ax_count_cpus

Attempt to count the number of processors present on the machine. If the detection fails, then a value of 1 is assumed.

The value is placed in the CPU_COUNT variable.

AC_DEFUN([AX_COUNT_CPUS], [
    AC_REQUIRE([AC_PROG_EGREP])
    AC_MSG_CHECKING(the number of available CPUs)
    CPU_COUNT="0"

    #On MacOS
    if test -x /usr/sbin/sysctl -a `/sbin/sysctl -a 2>/dev/null| grep -c hw.cpu`; then
        CPU_COUNT=`/usr/sbin/sysctl -n hw.ncpu`
    fi

    #On Linux
    if test "x$CPU_COUNT" = "x0" -a -e /proc/cpuinfo; then
        CPU_COUNT=`$EGREP -c '^processor' /proc/cpuinfo`
    fi

    if test "x$CPU_COUNT" = "x0"; then
        CPU_COUNT="1"
        AC_MSG_RESULT( [unable to detect (assuming 1)] )
    else
        AC_MSG_RESULT( $CPU_COUNT )
    fi
])

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