#*************************************************************************
# Copyright (c) 2013 UChicago Argonne LLC, as Operator of Argonne
#     National Laboratory.
# Copyright (c) 2002 The Regents of the University of California, as
#     Operator of Los Alamos National Laboratory.
# EPICS BASE is distributed subject to a Software License Agreement found
# in the file LICENSE that is included with this distribution.
#*************************************************************************

#
#  Common build definitions
#

ifneq ($(wildcard $(TOP)/configure/CONFIG_BASE_VERSION),)
  EPICS_BASE = $(INSTALL_LOCATION)
  CONFIG = $(TOP)/configure
  BASE_TOP=YES
else
  ifneq ($(origin EPICS_BASE),file)
    # Essential for the EPICS build system, see convertRelease.pl
    $(error EPICS_BASE must be set in a configure/RELEASE file)
  endif
  CONFIG ?= $(EPICS_BASE)/configure
endif

# Provide a default if the user hasn't set EPICS_HOST_ARCH
#
ifeq ($(origin EPICS_HOST_ARCH), undefined)
  # Bootstrapping ...
  EHA := $(firstword $(wildcard $(EPICS_BASE)/lib/perl/EpicsHostArch.pl \
        $(TOP)/src/tools/EpicsHostArch.pl))
  # NB: We use a simply expanded variable here for performance:
  export EPICS_HOST_ARCH := $(shell perl $(EHA))
  EHA :=
endif

# Make Perl hash iteration reproducible.
# See: https://reproducible-builds.org/docs/stable-outputs/
#
export PERL_HASH_SEED = 0

-include $(CONFIG)/RELEASE
-include $(CONFIG)/RELEASE.$(EPICS_HOST_ARCH)
-include $(CONFIG)/RELEASE.$(EPICS_HOST_ARCH).Common
ifdef T_A
  -include $(CONFIG)/RELEASE.Common.$(T_A)
  -include $(CONFIG)/RELEASE.$(EPICS_HOST_ARCH).$(T_A)
endif

include $(CONFIG)/CONFIG_COMMON
include $(CONFIG)/CONFIG_FILE_TYPE

#  Base-specific build options
#
include $(CONFIG)/CONFIG_BASE

#  Site-specific build options
#
include $(CONFIG)/CONFIG_SITE

#  Version numbering
#
include $(CONFIG)/CONFIG_BASE_VERSION

#  Host architecture specific definitions
#
include $(CONFIG)/os/CONFIG.$(EPICS_HOST_ARCH).Common
-include $(CONFIG)/os/CONFIG_SITE.$(EPICS_HOST_ARCH).Common

# Parse configure/RELEASE to find all upstream modules
RELEASE_TOPS := $(shell $(CONVERTRELEASE) -T $(TOP) releaseTops)

ifdef T_A
  # Information from the target's compiler
  #
  -include $(EPICS_BASE)/cfg/TOOLCHAIN.$(EPICS_HOST_ARCH).$(T_A)

  #  Cross compile specific definitions
  #
  ifneq ($(EPICS_HOST_ARCH),$(T_A))
    include $(CONFIG)/CONFIG.CrossCommon
  endif

  #  Target architecture specific definitions
  #
  -include $(CONFIG)/os/CONFIG.Common.$(T_A)

  #  Host-Target architecture specific definitions
  #
  -include $(CONFIG)/os/CONFIG.$(EPICS_HOST_ARCH).$(T_A)

  #  Site specific target and host-target definitions and overrides
  #
  -include $(CONFIG)/os/CONFIG_SITE.Common.$(T_A)
  -include $(CONFIG)/os/CONFIG_SITE.$(EPICS_HOST_ARCH).$(T_A)

  #  RELEASE file specific definitions
  #
  ifneq ($(CONFIG),$(TOP)/configure)
    -include $(CONFIG)/CONFIG_APP_INCLUDE
  endif

endif # ifdef T_A


# Include <top>/cfg/CONFIG* definitions from tops defined in RELEASE* files
#
ifneq ($(CONFIG),$(TOP)/configure)
  RELEASE_TOPS_REVERSE := $(shell \
      $(PERL) -e '$$,=" ";print reverse @ARGV' $(RELEASE_TOPS))
  RELEASE_CFG_CONFIGS = $(foreach top, $(RELEASE_TOPS_REVERSE), \
      $(wildcard $($(top))/cfg/CONFIG*))
  ifneq ($(RELEASE_CFG_CONFIGS),)
    include $(RELEASE_CFG_CONFIGS)
  endif
endif

# Include $(INSTALL_CFG)/CONFIG* definitions
#
TOP_CFG_CONFIGS = $(wildcard $(INSTALL_CFG)/CONFIG*)
ifneq ($(TOP_CFG_CONFIGS),)
  include $(TOP_CFG_CONFIGS)
endif

#  User specific definitions
#
-include $(HOME)/configure/CONFIG_USER
-include $(HOME)/configure/CONFIG_USER.$(EPICS_HOST_ARCH)
ifdef T_A
  -include $(HOME)/configure/CONFIG_USER.Common.$(T_A)
  -include $(HOME)/configure/CONFIG_USER.$(EPICS_HOST_ARCH).$(T_A)
endif