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Correct bootstrap explanation in gcc sections. Thanks to Chris Staub.

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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8883 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
This commit is contained in:
Bruce Dubbs 2009-05-17 03:20:56 +00:00
parent fddfb52082
commit 07312f6eec
3 changed files with 23 additions and 13 deletions
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6
chapter01/changelog.xml
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@ -40,6 +40,12 @@
<listitem>
<para>2009-05-16</para>
<itemizedlist>
<listitem>
<para>[bdubbs] - Update gcc instruction explanations.
Thanks to Chris Staub for the patch.
Fixes
<ulink url="&lfs-ticket-root;2363">#2363</ulink>.</para>
</listitem>
<listitem>
<para>[bdubbs] - Add an explanation about using the barrier
option in fstab.

20
chapter05/gcc-pass2.xml
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@ -66,10 +66,11 @@
<screen><userinput remap="pre">cp -v gcc/Makefile.in{,.orig}
sed 's@\./fixinc\.sh@-c true@' gcc/Makefile.in.orig &gt; gcc/Makefile.in</userinput></screen>
<para>Non-bootstrap builds omit the <option>-fomit-frame-pointer</option>
build flag by default, and the goal should be to produce a compiler that is
exactly the same as if it were bootstrapped. Apply the following
<command>sed</command> command to force the build to use the flag:</para>
<para>For x86 machines, a bootstrap build of GCC uses the
<option>-fomit-frame-pointer</option> compiler flag. Non-bootstrap builds
omit this flag by default, and the goal should be to produce a compiler
that is exactly the same as if it were bootstrapped. Apply the following
<command>sed</command> command to force the build to use the flag:</para>
<screen><userinput remap="pre">cp -v gcc/Makefile.in{,.tmp}
sed 's/^XCFLAGS =$/&amp; -fomit-frame-pointer/' gcc/Makefile.in.tmp \
@ -209,9 +210,14 @@ cd ../gcc-build</userinput></screen>
<varlistentry>
<term><parameter>--disable-bootstrap</parameter></term>
<listitem>
<para>Bootstrapping the compiler is now the default for GCC. However,
our build method should provide us with a solid compiler without the
need to bootstrap each time.</para>
<para>For native builds of GCC, the default is to a "bootstrap" build.
This does not just compile GCC, but compiles it several times. It
uses the programs compiled in a first round to compile itself a
second time, and then again a third time. The second and third
iterations are compared to make sure it can reproduce itself
flawlessly. This also implies that it was compiled correctly.
However, the LFS build method should provide a solid compiler
without the need to bootstrap each time.</para>
</listitem>
</varlistentry>

10
chapter06/gcc.xml
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@ -48,12 +48,10 @@
<screen><userinput remap="pre">sed -i 's/install_to_$(INSTALL_DEST) //' libiberty/Makefile.in</userinput></screen>
<para>For x86 machines, the bootstrap build performed in
<xref linkend="ch-tools-gcc-pass2"/>
built GCC with the <option>-fomit-frame-pointer</option> compiler flag.
Non-bootstrap builds omit this flag by default, so apply the following
<command>sed</command> to use it in order to ensure consistent compiler
builds:</para>
<para>As in <xref linkend="ch-tools-gcc-pass2"/>, apply the following
<command>sed</command> to force the build to use the
<option>-fomit-frame-pointer</option> compiler flag in order to ensure
consistent compiler builds:</para>
<screen><userinput remap="pre">case `uname -m` in
i?86) sed -i 's/^XCFLAGS =$/&amp; -fomit-frame-pointer/' \