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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 | |
36 | if [ -x /usr/bin/getconf ]; then | |
37 | NPROCESSORS=$(/usr/bin/getconf _NPROCESSORS_ONLN) | |
38 | else | |
39 | NPROCESSORS=2 | |
40 | fi | |
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. | |
45 | if [ $NPROCESSORS -gt 4 ] ; then | |
46 | echo "$0:Note: Limiting processors to use by make from $NPROCESSORS to 4." | |
47 | NPROCESSORS=4 | |
48 | fi |