#       ==============================================================
#       Copyright (c) 2001 Tim Barbour.
#       All Rights Reserved.
#       This make library may be used and distributed under the terms
#       of the GNU LGPL, as published by the Free Software Foundation.
#       See the file COPYING for details.
#       ==============================================================
#	$Id: find_target_platforms.mk,v 1.4 2001/12/11 04:08:22 trb Exp $	

#-------------------------------------------------------------------------------------------------------
# text requires: DEFAULT_TARGET_PLATFORMS TARGET_PLATFORMS
#-------------------------------------------------------------------------------------------------------
# refers to: INAPPROPRIATE_TARGET_PLATFORMS ONLY_TARGET_PLATFORMS
#-------------------------------------------------------------------------------------------------------
# provides variables: target_platforms
#-------------------------------------------------------------------------------------------------------

# there must always be at least one target_platform
ifneq ($(strip $(DEFAULT_TARGET_PLATFORMS)),)
   default_target_platforms = $(DEFAULT_TARGET_PLATFORMS)
else
   default_target_platforms = host
endif
ifneq ($(strip $(TARGET_PLATFORMS)),)
   target_platforms0 = $(TARGET_PLATFORMS)
else
   target_platforms0 = $(default_target_platforms)
endif

# we support a shorthand name ("host") for the host platform
target_platforms1 = $(patsubst host,$(host_platform),$(target_platforms0))

ifeq ($(strip $(INAPPROPRIATE_TARGET_PLATFORMS)),)
   target_platforms2 = $(target_platforms1)
else
   target_platforms2 = $(shell echo "$(target_platforms1)" | $(TR) ' ' '\n' | $(GREP) -v $(INAPPROPRIATE_TARGET_PLATFORMS) | $(TR) ' ' '\n')
endif
ifeq ($(strip $(ONLY_TARGET_PLATFORMS_CONTAINING)),)
   target_platforms := $(target_platforms2)
else
   target_platforms := $(shell echo "$(target_platforms2)" | $(TR) ' ' '\n' | $(GREP) -i $(ONLY_TARGET_PLATFORMS_CONTAINING) | $(TR) ' ' '\n')
endif