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opt: Silence unsed param warning triggered by -Wextra
authorJoel Stanley <joel@jms.id.au>
Mon, 7 Feb 2011 04:06:16 +0000 (14:36 +1030)
committerRusty Russell <rusty@rustcorp.com.au>
Mon, 7 Feb 2011 04:35:00 +0000 (15:05 +1030)
The type checking function does not use its parameter:

    ccan/opt/opt.h: In function ‘_check_is_entry’:
        ccan/opt/opt.h:328:53: warning: unused parameter ‘e’

Annotate the function using UNUSED from compiler.h.  This commit also
adds compiler.h as a dependency for opt.


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