From 95ebbb42b7eda5114e7ea751030916f9c9eaa5fb Mon Sep 17 00:00:00 2001
From: Xi Ruoyao <xry111@xry111.site>
Date: Mon, 11 Sep 2023 14:42:45 +0800
Subject: chroot: Set MAKEFLAGS and TESTSUITEFLAGS for parallelism

---
 chapter07/chroot.xml | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/chapter07/chroot.xml b/chapter07/chroot.xml
index b8de03dc2..a8cd5f878 100644
--- a/chapter07/chroot.xml
+++ b/chapter07/chroot.xml
@@ -23,8 +23,21 @@
     TERM="$TERM"                \
     PS1='(lfs chroot) \u:\w\$ ' \
     PATH=/usr/bin:/usr/sbin     \
+    MAKEFLAGS="-j<replaceable>$(nproc)</replaceable>"      \
+    TESTSUITEFLAGS="-j<replaceable>$(nproc)</replaceable>" \
     /bin/bash --login</userinput></screen>
 
+  <para>
+    Again, replace <replaceable>$(nproc)</replaceable> with the number
+    of logical cores you want to use for building packages in this chapter
+    and the following chapters if you don't want to use all available
+    logical cores.  The test suites of some packages (notably Autoconf,
+    Libtool, and Tar) in &ch-final; are not affected by
+    <envar>MAKEFLAGS</envar>, they use a <envar>TESTSUITEFLAGS</envar>
+    environment variable instead.  So we set it here as well for running
+    these test suites with multiple cores.
+  </para>
+
   <para>The <parameter>-i</parameter> option given to the <command>env</command>
   command will clear all the variables in the chroot environment. After that, only
   the <envar>HOME</envar>, <envar>TERM</envar>, <envar>PS1</envar>, and
-- 
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