dhcp-4.4.1: Avoid compile error with new gcc by exporting CFLAGS.

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@20561 af4574ff-66df-0310-9fd7-8a98e5e911e0

introduction/welcome/changelog.xml

@@ -45,6 +45,11 @@
     <listitem>
       <para>October 3rd, 2018</para>
       <itemizedlist>
+        <listitem>
+          <para>[thomas] - Export CFLAGS in dhcp to avoid a compile error caused 
+             by new versions of gcc. Fixes 
+             <ulink url="&blfs-ticket-root;11199">#11199</ulink>.</para>
+        </listitem>
         <listitem>
           <para>[thomas] - Use stable branch (9.12.2-P2) for bind and bind-utils.
              Fixes <ulink url="&blfs-ticket-root;11166">#11166</ulink>.</para>

networking/connect/dhcp.xml

@@ -152,7 +152,12 @@
       the following commands:
     </para>
 
-<screen><userinput>CFLAGS="-D_PATH_DHCLIENT_SCRIPT='\"/sbin/dhclient-script\"'         \
+<!--
+   Running ( export CFLAGS=... ./configure ... ) in a subshell
+   preserves CFLAGS if they are set in environment
+-->
+<screen><userinput>( export CFLAGS="$CFLAGS -Wall -fno-strict-aliasing                 \
+        -D_PATH_DHCLIENT_SCRIPT='\"/sbin/dhclient-script\"'         \
         -D_PATH_DHCPD_CONF='\"/etc/dhcp/dhcpd.conf\"'               \
         -D_PATH_DHCLIENT_CONF='\"/etc/dhcp/dhclient.conf\"'"        &amp;&amp;
 
@@ -162,7 +167,8 @@
             --with-srv-lease-file=/var/lib/dhcpd/dhcpd.leases       \
             --with-srv6-lease-file=/var/lib/dhcpd/dhcpd6.leases     \
             --with-cli-lease-file=/var/lib/dhclient/dhclient.leases \
-            --with-cli6-lease-file=/var/lib/dhclient/dhclient6.leases &amp;&amp;
+            --with-cli6-lease-file=/var/lib/dhclient/dhclient6.leases
+) &amp;&amp;
 make -j1</userinput></screen>
 
     <para>