xref: /linux/tools/perf/Makefile (revision 71e2f4dd5a65bd8dbca0b77661e75eea471168f8)
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