From 0ceb295279190683d4121fbc4a7eb42597209d71 Mon Sep 17 00:00:00 2001
From: Xi Ruoyao <xry111@mengyan1223.wang>
Date: Sat, 13 Feb 2021 02:26:13 +0000
Subject: document x86 ISA level related breakage and workaround

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@12133 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
---
 chapter05/glibc.xml | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'chapter05')

diff --git a/chapter05/glibc.xml b/chapter05/glibc.xml
index 65f954305..ec22b8069 100644
--- a/chapter05/glibc.xml
+++ b/chapter05/glibc.xml
@@ -120,6 +120,17 @@ cd       build</userinput></screen>
         </listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><option>libc_cv_include_x86_isa_level=no</option></term>
+        <listitem>
+          <para>This disables <quote>x86 ISA needed</quote> property in
+          Glibc libraries.  Use it <emphasis role="bold">if</emphasis>
+          you are building Glibc with <option>-march</option> option in
+          <envar>CFLAGS</envar>, to workaround an issue in Glibc-2.33
+          breaking it.</para>
+        </listitem>
+      </varlistentry>
+
     </variablelist>
 
     <para>During this stage the following warning might appear:</para>
-- 
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