[flexcoders] File Size is not same when compiled through mxmlc and flex builder

[ilikeflex]

Hi
I think that the file Size is not same when compiled through mxmlc 
and flex builder.

I have the following option in my flex builder project references

Flex Build Path
  Library Path
     Framework Linkage: Merged into Code
        Default Settings for framework files
        /sowLibrary/lib
        /sowLibrary/bin


There are different swc files in the folder /sowLibrary/bin 
and /sowLibrary/lib.

Now if i want to compile the project through ant script

<target name="compileSow">
        <mxmlc file="${src}\Sow.mxml" failonerror="true" 
output="${sow.output}" fork="true">
        <compiler.include-libraries dir="${sowLibrary.lib}" 
append="true">
                <include name="ria_msflexlib_flex3.swc"/>
                <include name="Cairngorm.swc"/>
        </compiler.include-libraries>

        <compiler.include-libraries dir="${sowLibrary.bin}" 
append="true">
                <include name="sowLibrary.swc"/>
        </compiler.include-libraries>
        </mxmlc>
</target>

The file size is not same in the above two methods.The ant script 
file compiles with more file size. I know flex builder also uses 
mxmlc to compile the files but how can i see the parameters passed to 
mxmlc through flex builder.

Any pointers are highly appreciated.

Thanks
ilikeflex