assigning symbol size via linker script

[Mike Frysinger]

this is a pretty basic question i imagine, but i cant seem to find the answer 
in the binutils ld docs:
http://sourceware.org/binutils/docs-2.17/ld/index.html

i'd like to use a linker script to create a symbol and set the size of it ... 
so the pseudo linker script being like:
.text : {
	...
	my_label = .;
	custom.o (.text)
	my_label.size = . - my_label;
	...
}

currently i'm doing:
	my_label_start = .;
	custom.o (.text)
	my_label_end = .;
and then looking up both symbols and doing a diff on their addresses to find 
the size of the section in between
-mike
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