On Wednesday 05 September 2007 21:46, Sam Ravnborg wrote: > On Wed, Sep 05, 2007 at 07:40:15PM +0100, Denys Vlasenko wrote: > > On Wednesday 05 September 2007 14:55, Denys Vlasenko wrote: > > > Part 3: > > > > > > Makefile: > > > init/Kconfig: > > > add config DISCARD_UNUSED_SECTIONS with appropriate > > > big scary warning. It enables gcc and ld options > > > for section garbage collection. > > > > At it typically happens, last-minute "obviously correct" change was a > > mistake. > > > > This doesn't work as intended: > > > > LDFLAGS_vmlinux += $(call ld-option, --gc-sections) > > > > With the above line, --gc-sections doesn't get added, > > and vmlinux is not garbage collected.
> Did you find out why it does not work? ld-option is designed to test whether -Wl,-Wsomething will work on gcc commandline. I am adding --gc-sections to ld commandline. > > > > It must be > > > > LDFLAGS_vmlinux += --gc-sections > Doing a normal kernel build will link vmlinux three or four times. > If we introduce --gc-sections we should add a preparational link of > vmlinux where we use --gc-sections and skip it for the rest of the links > assuming that --gc-sections takes some time for ld to do. Yes, this will speed up things a bit. However, for me build time is totally dominated by CC stages, not LD. I don't have 32 core CPU yet :( -- vda - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
