GNU linker ld usage question.

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Hi..

Currently I've been looking into the Makefile of bootloader "DAS
U-Boot".
At final build stage, gnu linker links all object and produce
the u-boot by the following Makefile target rule:

u-boot:        depend $(SUBDIRS) $(OBJS) $(LIBS) $(LDSCRIPT)
        UNDEF_SYM=`$(OBJDUMP) -x $(LIBS) | sed  -n -e
's/.*\(__u_boot_cmd_.*\)/-u/p'|sort|uniq`;\
        $(LD) $(LDFLAGS) $$UNDEF_SYM $(OBJS) \
            --start-group $(LIBS) $(PLATFORM_LIBS) --end-group \
            -Map u-boot.map -o u-boot

$(LDFLAGS) variable ends "-n" and UNDEF_SYM is undefined symbol name
list.
Can the undefined symbol names be the non-option argument of gnu ld?
According to manual page or info, I haven't found any mention of it.

Do I misunderstand at some point about usage of ld?
If anyone have a answer please let me know.

Thanks.

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