#
# Copyright (c) 2012, 2025, Oracle and/or its affiliates. All rights reserved.
# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
#
# This code is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 only, as
# published by the Free Software Foundation.  Oracle designates this
# particular file as subject to the "Classpath" exception as provided
# by Oracle in the LICENSE file that accompanied this code.
#
# This code is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
# version 2 for more details (a copy is included in the LICENSE file that
# accompanied this code).
#
# You should have received a copy of the GNU General Public License version
# 2 along with this work; if not, write to the Free Software Foundation,
# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
# or visit www.oracle.com if you need additional information or have any
# questions.
#

################################################################################
# This file is the earliest part of the build bootstrap process (not counting
# Makefile that includes it). Its main responsibility is to figure out what
# configuration to use and pick up the corresponding SPEC file. It will then
# call Init.gmk with this SPEC for further bootstrapping.
################################################################################

# This must be the first rule
default:
.PHONY: default

# Inclusion of this pseudo-target will cause make to execute this file
# serially, regardless of -j.
.NOTPARALLEL:

IS_PREINIT_ENV := true

# Include our helper functions.
include $(TOPDIR)/make/PreInitSupport.gmk
include $(TOPDIR)/make/common/LogUtils.gmk

# Here are "global" targets, i.e. targets that can be executed without having
# a configuration. This will define ALL_GLOBAL_TARGETS.
include $(TOPDIR)/make/Global.gmk

# Targets provided by Init.gmk.
ALL_INIT_TARGETS := print-modules print-targets print-configuration \
    print-tests reconfigure pre-compare-build post-compare-build \
    create-make-helpers

# CALLED_TARGETS is the list of targets that the user provided,
# or "default" if unspecified.
CALLED_TARGETS := $(if $(MAKECMDGOALS), $(MAKECMDGOALS), default)

# Extract non-global targets that require a spec file.
CALLED_SPEC_TARGETS := $(filter-out $(ALL_GLOBAL_TARGETS), $(CALLED_TARGETS))

# If we have only global targets, or if we are called with -qp (assuming an
# external part, e.g. bash completion, is trying to understand our targets),
# we will skip SPEC location and the sanity checks.
ifeq ($(CALLED_SPEC_TARGETS), )
  SKIP_SPEC := true
endif
ifeq ($(findstring p, $(MAKEFLAGS))$(findstring q, $(MAKEFLAGS)), pq)
  SKIP_SPEC := true
endif

ifneq ($(SKIP_SPEC), true)

  ############################################################################
  # This is the common case: we have been called from the command line by the
  # user with a target that should be delegated to Main.gmk, so we need to
  # figure out a proper SPEC and call Init.gmk with it.
  ############################################################################

  # Basic checks on environment and command line.
  $(eval $(call CheckControlVariables))
  $(eval $(call CheckInvalidMakeFlags))

  # Check that CONF_CHECK is valid.
  $(eval $(call ParseConfCheckOption))

  # Check that the LOG given is valid, and set LOG_LEVEL, LOG_NOFILE,
  # MAKE_LOG_VARS and MAKE_LOG_FLAGS.
  $(eval $(call ParseLogLevel))

  # After this SPECS contain 1..N spec files (otherwise ParseConfAndSpec fails).
  $(eval $(call ParseConfAndSpec))

  # Extract main targets from Main.gmk using the spec(s) provided. In theory,
  # with multiple specs, we should find the intersection of targets provided
  # by all specs, but we approximate this by an arbitrary spec from the list.
  # This will setup ALL_MAIN_TARGETS.
  $(eval $(call DefineMainTargets, FORCE, $(firstword $(SPECS))))

  # Separate called targets depending on type.
  INIT_TARGETS := $(filter $(ALL_INIT_TARGETS), $(CALLED_SPEC_TARGETS))
  MAIN_TARGETS := $(filter $(ALL_MAIN_TARGETS), $(CALLED_SPEC_TARGETS))
  SEQUENTIAL_TARGETS := $(filter dist-clean clean%, $(MAIN_TARGETS))
  PARALLEL_TARGETS := $(filter-out $(SEQUENTIAL_TARGETS), $(MAIN_TARGETS))

  MAKE_INIT_ARGS := $(MFLAGS) $(MAKE_LOG_FLAGS) -r -R -I $(TOPDIR)/make/common

  # The spec files depend on the autoconf source code. This check makes sure
  # the configuration is up to date after changes to configure.
  $(SPECS): $(wildcard $(TOPDIR)/make/autoconf/*) \
          $(if $(CUSTOM_CONFIG_DIR), $(wildcard $(CUSTOM_CONFIG_DIR)/*)) \
          $(addprefix $(TOPDIR)/make/conf/, version-numbers.conf branding.conf) \
          $(if $(CUSTOM_CONF_DIR), $(wildcard $(addprefix $(CUSTOM_CONF_DIR)/, \
              version-numbers.conf branding.conf)))
      ifeq ($(CONF_CHECK), fail)
	@echo Error: The configuration is not up to date for \
	    "'$(lastword $(subst /, , $(dir $@)))'."
	$(call PrintConfCheckFailed)
	@exit 2
      else ifeq ($(CONF_CHECK), auto)
	@echo Note: The configuration is not up to date for \
	    "'$(lastword $(subst /, , $(dir $@)))'."
	@( cd $(TOPDIR) && \
	    $(MAKE) $(MAKE_INIT_ARGS) -f $(TOPDIR)/make/Init.gmk SPEC=$@ \
	    reconfigure )
      else ifeq ($(CONF_CHECK), ignore)
        # Do nothing
      endif

  # Do not let make delete spec files even if aborted while doing a reconfigure
  .PRECIOUS: $(SPECS)

  # Unless reconfigure is explicitly called, let all main targets depend on
  # the spec files to be up to date.
  ifeq ($(findstring reconfigure, $(INIT_TARGETS)), )
    $(MAIN_TARGETS): $(SPECS)
  endif

  make-info:
      ifneq ($(findstring $(LOG_LEVEL), info debug trace), )
	  $(info Running make as '$(strip $(MAKE) $(MFLAGS) \
	      $(COMMAND_LINE_VARIABLES) $(MAKECMDGOALS))')
      endif

  MAKE_INIT_MAIN_TARGET_ARGS := \
      USER_MAKE_VARS="$(USER_MAKE_VARS)" MAKE_LOG_FLAGS=$(MAKE_LOG_FLAGS) \
      $(MAKE_LOG_VARS) \
      INIT_TARGETS="$(INIT_TARGETS)" \
      SEQUENTIAL_TARGETS="$(SEQUENTIAL_TARGETS)" \
      PARALLEL_TARGETS="$(PARALLEL_TARGETS)"

  # Now the init and main targets will be called, once for each SPEC. The
  # recipe will be run once for every target specified, but we only want to
  # execute the recipe a single time, hence the TARGET_DONE with a dummy
  # command if true.
  # The COMPARE_BUILD part implements special support for makefile development.
  $(ALL_INIT_TARGETS) $(ALL_MAIN_TARGETS): make-info
	@$(if $(TARGET_DONE), \
	  true \
	, \
	  ( cd $(TOPDIR) && \
	  $(foreach spec, $(SPECS), \
	    $(MAKE) $(MAKE_INIT_ARGS) -j 1 -f $(TOPDIR)/make/Init.gmk \
	        SPEC=$(spec) TOPDIR_ALT=$(TOPDIR) \
	        $(MAKE_INIT_MAIN_TARGET_ARGS) main && \
	    $(if $(and $(COMPARE_BUILD), $(PARALLEL_TARGETS)), \
	      $(MAKE) $(MAKE_INIT_ARGS) -f $(TOPDIR)/make/Init.gmk \
	          SPEC=$(spec) TOPDIR_ALT=$(TOPDIR) \
	          COMPARE_BUILD="$(COMPARE_BUILD)" \
	          pre-compare-build && \
	      $(MAKE) $(MAKE_INIT_ARGS) -j 1 -f $(TOPDIR)/make/Init.gmk \
	          SPEC=$(spec) TOPDIR_ALT=$(TOPDIR) \
	          COMPARE_BUILD="$(COMPARE_BUILD):NODRYRUN=true" \
	          $(MAKE_INIT_MAIN_TARGET_ARGS) main && \
	      $(MAKE) $(MAKE_INIT_ARGS) -f $(TOPDIR)/make/Init.gmk \
	          SPEC=$(spec) TOPDIR_ALT=$(TOPDIR) \
	          COMPARE_BUILD="$(COMPARE_BUILD):NODRYRUN=true" \
	          post-compare-build && \
	    ) \
	  ) true ) \
	  $(eval TARGET_DONE=true) \
	)

  .PHONY: $(ALL_MAIN_TARGETS) $(ALL_INIT_TARGETS)

else # SKIP_SPEC=true

  ############################################################################
  # We have only global targets, or are called with -pq (from command
  # completion). In this case we might not even have a configuration at all, but
  # still need to handle the situation gracefully even if there is no SPEC file.
  ############################################################################

  ifeq ($(wildcard $(SPEC)), )
    # If we have no SPEC provided, we will just make a "best effort" target list.
    # First try to grab any available pre-existing main-targets.gmk.
    main_targets_file := $(firstword $(wildcard $(build_dir)/*/make-support/main-targets.gmk))
    ifneq ($(main_targets_file), )
      # Extract the SPEC that corresponds to this main-targets.gmk file.
      SPEC := $(patsubst %/make-support/main-targets.gmk, %/spec.gmk, $(main_targets_file))
    else
      # None found, pick an arbitrary SPEC for which to generate a file
      SPEC := $(firstword $(all_spec_files))
    endif
  endif

  ifneq ($(wildcard $(SPEC)), )
    $(eval $(call DefineMainTargets, LAZY, $(SPEC)))
  else
    # If we have no configurations we can not provide any main targets.
    ALL_MAIN_TARGETS :=
  endif

  ALL_TARGETS := $(sort $(ALL_GLOBAL_TARGETS) $(ALL_MAIN_TARGETS) $(ALL_INIT_TARGETS))

  # Just list all our targets.
  $(ALL_TARGETS):

  .PHONY: $(ALL_TARGETS)

endif # $(SKIP_SPEC)!=true

################################################################################