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+# 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'$(JOBS)'\033[m'\'' parallel build\n'
+endef
+
+define make
+ @$(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