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# -----------------------------------------------------------------------------
#
# (c) 2010 The University of Glasgow
#
# This file is part of the GHC build system.
#
# To understand how the build system works and how to modify it, see
# http://hackage.haskell.org/trac/ghc/wiki/Building/Architecture
# http://hackage.haskell.org/trac/ghc/wiki/Building/Modifying
#
# -----------------------------------------------------------------------------
# A helpful little debug macro. Call it from a macro like this:
#
# $(call trace, this-macro($1,$2,$3))
#
# And invoke the build system with TRACE=1 to turn on tracing.
define trace
$$(if $(TRACE),$$(warning $1),)
endef
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