1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0+
3#
4# Figure out if we should follow a specific parallelism from the make
5# environment (as exported by scripts/jobserver-exec), or fall back to
6# the "auto" parallelism when "-jN" is not specified at the top-level
7# "make" invocation.
8
9sphinx="$1"
10shift || true
11
12parallel="$PARALLELISM"
13if [ -z "$parallel" ] ; then
14	# If no parallelism is specified at the top-level make, then
15	# fall back to the expected "-jauto" mode that the "htmldocs"
16	# target has had.
17	auto=$(perl -e 'open IN,"'"$sphinx"' --version 2>&1 |";
18			while (<IN>) {
19				if (m/([\d\.]+)/) {
20					print "auto" if ($1 >= "1.7")
21				}
22			}
23			close IN')
24	if [ -n "$auto" ] ; then
25		parallel="$auto"
26	fi
27fi
28# Only if some parallelism has been determined do we add the -jN option.
29if [ -n "$parallel" ] ; then
30	parallel="-j$parallel"
31fi
32
33exec "$sphinx" "$parallel" "$@"
34