Documentation for waf options

[Hal Murray]

>> How am I supposed to figure out that the format is
>>   --build-epoch=$date
>> rather than
>>   --build-epoch $date
> Both forms work.

Thanks.

> Do we suggest that only 1 form works somewhere?

./waf configure --help shows the = version

I don't know of any place that says anything about which form does/doesn't 
work.

What should our documentation say or examples use?


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