What does this do: $(@:_config=)

[joemama]

Hi:

Have a makefile and wondering what this does?


atngw100_config: unconfig
    @./mkconfig $(@:_config=) avr32 at32ap atngw100 atmel at32ap7000

Specifically interested in this part: $(@:_config=)     

I know that the mkconfig program receives the following arguments:
  atngw100 avr32 at32ap atngw100 atmel at32ap7000

Just not sure how the makefile construct creates the first atngw100 string

Thanks!
 
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