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

# global target is "help".

        # 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"

	)

	$(MKDIR) -p $(BUILDTIMESDIR)

	$(DATE) '+%Y %m %d %H %M %S' | $(NAWK) '{ print $$1,$$2,$$3,$$4,$$5,$$6,($$4*3600+$$5*60+$$6) }' > $(BUILDTIMESDIR)/build_time_start_$1

	$(DATE) '+%Y-%m-%d %H:%M:%S' > $(BUILDTIMESDIR)/build_time_start_$1_human_readable

# that a build will never take 24 hours or more.

	$(DATE) '+%Y %m %d %H %M %S' | $(NAWK) '{ print $$1,$$2,$$3,$$4,$$5,$$6,($$4*3600+$$5*60+$$6) }' > $(BUILDTIMESDIR)/build_time_end_$1

	$(DATE) '+%Y-%m-%d %H:%M:%S' > $(BUILDTIMESDIR)/build_time_end_$1_human_readable

	$(ECHO) `$(CAT) $(BUILDTIMESDIR)/build_time_start_$1` `$(CAT) $(BUILDTIMESDIR)/build_time_end_$1` $1 | \

	    $(NAWK) '{ F=$$7; T=$$14; if (F > T) { T+=3600*24 }; D=T-F; H=int(D/3600); \

	    M=int((D-H*3600)/60); S=D-H*3600-M*60; printf("%02d:%02d:%02d %s\n",H,M,S,$$15); }' \

	    > $(BUILDTIMESDIR)/build_time_diff_$1

	$(BUILD_LOG_WRAPPER) $(PRINTF) -- "----- Build times -------\nStart %s\nEnd   %s\n%s\n%s\n-------------------------\n" \

	    "`$(CAT) $(BUILDTIMESDIR)/build_time_start_TOTAL_human_readable`" \

	    "`$(CAT) $(BUILDTIMESDIR)/build_time_end_TOTAL_human_readable`" \

	    "`$(LS) $(BUILDTIMESDIR)/build_time_diff_* | $(GREP) -v _TOTAL | $(XARGS) $(CAT) | $(SORT) -k 2`" \

	    "`$(CAT) $(BUILDTIMESDIR)/build_time_diff_TOTAL`"

  $$(shell $(MKDIR) -p $(BUILDTIMESDIR) && $(RM) $(BUILDTIMESDIR)/build_time_*)

	$(call RecordStartTime,TOTAL)

	$(call RecordEndTime,TOTAL)

        # Check if the current target is the last goal

	$(if $(filter $@,$(call LastGoal)),$(call AtMakeEnd))

        # If the target is 'foo-only', check if our goal was stated as 'foo'

	$(if $(filter $@,$(call LastGoal)-only),$(call AtMakeEnd))

	$(BUILD_LOG_WRAPPER) $(PRINTF) "## Starting $(patsubst %-only,%,$@)\n"

	$(call RecordStartTime,$(patsubst %-only,%,$@))

	$(call RecordEndTime,$(patsubst %-only,%,$@))

	$(BUILD_LOG_WRAPPER) $(PRINTF) "## Finished $(patsubst %-only,%,$@) (build time %s)\n\n" \

	    "`$(CAT) $(BUILDTIMESDIR)/build_time_diff_$(patsubst %-only,%,$@) | $(CUT) -f 1 -d ' '`"

	$(call CheckIfMakeAtEnd)

	$(if $(findstring --jobserver,$(MAKEFLAGS)),$(error make -j is not supported, use make JOBS=n))

	$(call CheckEnvironment)

	@$(PRINTF) $(LOG_INFO) "Running make as '$(MAKE) $(MFLAGS) $(MAKE_ARGS)'\n"

	@$(PRINTF) "Building $(PRODUCT_NAME) for target '$(call GetRealTarget)' in configuration '$(CONF_NAME)'\n\n"

	$(call StartGlobalTimer)

	[ -f $(SJAVAC_SERVER_DIR)/server.port ] && echo Stopping sjavac server && $(TOUCH) $(SJAVAC_SERVER_DIR)/server.port.stop; true

	$(call StopGlobalTimer)

	$(call ReportBuildTimes)

	@$(PRINTF) "Finished building $(PRODUCT_NAME) for target '$(call GetRealTarget)'\n"

	$(call CheckEnvironment)

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

  $$(if $$(filter-out $(global_targets),$$(call GetRealTarget)),$$(error Cannot continue))

  ifeq ($$(origin VERBOSE),undefined)

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

    # If the "nofile" argument is given, act on it and strip it away

    ifneq ($$(findstring nofile,$$(LOG)),)

      # Reset the build log wrapper, regardless of other values

      override BUILD_LOG_WRAPPER=

      # COMMA is defined in spec.gmk, but that is not included yet

      COMMA=,

      # First try to remove ",nofile" if it exists

      LOG_STRIPPED1=$$(subst $$(COMMA)nofile,,$$(LOG))

      # Otherwise just remove "nofile"

      LOG_STRIPPED2=$$(subst nofile,,$$(LOG_STRIPPED1))

      # We might have ended up with a leading comma. Remove it

      LOG_STRIPPED3=$$(strip $$(patsubst $$(COMMA)%,%,$$(LOG_STRIPPED2)))

      LOG_LEVEL:=$$(LOG_STRIPPED3)

    else

      LOG_LEVEL:=$$(LOG)

    endif

    ifeq ($$(LOG_LEVEL),)

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

      override LOG_LEVEL=warn

    endif

    ifeq ($$(LOG_LEVEL),warn)

      VERBOSE=-s

    else ifeq ($$(LOG_LEVEL),info)

      VERBOSE=-s

    else ifeq ($$(LOG_LEVEL),debug)

      VERBOSE=

    else ifeq ($$(LOG_LEVEL),trace)

      VERBOSE=

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

      $$(eval $$(call FatalError))

    endif

  else

    # Provide resonable interpretations of LOG_LEVEL if VERBOSE is given.

    ifeq ($(VERBOSE),)

      LOG_LEVEL:=debug

    else

      LOG_LEVEL:=warn

    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 FatalError))

      endif

    endif

  endif

  ifneq ($$(filter-out $(global_targets),$$(call GetRealTarget)),)

    # If we only have global targets, no need to bother with SPEC or CONF

    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 FatalError))

      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 FatalError))

        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 FatalError))

      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 FatalError))

        else

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

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

          else

            $$(info Building target '$(call GetRealTarget)' in the following configurations (matching CONF=$$(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)

          $$(info No CONF given, but more than one configuration found in $$(output_dir).)

          $$(info Available configurations:)

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

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

          $$(eval $$(call FatalError))

        endif

        # We found exactly one configuration, use it

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

      endif

  endif

	@$(PRINTF) "Cleaning $1 build artifacts ..."

	@($(CD) $(OUTPUT_ROOT) && $(RM) -r $1)

	@$(PRINTF) " done\n"