Add remarks about .la files telling that they are potentially harmful

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11815 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter05/stripping.xml

@@ -31,7 +31,10 @@
 
 <screen><userinput>rm -rf /tools/{,share}/{info,man,doc}</userinput></screen>
 
-  <para>Remove unneeded files:</para>
+  <para>The libtool .la files are only useful when linking with static
+  libraries. They are unneeded, and potentially harmful, when using dynamic
+  shared libraries, specially when using also non-autotools build systems.
+  Remove those files now:</para>
 
 <screen><userinput>find /tools/{lib,libexec} -name \*.la -delete</userinput></screen>
 

chapter06/revisedchroot.xml

@@ -59,8 +59,10 @@ rm -f /usr/lib/libz.a</userinput></screen>
 
   <para>There are also several files installed in the /usr/lib and /usr/libexec
   directories with a file name extention of .la. These are "libtool archive"
-  files and generally unneeded on a linux system. None of these are necessary
-  at this point. To remove them, run:</para>
+  files. As already said, they are only useful when linking with static
+  libraries. They are unneeded, and potentially harmful, when using dynamic
+  shared libraries, specially when using also non-autotools build systems.
+  To remove them, run:</para>
 
 <screen><userinput>find /usr/lib /usr/libexec -name \*.la -delete</userinput></screen>