ax_am_jobserver

Enables the use of make's jobserver for the purpose of parallel building by passing the -j option to make.

The option --enable-jobserver is added to configure which can accept a yes, no, or an integer. The integer is the number of separate jobs to allow. If 'yes' is given, then the is assumed to be one more than the number of CPUs (determined through AX_COUNT_CPUS). If the value of no is given, then the jobserver is disabled. The default value is given by the first argument of the macro, or 'yes' if the argument is omitted.

This macro makes use of AX_AM_MACROS, so you must add the following line

  @INC_AMINCLUDE@

to your Makefile.am files.

AC_DEFUN([AX_AM_JOBSERVER], [
    AC_REQUIRE([AX_COUNT_CPUS])
    AC_REQUIRE([AX_AM_MACROS])
    AC_ARG_ENABLE( jobserver,
    [  --enable-jobserver@<:@=no/yes/@%:@@:>@ default=m4_ifval([$1],[$1],[yes])
                        Enable up to @%:@ make jobs
                        yes: enable one more than CPU count
    ],, [enable_jobserver=m4_ifval([$1],[$1],[yes])])
    if test "x$enable_jobserver" = "xyes"; then
        enable_jobserver=$CPU_COUNT
        ((enable_jobserver++))
    fi
    m4_pattern_allow(AM_MAKEFLAGS)
    if test "x$enable_jobserver" != "xno"; then
        AC_MSG_NOTICE([added jobserver support to make for $enable_jobserver jobs])
        AX_ADD_AM_MACRO( AM_MAKEFLAGS += -j$enable_jobserver )
    fi
])

Copyright © 2006 Michael Paul Bailey <jinxidoru@byu.net>

Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.