linux/tools/perf/Makefile
Rasmus Villemoes da15fc2fa9 perf tools: Disable parallelism for 'make clean'
The Yocto build system does a 'make clean' when rebuilding due to
changed dependencies, and that consistently fails for me (causing the
whole BSP build to fail) with errors such as

| find: '[...]/perf/1.0-r9/perf-1.0/plugin_mac80211.so': No such file or directory
| find: '[...]/perf/1.0-r9/perf-1.0/plugin_mac80211.so': No such file or directory
| find: find: '[...]/perf/1.0-r9/perf-1.0/libtraceevent.a''[...]/perf/1.0-r9/perf-1.0/libtraceevent.a': No such file or directory: No such file or directory
|
[...]
| find: cannot delete '/mnt/xfs/devel/pil/yocto/tmp-glibc/work/wandboard-oe-linux-gnueabi/perf/1.0-r9/perf-1.0/util/.pstack.o.cmd': No such file or directory

Apparently (despite the comment), 'make clean' ends up launching
multiple sub-makes that all want to remove the same things - perhaps
this only happens in combination with a O=... parameter. In any case, we
don't lose much by explicitly disabling the parallelism for the clean
target, and it makes automated builds much more reliable.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180705131527.19749-1-linux@rasmusvillemoes.dk
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2018-08-20 08:54:58 -03:00

113 lines
2.5 KiB
Makefile

# 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 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