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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
#
# -----------------------------------------------------------------------------
# For each line in $(TOP)/packages:
# libraries/foo tag ...
# this calls
# $(call $1,foo,tag)
#
# Except! If there's a libraries/foo/ghc-packages then it calls
# $(call $1,foo/bar,tag)
# for each word 'bar' in libraries/foo/ghc-packages.
#
# We use an FEL_ prefix for the variable names, to avoid trampling on
# other variables, as make has no concept of local variables.
# We need to handle bin-package-db specially, as it doesn't have an
# entry in the packages file, as it isn't in its own repository.
define foreachLibrary
# $1 = function to call for each library
# We will give it the package path and the tag as arguments
$$(foreach hashline,libraries/bin-package-db#-#no-remote-repo#no-vcs \
$$(shell grep '^libraries/' packages | sed 's/ */#/g'),\
$$(eval FEL_line := $$(subst #,$$(space),$$(hashline))) \
$$(eval FEL_libdir := $$(word 1,$$(FEL_line))) \
$$(eval FEL_tag := $$(word 2,$$(FEL_line))) \
$$(eval FEL_libroot := $$(patsubst libraries/%,%,$$(FEL_libdir))) \
$$(if $$(wildcard $$(FEL_libdir)/ghc-packages), \
$$(foreach lib,$$(shell cat $$(FEL_libdir)/ghc-packages), \
$$(eval $$(call $1,$$(FEL_libroot)/$$(lib),$$(FEL_tag)))), \
$$(if $$(wildcard $$(FEL_libdir)/), \
$$(eval $$(call $1,$$(FEL_libroot),$$(FEL_tag))))))
endef
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