duke@435: #! /bin/sh
duke@435: #
trims@1907: # Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.
duke@435: # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435: #
duke@435: # This code is free software; you can redistribute it and/or modify it
duke@435: # under the terms of the GNU General Public License version 2 only, as
duke@435: # published by the Free Software Foundation.
duke@435: #
duke@435: # This code is distributed in the hope that it will be useful, but WITHOUT
duke@435: # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435: # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435: # version 2 for more details (a copy is included in the LICENSE file that
duke@435: # accompanied this code).
duke@435: #
duke@435: # You should have received a copy of the GNU General Public License version
duke@435: # 2 along with this work; if not, write to the Free Software Foundation,
duke@435: # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435: #
trims@1907: # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907: # or visit www.oracle.com if you need additional information or have any
trims@1907: # questions.
duke@435: #  
duke@435: #
duke@435: 
duke@435: # This script is used only from top.make.
duke@435: # The macro $(MFLAGS-adjusted) calls this script to
duke@435: # adjust the "-j" arguments to take into account
duke@435: # the HOTSPOT_BUILD_JOBS variable.  The default
duke@435: # handling of the "-j" argument by gnumake does
duke@435: # not meet our needs, so we must adjust it ourselves.
duke@435: 
duke@435: # This argument adjustment applies to two recursive
duke@435: # calls to "$(MAKE) $(MFLAGS-adjusted)" in top.make.
duke@435: # One invokes adlc.make, and the other invokes vm.make.
duke@435: # The adjustment propagates the desired concurrency
duke@435: # level down to the sub-make (of the adlc or vm).
duke@435: # The default behavior of gnumake is to run all
duke@435: # sub-makes without concurrency ("-j1").
duke@435: 
duke@435: # Also, we use a make variable rather than an explicit
duke@435: # "-j<N>" argument to control this setting, so that
duke@435: # the concurrency setting (which must be tuned separately
duke@435: # for each MP system) can be set via an environment variable.
duke@435: # The recommended setting is 1.5x to 2x the number of available
duke@435: # CPUs on the MP system, which is large enough to keep the CPUs
duke@435: # busy (even though some jobs may be I/O bound) but not too large,
duke@435: # we may presume, to overflow the system's swap space.
duke@435: 
duke@435: set -eu
duke@435: 
duke@435: default_build_jobs=4
duke@435: 
duke@435: case $# in
duke@435: [12])	true;;
duke@435: *)	>&2 echo "Usage: $0 ${MFLAGS} ${HOTSPOT_BUILD_JOBS}"; exit 2;;
duke@435: esac
duke@435: 
duke@435: MFLAGS=$1
duke@435: HOTSPOT_BUILD_JOBS=${2-}
duke@435: 
duke@435: # Normalize any -jN argument to the form " -j${HBJ}"
duke@435: MFLAGS=`
duke@435: 	echo "$MFLAGS" \
duke@435: 	| sed '
duke@435: 		s/^-/ -/
duke@435: 		s/ -\([^ 	][^ 	]*\)j/ -\1 -j/
duke@435: 		s/ -j[0-9][0-9]*/ -j/
duke@435: 		s/ -j\([^ 	]\)/ -j -\1/
duke@435: 		s/ -j/ -j'${HOTSPOT_BUILD_JOBS:-${default_build_jobs}}'/
duke@435: 	' `
duke@435: 
duke@435: case ${HOTSPOT_BUILD_JOBS} in \
duke@435: 
duke@435: '') case ${MFLAGS} in
duke@435:     *\ -j*)
duke@435: 	>&2 echo "# Note: -jN is ineffective for setting parallelism in this makefile." 
duke@435: 	>&2 echo "# please set HOTSPOT_BUILD_JOBS=${default_build_jobs} in the command line or environment."
duke@435:     esac;;
duke@435: 
duke@435: ?*) case ${MFLAGS} in
duke@435:      *\ -j*) true;;
duke@435:      *)      MFLAGS="-j${HOTSPOT_BUILD_JOBS} ${MFLAGS}";;
duke@435:     esac;;
duke@435: esac
duke@435: 
duke@435: echo "${MFLAGS}"