Kernel compile fail with CFLAGS

Question

Well something really strange is happening when i try to complile my 2.6 kernel with these flags
make CFLAGS="-march=pentium3 -O3 -pipe -fomit-frame-pointer" CXXFLAGS="-march=pentium3 -O3 -pipe -fomit-frame-pointer"
In file included from include/linux/kernel_stat.h:5,
from init/main.c:33:
include/asm/irq.h:16:25: irq_vectors.h: No such file or directory
In file included from init/main.c:33:
include/linux/kernel_stat.h:28: error: `NR_IRQS' undeclared here (not in a function)
make[1]: *** [init/main.o] Error 1
make: *** [init] Error 2
i really dont understand why i am getting this error.I believe that i must include some features to my kernel config since i am trying to   get the best out of it.Any help?

Answer 1

Simply don't do hardcore optimalization for your kernel, it is already optimized by hand where needed, so it shouldn't make that much difference. Don't do much else than -march=cputype, and best you can do is compiling it with a newer GCC version. It's better to keep it small by choosing only the features you need than to make it unstable or break it with extreme optimalizations that only work counter-productive like -O3. If you want something big and important to attack, then take a look at glibc...