# -*- makefile -*-
# -----------------------------------------------------------------------
# Intent: Dependency-free macros used to source library makefiles
#         and define the build environment.
# -----------------------------------------------------------------------

$(if $(DEBUG-bootstrap_mk),$(warning ENTER))

##---------------------##
##---]  CONSTANTS  [---##
##---------------------##
is-false = $(if $(1),true,$(null))
is-true  = $(if $(1),$(null),true)

##--------------------------##
##---]  LIBRARY MACROS  [---##
##--------------------------##
is-null              = $(if $(1),$(null),$(error $(1)= is undef))
is-null-var          = $(if $$(1),$(null),$(error $(1)= is undef))
is-null-var-indirect = $(if $(1),$(null),$(error $(1)= is undef))

## variable flavor:
# origin - undefned
# default
# environment
# environment override
# automatic
# null(blah) ?   - true

## -----------------------------------------------------------------------
## Intent: Given an indirect var containing varname of a makefile *_ROOT
##         parent director, derive a *_MKDIR variable and conditionally
##         include the makefile hierarchy.
## -----------------------------------------------------------------------
## Given:
##   o var containing OPT_ROOT=path
## Return:
##   o OPT_MKDIR=$(OPT_ROOT)/makefiles
##   o If exists include $(OPT_MKDIR)/include.mk
## -----------------------------------------------------------------------
mk-library-include=$(strip \
  $(warning mk-library-include: $(1) = $($(1)))\
  $(call is-null-var,1)\
  $(foreach var,$$(1),\
    $(info var=$(var) is-null=$(call is-null-var,var))\
  $(foreach val,$$(var),\
    $(info val=$(val))\ 
    $(foreach makedir,$(subst _ROOT,_MKDIR,$(var)),\
$(warning makedir=$(makedir))\
      $(if $($(makedir)),$(null),\
        $(eval $(makedir)=$$$$($(var))/makefiles)\
$(warning $(makedir) = $($($(makedir))))\
$(info $$(wildcard $(val)/makefiles/include.mk) = $(wildcard $(val)/makefiles/include.mk))\
        $(foreach mf,$(wildcard $(wildcard $(val)/makefiles/include.mk)),\
$(warning $$(eval include $(mf)))\
          $(eval include $(mf)))\
)

$(if $(DEBUG-bootstrap_mk),$(warning LEAVE))

# [EOF]