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   1 # ===========================================================================
   2 #      http://www.gnu.org/software/autoconf-archive/ax_am_jobserver.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_AM_JOBSERVER([default_value])
   8 #
   9 # DESCRIPTION
  10 #
  11 #   Enables the use of make's jobserver for the purpose of parallel building
  12 #   by passing the -j option to make.
  13 #
  14 #   The option --enable-jobserver is added to configure which can accept a
  15 #   yes, no, or an integer. The integer is the number of separate jobs to
  16 #   allow. If 'yes' is given, then the is assumed to be one more than the
  17 #   number of CPUs (determined through AX_COUNT_CPUS). If the value of no is
  18 #   given, then the jobserver is disabled. The default value is given by the
  19 #   first argument of the macro, or 'yes' if the argument is omitted.
  20 #
  21 #   This macro makes use of AX_AM_MACROS, so you must add the following line
  22 #
  23 #     @INC_AMINCLUDE@
  24 #
  25 #   to your Makefile.am files.
  26 #
  27 # LICENSE
  28 #
  29 #   Copyright (c) 2008 Michael Paul Bailey <jinxidoru@byu.net>
  30 #
  31 #   Copying and distribution of this file, with or without modification, are
  32 #   permitted in any medium without royalty provided the copyright notice
  33 #   and this notice are preserved. This file is offered as-is, without any
  34 #   warranty.
  35
  36 #serial 7
  37
  38 AC_DEFUN([AX_AM_JOBSERVER], [
  39     AC_REQUIRE([AX_COUNT_CPUS])
  40     AC_REQUIRE([AX_AM_MACROS])
  41     AC_ARG_ENABLE( jobserver,
  42     [  --enable-jobserver@<:@=no/yes/@%:@@:>@ default=m4_ifval([$1],[$1],[yes])
  43                         Enable up to @%:@ make jobs
  44                         yes: enable one more than CPU count
  45     ],, [enable_jobserver=m4_ifval([$1],[$1],[yes])])
  46     if test "x$enable_jobserver" = "xyes"; then
  47         enable_jobserver=$CPU_COUNT
  48         ((enable_jobserver++))
  49     fi
  50     m4_pattern_allow(AM_MAKEFLAGS)
  51     if test "x$enable_jobserver" != "xno"; then
  52         AC_MSG_NOTICE([added jobserver support to make for $enable_jobserver jobs])
  53         AX_ADD_AM_MACRO( AM_MAKEFLAGS += -j$enable_jobserver )
  54     fi
  55 ])