tools/perf/Makefile

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