#

# Copyright (c) 2011, 2012, 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 contains helper functions for the top-level Makefile that does

# not depend on the spec.gmk file having been read. (The purpose of this 

# file is ju to avoid cluttering the top-level Makefile.)

#

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

ifndef _MAKEHELPERS_GMK

_MAKEHELPERS_GMK := 1

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

# Stuff to run at include time

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

# Find out which variables were passed explicitely on the make command line. These

# will be passed on to sub-makes, overriding spec.gmk settings.

MAKE_ARGS=$(foreach var,$(subst =command,,$(filter %=command,$(foreach var,$(.VARIABLES),$(var)=$(firstword $(origin $(var)))))),$(var)=$($(var)))

list_alt_overrides_with_origins=$(filter ALT_%=environment ALT_%=command,$(foreach var,$(.VARIABLES),$(var)=$(firstword $(origin $(var)))))

list_alt_overrides=$(subst =command,,$(subst =environment,,$(list_alt_overrides_with_origins)))

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

# Functions

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

define fatal-error

    # If the user specificed a "global" target (e.g. 'help'), do not exit but continue running

    $$(if $$(findstring help,$$(MAKECMDGOALS)),,$$(error Cannot continue))

endef

define ParseLogLevel

    ifeq ($$(origin VERBOSE),undefined)

        # Setup logging according to LOG (but only if VERBOSE is not given)

        ifeq ($$(LOG),)

            # Set LOG to "warn" as default if not set (and no VERBOSE given)

            LOG=warn

        endif

        ifeq ($$(LOG),warn)

            VERBOSE=-s

        else ifeq ($$(LOG),info)

            VERBOSE=

        else ifeq ($$(LOG),debug)

            VERBOSE=

        else ifeq ($$(LOG),trace)

            VERBOSE=-d -p

        else

            $$(info Error: LOG must be one of: warn, info, debug or trace.)

            $$(eval $$(call fatal-error))

        endif

    else

        ifneq ($$(LOG),)

            # We have both a VERBOSE and a LOG argument. This is OK only if this is a repeated call by ourselves,

            # but complain if this is the top-level make call.

            ifeq ($$(MAKELEVEL),0)

                $$(info Cannot use LOG=$$(LOG) and VERBOSE=$$(VERBOSE) at the same time. Choose one.)

                $$(eval $$(call fatal-error))

            endif

        endif

    endif

endef

# TODO: Fix duplication in MakeBase.gmk

define SetupLogging

    ifneq ($(findstring $(LOG),debug trace),)

        # Shell redefinition trick inspired by http://www.cmcrossroads.com/ask-mr-make/6535-tracing-rule-execution-in-gnu-make

        OLD_SHELL:=$$(SHELL)

        SHELL = $$(warning Building $$@$$(if $$<, (from $$<))$(if $$?, ($$? newer)))$$(OLD_SHELL) -x

    endif

endef

define ParseConfAndSpec

    ifneq ($$(origin SPEC),undefined)

        # We have been given a SPEC, check that it works out properly

        ifeq ($$(wildcard $$(SPEC)),)

            $$(info Cannot locate spec.gmk, given by SPEC=$$(SPEC))

            $$(eval $$(call fatal-error))

        endif

        ifneq ($$(origin CONF),undefined)

            # We also have a CONF argument. This is OK only if this is a repeated call by ourselves,

            # but complain if this is the top-level make call.

            ifeq ($$(MAKELEVEL),0)

                $$(info Cannot use CONF=$$(CONF) and SPEC=$$(SPEC) at the same time. Choose one.)

                $$(eval $$(call fatal-error))

            endif

        endif

        # ... OK, we're satisfied, we'll use this SPEC later on

    else

        # Find all spec.gmk files in the build output directory

        output_dir=$$(root_dir)/build

        all_spec_files=$$(wildcard $$(output_dir)/*/spec.gmk)

        ifeq ($$(all_spec_files),)

            $$(info No configurations found for $$(root_dir)! Please run configure to create a configuration.)

            $$(eval $$(call fatal-error))

        endif

        # Extract the configuration names from the path

        all_confs=$$(patsubst %/spec.gmk,%,$$(patsubst $$(output_dir)/%,%,$$(all_spec_files)))

        ifneq ($$(origin CONF),undefined)

            # User have given a CONF= argument.

            ifeq ($$(CONF),)

                # If given CONF=, match all configurations

                matching_confs=$$(strip $$(all_confs))

            else

                # Otherwise select those that contain the given CONF string

                matching_confs=$$(strip $$(foreach var,$$(all_confs),$$(if $$(findstring $$(CONF),$$(var)),$$(var))))

            endif

            ifeq ($$(matching_confs),)

                $$(info No configurations found matching CONF=$$(CONF))

                $$(info Available configurations:)

                $$(foreach var,$$(all_confs),$$(info * $$(var)))

                $$(eval $$(call fatal-error))

            else

                ifeq ($$(words $$(matching_confs)),1)

                    $$(info Building '$$(matching_confs)' (matching CONF=$$(CONF)))

                else

                    $$(info Building the following configurations (matching CONF=$$(CONF)):)

                    $$(foreach var,$$(matching_confs),$$(info * $$(var)))

                endif

            endif

            # Create a SPEC definition. This will contain the path to one or more spec.gmk files.

            SPEC=$$(addsuffix /spec.gmk,$$(addprefix $$(output_dir)/,$$(matching_confs)))

        else

            # No CONF or SPEC given, check the available configurations

            ifneq ($$(words $$(all_spec_files)),1)

                $$(info No CONF or SPEC given, but more than one spec.gmk found in $$(output_dir).)

                $$(info Available configurations:)

                $$(foreach var,$$(all_confs),$$(info * $$(var)))

                $$(info Please retry building with CONF=<config> or SPEC=<specfile>)

                $$(eval $$(call fatal-error))

            endif

            # We found exactly one configuration, use it

            SPEC=$$(strip $$(all_spec_files))

        endif

    endif

endef

define CheckEnvironment

    # Find all environment or command line variables that begin with ALT.

    $(if $(list_alt_overrides),

        @$(PRINTF) "\nWARNING: You have the following ALT_ variables set:\n"

    @$(PRINTF) "$(foreach var,$(list_alt_overrides),$(var)=$$$(var))\n"

    @$(PRINTF) "ALT_ variables are deprecated and will be ignored. Please clean your environment.\n\n"

    )

endef

define PrintStartMessage

    $(if $(VERBOSE),,@$(ECHO) Running make as $(MAKE) $(MFLAGS) $(MAKE_ARGS))

    $(call CheckEnvironment)

    @$(ECHO) "Building OpenJDK for target $(if $(MAKECMDGOALS),'$(MAKECMDGOALS)','all') in configuration '$(CONF_NAME)'"

endef

define PrintEndMessage

    @$(ECHO) "Finished building OpenJDK for target '$@'"

    $(call CheckEnvironment)

endef

endif # _MAKEHELPERS_GMK