From d0de26cbe0bf877b25219936b7b688f0b17d0a16 Mon Sep 17 00:00:00 2001
From: Xi Ruoyao <xry111@xry111.site>
Date: Thu, 27 Jul 2023 13:06:49 +0800
Subject: [PATCH] gmp: (Optionally) use --host=none-linux-gnu for generic
 library

This is suggested by GCC maintainer Andrew Pinski in
https://gcc.gnu.org/PR110789.  It's easier than what we've suggested
in the book.
---
 chapter08/gmp.xml | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/chapter08/gmp.xml b/chapter08/gmp.xml
index 0820f726c..01dace92f 100644
--- a/chapter08/gmp.xml
+++ b/chapter08/gmp.xml
@@ -54,10 +54,12 @@
       <para>The default settings of GMP produce libraries optimized for
       the host processor.  If libraries suitable for processors less
       capable than the host's CPU are desired, generic libraries can be
-      created by running the following:
+      created by appending the <option>--host=none-linux-gnu</option> option
+      to the <command>configure</command> command.</para>
 
-<screen role="nodump"><userinput>cp -v configfsf.guess config.guess
-cp -v configfsf.sub   config.sub</userinput></screen></para>
+      <!-- To editors: the configure script says "the none host is obsolete,
+           use - -disable-assembly", but don't believe it: with the latter
+           CFLAGS is still automatically set to -march=something.  -->
     </note>
 
     <para>Prepare GMP for compilation:</para>
@@ -106,7 +108,7 @@ make html</userinput></screen>
     the system capabilities and there will be errors in the tests or other
     applications using the gmp libraries with the message "Illegal
     instruction".  In this case, gmp should be reconfigured with the option
-    --build=x86_64-pc-linux-gnu and rebuilt.</para></caution>
+    <option>--host=none-linux-gnu</option> and rebuilt.</para></caution>
 
     <para>Ensure that all 197 tests in the test suite passed.
     Check the results by issuing the following command:</para>