#! /bin/sh

#

# Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.

# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

#

# This code is free software; you can redistribute it and/or modify it

# under the terms of the GNU General Public License version 2 only, as

# published by the Free Software Foundation.

#

# This code is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

# version 2 for more details (a copy is included in the LICENSE file that

# accompanied this code).

#

# You should have received a copy of the GNU General Public License version

# 2 along with this work; if not, write to the Free Software Foundation,

# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

#

# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

# or visit www.oracle.com if you need additional information or have any

# questions.

#  

#

# This script is used only from top.make.

# The macro $(MFLAGS-adjusted) calls this script to

# adjust the "-j" arguments to take into account

# the HOTSPOT_BUILD_JOBS variable.  The default

# handling of the "-j" argument by gnumake does

# not meet our needs, so we must adjust it ourselves.

# This argument adjustment applies to two recursive

# calls to "$(MAKE) $(MFLAGS-adjusted)" in top.make.

# One invokes adlc.make, and the other invokes vm.make.

# The adjustment propagates the desired concurrency

# level down to the sub-make (of the adlc or vm).

# The default behavior of gnumake is to run all

# sub-makes without concurrency ("-j1").

# Also, we use a make variable rather than an explicit

# "-j<N>" argument to control this setting, so that

# the concurrency setting (which must be tuned separately

# for each MP system) can be set via an environment variable.

# The recommended setting is 1.5x to 2x the number of available

# CPUs on the MP system, which is large enough to keep the CPUs

# busy (even though some jobs may be I/O bound) but not too large,

# we may presume, to overflow the system's swap space.

set -eu

default_build_jobs=4

case $# in

[12])	true;;

*)	>&2 echo "Usage: $0 ${MFLAGS} ${HOTSPOT_BUILD_JOBS}"; exit 2;;

esac

MFLAGS=$1

HOTSPOT_BUILD_JOBS=${2-}

# Normalize any -jN argument to the form " -j${HBJ}"

MFLAGS=`

	echo "$MFLAGS" \

	| sed '

		s/^-/ -/

		s/ -\([^ 	I][^ 	I]*\)j/ -\1 -j/

		s/ -j[0-9][0-9]*/ -j/

		s/ -j\([^ 	]\)/ -j -\1/

		s/ -j/ -j'${HOTSPOT_BUILD_JOBS:-${default_build_jobs}}'/

	' `

case ${HOTSPOT_BUILD_JOBS} in \

'') case ${MFLAGS} in

    *\ -j*)

	>&2 echo "# Note: -jN is ineffective for setting parallelism in this makefile." 

	>&2 echo "# please set HOTSPOT_BUILD_JOBS=${default_build_jobs} in the command line or environment."

    esac;;

?*) case ${MFLAGS} in

     *\ -j*) true;;

     *)      MFLAGS="-j${HOTSPOT_BUILD_JOBS} ${MFLAGS}";;

    esac;;

esac

echo "${MFLAGS}"