Update comments about gcc and bison tests

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11293 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/bison.xml

@@ -60,7 +60,8 @@
 
     <para>There is a circular dependency between bison and flex with regard to
     the checks.  If desired, after installing flex in the next section, the
-    bison checks can be run with <command>make check</command>.</para>
+    bison checks can be run with <command>make check</command>.  Three
+    tests related to lalr1.cc fail for unknown reasons.</para>
 
     <para>Install the package:</para>
 

chapter06/gcc.xml

@@ -131,6 +131,14 @@ cd       build</userinput></screen>
     Unless the test results are vastly different from those at the above URL,
     it is safe to continue.</para>
 
+    <note><para>
+      On some combinations of kernel configuration and AMD processors
+      there may be more than 1100 failures in the gcc.target/i386/mpx
+      tests (which are designed to test the MPX option on recent
+      Intel processors). These can safely be ignored on AMD
+      processors.
+    </para></note>
+
     <para>Install the package:</para>
 
 <screen><userinput remap="install">make install</userinput></screen>