#! /bin/sh+
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#+
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# Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.+
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# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.+
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#+
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# This code is free software; you can redistribute it and/or modify it+
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# under the terms of the GNU General Public License version 2 only, as+
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# published by the Free Software Foundation.+
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#+
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# This code is distributed in the hope that it will be useful, but WITHOUT+
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or+
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# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License+
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# version 2 for more details (a copy is included in the LICENSE file that+
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# accompanied this code).+
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#+
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# You should have received a copy of the GNU General Public License version+
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# 2 along with this work; if not, write to the Free Software Foundation,+
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.+
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#+
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# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA+
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# or visit www.oracle.com if you need additional information or have any+
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# questions.+
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#  +
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#+
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+
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# This script is used only from top.make.+
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# The macro $(MFLAGS-adjusted) calls this script to+
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# adjust the "-j" arguments to take into account+
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# the HOTSPOT_BUILD_JOBS variable.  The default+
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# handling of the "-j" argument by gnumake does+
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# not meet our needs, so we must adjust it ourselves.+
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+
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# This argument adjustment applies to two recursive+
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# calls to "$(MAKE) $(MFLAGS-adjusted)" in top.make.+
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# One invokes adlc.make, and the other invokes vm.make.+
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# The adjustment propagates the desired concurrency+
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# level down to the sub-make (of the adlc or vm).+
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# The default behavior of gnumake is to run all+
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# sub-makes without concurrency ("-j1").+
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+
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# Also, we use a make variable rather than an explicit+
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# "-j<N>" argument to control this setting, so that+
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# the concurrency setting (which must be tuned separately+
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# for each MP system) can be set via an environment variable.+
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# The recommended setting is 1.5x to 2x the number of available+
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# CPUs on the MP system, which is large enough to keep the CPUs+
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# busy (even though some jobs may be I/O bound) but not too large,+
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# we may presume, to overflow the system's swap space.+
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+
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set -eu+
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+
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default_build_jobs=4+
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+
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case $# in+
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[12])	true;;+
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*)	>&2 echo "Usage: $0 ${MFLAGS} ${HOTSPOT_BUILD_JOBS}"; exit 2;;+
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esac+
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+
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MFLAGS=$1+
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HOTSPOT_BUILD_JOBS=${2-}+
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+
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# Normalize any -jN argument to the form " -j${HBJ}"+
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MFLAGS=`+
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	echo "$MFLAGS" \+
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	| sed '+
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		s/^-/ -/+
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		s/ -\([^ 	][^ 	]*\)j/ -\1 -j/+
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		s/ -j[0-9][0-9]*/ -j/+
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		s/ -j\([^ 	]\)/ -j -\1/+
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		s/ -j/ -j'${HOTSPOT_BUILD_JOBS:-${default_build_jobs}}'/+
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	' `+
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+
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case ${HOTSPOT_BUILD_JOBS} in \+
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+
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'') case ${MFLAGS} in+
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    *\ -j*)+
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	>&2 echo "# Note: -jN is ineffective for setting parallelism in this makefile." +
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	>&2 echo "# please set HOTSPOT_BUILD_JOBS=${default_build_jobs} in the command line or environment."+
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    esac;;+
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+
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?*) case ${MFLAGS} in+
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     *\ -j*) true;;+
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     *)      MFLAGS="-j${HOTSPOT_BUILD_JOBS} ${MFLAGS}";;+
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    esac;;+
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esac+
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+
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echo "${MFLAGS}"+
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