From 1c6f1c1e4177cf26946a7cf8865f15be1405d9b6 Mon Sep 17 00:00:00 2001
From: Jeremy Huntwork <jhuntwork@linuxfromscratch.org>
Date: Wed, 23 Apr 2008 18:33:53 +0000
Subject: Use -mtune=native for glibc. We don't want our libc optimized for
 486. It should be optimized for the local machine.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8541 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
---
 chapter05/glibc.xml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'chapter05')

diff --git a/chapter05/glibc.xml b/chapter05/glibc.xml
index ddf284375..4ef95147f 100644
--- a/chapter05/glibc.xml
+++ b/chapter05/glibc.xml
@@ -55,9 +55,11 @@ cd ../glibc-build</userinput></screen>
     the flag is best placed inside the build variable <quote>CFLAGS</quote>.
     Instead of overriding completely what Glibc's internal build system uses
     for CFLAGS, append the new flag to the existing contents of CFLAGS by
-    making use of the special file <filename>configparms</filename>:</para>
+    making use of the special file <filename>configparms</filename>. The
+    -mtune=native flag is also necessary to reset a reasonable value for -mtune
+    that is changed when setting -march.</para>
 
-<screen><userinput remap="configure">echo "CFLAGS += -march=i486" &gt; configparms</userinput></screen>
+<screen><userinput remap="configure">echo "CFLAGS += -march=i486 -mtune=native" &gt; configparms</userinput></screen>
 
     <para>Next, prepare Glibc for compilation:</para>
 
-- 
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