Add some clarifying text re test suites.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2912 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter05/binutils-pass2-inst.xml

@@ -33,7 +33,8 @@ variables that override the default optimization flags.</para>
 
 <para><screen><userinput>make </userinput></screen></para>
 
-<para>Test the results (nothing should fail here):</para>
+<para>Test the results (there should be no unexpected failures here, expected
+failures are fine):</para>
 
 <para><screen><userinput>make check</userinput></screen></para>
 

chapter05/gcc-pass2-inst.xml

@@ -131,7 +131,7 @@ current GCC-3.3.1 should look on i686-pc-linux-gnu, see
 <para>Note that the results contain:</para>
 
 <screen>* 1 XPASS (unexpected pass) for g++
-* 1 FAIL for g++
+* 1 FAIL (unexpected failure) for g++
 * 2 FAIL for gcc
 * 26 XPASS's for libstdc++</screen>
  
@@ -148,6 +148,11 @@ model (which may be applicable if for instance you were using Newlibc, Sun-libc
 or whatever libc). The libstdc++ test suite is apparently expecting the
 "generic" model, hence those tests are not always expected to pass.</para>
 
+<para>Unexpected failures often cannot be avoided. The GCC developers are
+usually aware of them but haven't yet gotten around to fixing them. In short,
+unless your results are vastly different from those at the above URL, it is safe
+to continue on.</para>
+
 <para>And finally install the package:</para>                                              
 
 <para><screen><userinput>make install</userinput></screen></para>