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TMS570LC4357: Ethernet LWIP stack integration

Part Number: TMS570LC4357

In lwip Ethernet example from this page"processors.wiki.ti.com/.../HALCoGen_Ethernet_Driver_and_lwIP_Integration_Demonstration " I found that some of the files in LWIP stack has been excluded from build, but the excluded files contains the interface file too. While debugging i found that the program while running is going to the excluded files also. If those excluded files are included they will throw lot of errors. Deleting those exclude files will also won't work. 

so what does excluding a file from build actually means?

kindly give responses.

warm regards

anandhu ramesh