# SPDX-License-Identifier: GPL-2.0

  #
  # This is a simple wrapper Makefile that calls the main Makefile.perf
  # with a -j option to do parallel builds
  #
  # If you want to invoke the perf build in some non-standard way then
  # you can use the 'make -f Makefile.perf' method to invoke it.
  #

  
  #
  # Clear out the built-in rules GNU make defines by default (such as .o targets),
  # so that we pass through all targets to Makefile.perf:
  #
  .SUFFIXES:

  #

  # We don't want to pass along options like -j:
  #
  unexport MAKEFLAGS
  
  #

  # Do a parallel build with multiple jobs, based on the number of CPUs online
  # in this system: 'make -j8' on a 8-CPU system, etc.

  #

  # (To override it, run 'make JOBS=1' and similar.)

  #

  ifeq ($(JOBS),)

    JOBS := $(shell (getconf _NPROCESSORS_ONLN || egrep -c '^processor|^CPU[0-9]' /proc/cpuinfo) 2>/dev/null)

    ifeq ($(JOBS),0)

      JOBS := 1

    endif

  endif

  #
  # Only pass canonical directory names as the output directory:
  #
  ifneq ($(O),)

    FULL_O := $(shell cd $(PWD); readlink -f $(O) || echo $(O))

  endif

  #
  # Only accept the 'DEBUG' variable from the command line:
  #
  ifeq ("$(origin DEBUG)", "command line")
    ifeq ($(DEBUG),)
      override DEBUG = 0
    else
      SET_DEBUG = "DEBUG=$(DEBUG)"
    endif
  else
    override DEBUG = 0
  endif

  define print_msg

    @printf '  BUILD:   Doing '\''make \033[33m-j'$(JOBS)'\033[m'\'' parallel build
  '

  endef
  
  define make

    @$(MAKE) -f Makefile.perf --no-print-directory -j$(JOBS) O=$(FULL_O) $(SET_DEBUG) $@

  endef

  #

  # Needed if no target specified:

  # (Except for tags and TAGS targets. The reason is that the
  # Makefile does not treat tags/TAGS as targets but as files
  # and thus won't rebuilt them once they are in place.)

  #

  all tags TAGS:

  	$(print_msg)
  	$(make)

  ifdef MAKECMDGOALS
  has_clean := 0
  ifneq ($(filter clean,$(MAKECMDGOALS)),)
    has_clean := 1
  endif # clean
  
  ifeq ($(has_clean),1)
    rest := $(filter-out clean,$(MAKECMDGOALS))
    ifneq ($(rest),)
  $(rest): clean
    endif # rest
  endif # has_clean
  endif # MAKECMDGOALS

  #

  # Explicitly disable parallelism for the clean target.

  #
  clean:

  	$(make) -j1

  #

  # The build-test target is not really parallel, don't print the jobs info,
  # it also uses only the tests/make targets that don't pollute the source
  # repository, i.e. that uses O= or builds the tarpkg outside the source
  # repo directories.
  #
  # For a full test, use:
  #
  # make -C tools/perf -f tests/make

  #
  build-test:

  	@$(MAKE) SHUF=1 -f tests/make REUSE_FEATURES_DUMP=1 MK=Makefile SET_PARALLEL=1 --no-print-directory tarpkg out

  
  #

  # All other targets get passed through:
  #

  %: FORCE

  	$(print_msg)
  	$(make)

  .PHONY: tags TAGS FORCE Makefile