i get into this section:

For x86 machines, a bootstrap build of GCC uses the -fomit-frame-pointer compiler flag. Non-bootstrap builds
omit this flag by default, and the goal should be to produce a compiler that is exactly the same as if it were bootstrapped.
Apply the following sed command to force the build to use the flag:

case `uname -m` in
i?86) sed -i 's/^T_CFLAGS =$/& -fomit-frame-pointer/' gcc/Makefile.in ;;
esac"


i don't know if to apply this or no.
my host system is arch x64.
here they specify x86 and i use x64, but i want to be sure i *don't* need to use this command.
or maybe i should?
thanks

i also see that in the stable lfs (now it's 7.6. very new) they omitted this section.
so can i ignore this?

You can skip it.

thank you .