For x86, the option is -momit-leaf-frame-pointer, not -fomit-leaf-frame-pointer.
gcc/ChangeLog:
* doc/invoke.texi (x86 Options): Fix '-momit-leaf-frame-pointer' typo.
Don't keep the frame pointer in a register for leaf functions. This
avoids the instructions to save, set up, and restore frame pointers and
makes an extra register available in leaf functions. The option
-@option{-fomit-leaf-frame-pointer} removes the frame pointer for leaf functions,
+@option{-momit-leaf-frame-pointer} removes the frame pointer for leaf functions,
which might make debugging harder.
@opindex mtls-direct-seg-refs