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Use -mtune=native for glibc. We don't want our libc optimized for 486.

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It should be optimized for the local machine.


git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8541 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
This commit is contained in:
Jeremy Huntwork 2008-04-23 18:33:53 +00:00
parent 0fcbd17115
commit 1c6f1c1e41
3 changed files with 10 additions and 3 deletions
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5
chapter01/changelog.xml
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@ -39,6 +39,11 @@
<listitem> <listitem>
<para>2008-04-23</para> <para>2008-04-23</para>
<itemizedlist> <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> <listitem>
<para>[jhuntwork] - Updated Autoconf to 2.62.</para> <para>[jhuntwork] - Updated Autoconf to 2.62.</para>
</listitem> </listitem>

6
chapter05/glibc.xml
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@ -55,9 +55,11 @@ cd ../glibc-build</userinput></screen>
the flag is best placed inside the build variable <quote>CFLAGS</quote>. the flag is best placed inside the build variable <quote>CFLAGS</quote>.
Instead of overriding completely what Glibc's internal build system uses Instead of overriding completely what Glibc's internal build system uses
for CFLAGS, append the new flag to the existing contents of CFLAGS by 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> <para>Next, prepare Glibc for compilation:</para>

2
chapter06/glibc.xml
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@ -104,7 +104,7 @@ cd ../glibc-build</userinput></screen>
<para>Again, add the needed compiler flag to CFLAGS:</para> <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> <para>Prepare Glibc for compilation:</para>