From 07312f6eec9cd6e0f5581bbf5720c8416cea70f2 Mon Sep 17 00:00:00 2001
From: Bruce Dubbs <bdubbs@linuxfromscratch.org>
Date: Sun, 17 May 2009 03:20:56 +0000
Subject: Correct bootstrap explanation in gcc sections.  Thanks to Chris
 Staub.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8883 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
---
 chapter05/gcc-pass2.xml | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

(limited to 'chapter05')

diff --git a/chapter05/gcc-pass2.xml b/chapter05/gcc-pass2.xml
index 75bca7092..b60c5c00a 100644
--- a/chapter05/gcc-pass2.xml
+++ b/chapter05/gcc-pass2.xml
@@ -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>
 
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