Simplified the glibc-lockin for chapter 5, and added some verbiage on fixincludes

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2708 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter01/changelog.xml

@@ -82,6 +82,11 @@
 </itemizedlist>
 </para></listitem>
 
+<listitem><para>August 31, 2003 [jeremy] - Added in Greg's new 
+instructions for GCC 3.3.1 wrt the fixincludes process.  Also added
+extra verbiage to the lockin and GCC pass 2 pages on the fixincludes
+process.</para></listitem>
+
 <listitem><para>August 31, 2003 [jeremy] - Added user nobody to 
 passwd and group files, so coreutils tests will pass.</para></listitem>
 

chapter05/gcc-pass2-inst.xml

@@ -12,6 +12,17 @@ subdir.</para>
 <para><screen><userinput>patch -Np1 -i ../gcc-&gcc-version;-no_fixincludes-2.patch
 patch -Np1 -i ../gcc-&gcc-specs-version;.patch</userinput></screen></para>
 
+<para>The first patch disables the GCC "fixincludes" script.  We mentioned this
+briefly earlier, but a slightly more in-depth explanation of the fixincludes 
+process is warranted here.  Under normal circumstances, the GCC fixincludes
+script scans your system for header files that need to be fixed.  It might find
+that the Glibc header files on your host system need to be fixed, fix them and
+put them in the GCC private include directory.  Then, later on in Chapter 6,
+after we've installed the newer Glibc, this private include directory would be
+searched before the system include directory, resulting in GCC finding the
+fixed headers from the host system, which would most likely not match the Glibc
+version actually used for the LFS system.</para>
+
 <para>The last patch changes GCC's default location of the dynamic linker,
 a simple substitution of "/lib/ld-linux.so.2" with "/stage1/lib/ld-linux.so.2"
 in <filename>config/i386/linux.h</filename>. Patching now rather than adjusting

chapter05/lockingglibc.xml

@@ -35,17 +35,13 @@ unset SPECFILE</userinput></screen></para>
 it all in. Or you can edit the specs file by hand if you want to: just replace
 "/lib/ld-linux.so.2" with "/stage1/lib/ld-linux.so.2".</para>
 
-<para>Also, because we allowed GCC's "Fixincludes" script to modify our host's
-header files (and this was necessary because of improper use of the __thread
-keyword in some older software), we want to get rid of those modified header
-files, and replace them with pristine ones.</para>
-
-<para><screen><userinput>GCCDIR=/stage1/lib/gcc-lib/*/*
-rm -rf $GCCDIR/include/*
-cp $GCCDIR/install-tools/include/* $GCCDIR/include
-cp $GCCDIR/install-tools/gsyslimits.h \
-   $GCCDIR/include/syslimits.h
-unset GCCDIR</userinput></screen></para>
+<para>Lastly, there is a possibility that some include files from the host
+system have found their way into gcc's private include dir. This can happen
+because of GCC's "fixincludes" process which part of the GCC build. We'll
+explain more about this further on in this chapter.  For now, run the
+following commands to eliminate this possibility.</para>
+
+<para><screen><userinput>rm -f /stage1/lib/gcc-lib/*/*/include/{pthread.h,bits/sigthread.h}</userinput></screen></para>
 
 <para>This completes the installation of the self-contained toolchain, which
 can now be used to build the rest of the temporary tools.</para>