1#!/usr/bin/env bash
2# Copyright 2017 Google Inc.
3# All Rights Reserved.
4#
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions are
8# met:
9#
10#     * Redistributions of source code must retain the above copyright
11# notice, this list of conditions and the following disclaimer.
12#     * Redistributions in binary form must reproduce the above
13# copyright notice, this list of conditions and the following disclaimer
14# in the documentation and/or other materials provided with the
15# distribution.
16#     * Neither the name of Google Inc. nor the names of its
17# contributors may be used to endorse or promote products derived from
18# this software without specific prior written permission.
19#
20# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31
32# This file is typically sourced by another script.
33# if possible, ask for the precise number of processors,
34# otherwise take 2 processors as reasonable default; see
35# https://docs.travis-ci.com/user/speeding-up-the-build/#Makefile-optimization
36if [ -x /usr/bin/getconf ]; then
37    NPROCESSORS=$(/usr/bin/getconf _NPROCESSORS_ONLN)
38else
39    NPROCESSORS=2
40fi
41
42# as of 2017-09-04 Travis CI reports 32 processors, but GCC build
43# crashes if parallelized too much (maybe memory consumption problem),
44# so limit to 4 processors for the time being.
45if [ $NPROCESSORS -gt 4 ] ; then
46	echo "$0:Note: Limiting processors to use by make from $NPROCESSORS to 4."
47	NPROCESSORS=4
48fi
49