Changeset 1c6f1c1

Timestamp:

04/23/2008 06:33:53 PM (16 years ago)

Author:

Jeremy Huntwork <jhuntwork@…>

Branches:

10.0, 10.0-rc1, 10.1, 10.1-rc1, 11.0, 11.0-rc1, 11.0-rc2, 11.0-rc3, 11.1, 11.1-rc1, 11.2, 11.2-rc1, 11.3, 11.3-rc1, 12.0, 12.0-rc1, 12.1, 12.1-rc1, 6.4, 6.5, 6.6, 6.7, 6.8, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.5-systemd, 7.6, 7.6-systemd, 7.7, 7.7-systemd, 7.8, 7.8-systemd, 7.9, 7.9-systemd, 8.0, 8.1, 8.2, 8.3, 8.4, 9.0, 9.1, arm, bdubbs/gcc13, ml-11.0, multilib, renodr/libudev-from-systemd, s6-init, trunk, xry111/arm64, xry111/arm64-12.0, xry111/clfs-ng, xry111/lfs-next, xry111/loongarch, xry111/loongarch-12.0, xry111/loongarch-12.1, xry111/mips64el, xry111/pip3, xry111/rust-wip-20221008, xry111/update-glibc

Children:

61e63d3

Parents:

0fcbd17

Message:

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

Files:

• chapter01/changelog.xml (modified) (1 diff)
• chapter05/glibc.xml (modified) (1 diff)
• chapter06/glibc.xml (modified) (1 diff)

chapter01/changelog.xml

@@ -40 +40 @@
       <para>2008-04-23</para>
       <itemizedlist>
+        <listitem>
+          <para>[jhuntwork] - Use -mtune=native for glibc. We don't
+          want our libc optimized for 486. It should be optimized
+          for the local machine.</para>
+        </listitem>
         <listitem>
           <para>[jhuntwork] - Updated Autoconf to 2.62.</para>

chapter05/glibc.xml

@@ -56 +56 @@
     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>
-
-<screen><userinput remap="configure">echo "CFLAGS += -march=i486" &gt; configparms</userinput></screen>
+    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 -mtune=native" &gt; configparms</userinput></screen>
 
     <para>Next, prepare Glibc for compilation:</para>

chapter06/glibc.xml

@@ -105 +105 @@
     <para>Again, add the needed compiler flag to CFLAGS:</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>Prepare Glibc for compilation:</para>