1# SPDX-License-Identifier: GPL-2.0 2# 3# This is a simple wrapper Makefile that calls the main Makefile.perf 4# with a -j option to do parallel builds 5# 6# If you want to invoke the perf build in some non-standard way then 7# you can use the 'make -f Makefile.perf' method to invoke it. 8# 9 10# 11# Clear out the built-in rules GNU make defines by default (such as .o targets), 12# so that we pass through all targets to Makefile.perf: 13# 14.SUFFIXES: 15 16# 17# We don't want to pass along options like -j: 18# 19unexport MAKEFLAGS 20 21# 22# Do a parallel build with multiple jobs, based on the number of CPUs online 23# in this system: 'make -j8' on a 8-CPU system, etc. 24# 25# (To override it, run 'make JOBS=1' and similar.) 26# 27ifeq ($(JOBS),) 28 JOBS := $(shell (getconf _NPROCESSORS_ONLN || egrep -c '^processor|^CPU[0-9]' /proc/cpuinfo) 2>/dev/null) 29 ifeq ($(JOBS),0) 30 JOBS := 1 31 endif 32endif 33 34# 35# Only pass canonical directory names as the output directory: 36# 37ifneq ($(O),) 38 FULL_O := $(shell readlink -f $(O) || echo $(O)) 39endif 40 41# 42# Only accept the 'DEBUG' variable from the command line: 43# 44ifeq ("$(origin DEBUG)", "command line") 45 ifeq ($(DEBUG),) 46 override DEBUG = 0 47 else 48 SET_DEBUG = "DEBUG=$(DEBUG)" 49 endif 50else 51 override DEBUG = 0 52endif 53 54define print_msg 55 @printf ' BUILD: Doing '\''make \033[33m-j'$(JOBS)'\033[m'\'' parallel build\n' 56endef 57 58define make 59 @$(MAKE) -f Makefile.perf --no-print-directory -j$(JOBS) O=$(FULL_O) $(SET_DEBUG) $@ 60endef 61 62# 63# Needed if no target specified: 64# (Except for tags and TAGS targets. The reason is that the 65# Makefile does not treat tags/TAGS as targets but as files 66# and thus won't rebuilt them once they are in place.) 67# 68all tags TAGS: 69 $(print_msg) 70 $(make) 71 72ifdef MAKECMDGOALS 73has_clean := 0 74ifneq ($(filter clean,$(MAKECMDGOALS)),) 75 has_clean := 1 76endif # clean 77 78ifeq ($(has_clean),1) 79 rest := $(filter-out clean,$(MAKECMDGOALS)) 80 ifneq ($(rest),) 81$(rest): clean 82 endif # rest 83endif # has_clean 84endif # MAKECMDGOALS 85 86# 87# Explicitly disable parallelism for the clean target. 88# 89clean: 90 $(make) -j1 91 92# 93# The build-test target is not really parallel, don't print the jobs info, 94# it also uses only the tests/make targets that don't pollute the source 95# repository, i.e. that uses O= or builds the tarpkg outside the source 96# repo directories. 97# 98# For a full test, use: 99# 100# make -C tools/perf -f tests/make 101# 102build-test: 103 @$(MAKE) SHUF=1 -f tests/make REUSE_FEATURES_DUMP=1 MK=Makefile SET_PARALLEL=1 --no-print-directory tarpkg out 104 105# 106# All other targets get passed through: 107# 108%: FORCE 109 $(print_msg) 110 $(make) 111 112.PHONY: tags TAGS FORCE Makefile 113