Subject: [Boost-build] How to write a warn-once rule?
From: Matthew Chambers (matt.chambers42_at_[hidden])
Date: 2013-02-11 17:47:53
I'm trying to write a rule like:
rule warn-once ( once-flag ? : message )
if ! $(once-flag)
once-flag = true ;
echo $(message) ;
But it doesn't work because once-flag is passed by value. Is there a way to pass it by reference or
a different way to approach this while still getting a simple interface?
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