Changes in chapter08/gmp.xml [5adc76b:be5b2e0]

File:

• chapter08/gmp.xml (modified) (2 diffs)

chapter08/gmp.xml

@@ -43 +43 @@
 
     <note>
+      <para>If you are building for 32-bit x86, but you have a CPU which is
+      capable of running 64-bit code <emphasis>and</emphasis> you have specified
+      <envar>CFLAGS</envar> in the environment, the configure script will
+      attempt to configure for 64-bits and fail.
+      Avoid this by invoking the configure command below with
+<screen role="nodump"><userinput><parameter>ABI=32</parameter> ./configure ...</userinput></screen></para>
+    </note>
+
+    <note>
       <para>The default settings of GMP produce libraries optimized for
       the host processor.  If libraries suitable for processors less
       capable than the host's CPU are desired, generic libraries can be
-      created by running the following:
+      created by appending the <option>--host=none-linux-gnu</option> option
+      to the <command>configure</command> command.</para>
 
-<screen role="nodump"><userinput>cp -v configfsf.guess config.guess
-cp -v configfsf.sub   config.sub</userinput></screen></para>
+      <!-- To editors: the configure script says "the none host is obsolete,
+           use - -disable-assembly", but don't believe it: with the latter
+           CFLAGS is still automatically set to -march=something.  -->
     </note>
 
@@ -98 +109 @@
     applications using the gmp libraries with the message "Illegal
     instruction".  In this case, gmp should be reconfigured with the option
-    --build=aarch64-unknown-linux-gnu and rebuilt.</para></caution>
+    <option>--host=none-linux-gnu</option> and rebuilt.</para></caution>
 
-    <para>Ensure that all 197 tests in the test suite passed.
+    <para>Ensure that all 199 tests in the test suite passed.
     Check the results by issuing the following command:</para>