Unused classes gets compiled into swf

i building swc [my.swc] component compc. suppose contain base functionality my.swf

 

i need include (third party) swc [other.swc] own swc. other swc has reference mx.core.mx_internal , suspect reference in end, when compile my.swf, results in mx classes (mx.*) , spark classes (spark.*) included in my.swf (seen when decompiling)

 

the difference in size between my.swf with/without other.swc ~180kb.

the difference (when decompiling) my.swc with/without other.swc first has reference mx.core.mx_internal

 

here compc part ant task:

<compc output="my.swc">

<include-sources dir="${project.root}/${src_root}" includes="*" />

<library-path dir="${project.root}/${libs_dir}" includes="*" />

</compc>

 

do know if there problem compiling swc swc?

any other ideas why mx , spark classes included?

 

thanks!

should add if build swf directly other.swc (and use same classes in my.swc) result smaller file. problem doesn't seem in other.swc

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