM register file is small at 16 registers - one of which is the program counter. The frame pointer is one of the 15 that remains and is used only for debugging and diagnostics - specifically to provide stack walk-backs and symbolic debugging.
-fomit-frame-pointer
tells the compiler to not maintain a frame pointer, thus liberating ther11
for other uses, and potentially avoiding spill of variables to the stack from registers. It also saves 4 bytes per stack-frame of stack storage and a store and load to the stack.Naturally, if
fp
is used as general purpose register, its contents are undefined and walk-backs won't work.You probably want to reenable the frame pointer with
-fno-omit-frame-pointer
for your own sanity.