# ----------------------------------------------------------------------------
#
# GNU Make Standard Library (GMSL)
#
# A library of functions to be used with GNU Make's $(call) that
# provides functionality not available in standard GNU Make.
#
# Copyright (c) 2005-2020 John Graham-Cumming
#
# This file is part of GMSL
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# Neither the name of the John Graham-Cumming nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# ----------------------------------------------------------------------------

# Determine if the library has already been included and if so don't
# bother including it again

ifndef __gmsl_included

# Standard definitions for true and false.  true is any non-empty
# string, false is an empty string. These are intended for use with
# $(if).

true  := T
false :=

# ----------------------------------------------------------------------------
# Function:  not
# Arguments: 1: A boolean value
# Returns:   Returns the opposite of the arg. (true -> false, false -> true)
# ----------------------------------------------------------------------------
not = $(if $1,$(false),$(true))

# Prevent reinclusion of the library

__gmsl_included := $(true)

# Try to determine where this file is located.  If the caller did
# include /foo/gmsl then extract the /foo/ so that __gmsl gets
# included transparently

__gmsl_root :=

ifneq ($(MAKEFILE_LIST),)
__gmsl_root := $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))

# If there are any spaces in the path in __gmsl_root then give up

ifeq (1,$(words $(__gmsl_root)))
__gmsl_root := $(patsubst %gmsl,%,$(__gmsl_root))
endif

endif

include $(__gmsl_root)__gmsl

endif # __gmsl_included

