On 2014.04.15 at 13:19 +0200, Sam Ravnborg wrote: > > > > And while the code size reduction is less for MIPS than what others have > > reported for their platforms (I'm still investigating) is still is enough > > that embedded developers would commit murder for. > > I have experimented a little with a patch that links all of vmlinux in one step. > I compared the text size of vmlinux without and with -ffunction-sections. > > With a defconfig build on x86 (32 bit) I got following results: > > size difference > singlelink 10266506 > function-sections 9487369 779137 7,5% > > So this is a reduction of ~800 kb by enabling -ffunction-sections which > allows the linker to throw away unused sections. > > I have not boot tested the kernel so chances are that too much was thrown out by the linker. > But this is an option that has much smaller cost to use than lto. > And seems to benefit nicely in size. > > I have not tried this wihtout my singlelink patch - but I assume similar results. No, it wouldn't work, because you cannot mix -r and --gc-sections (or gold's --icf (identical code folding)). -- Markus -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
