ncurses: Modify the header to always use the ABI of ncursesw

instead of the 8-bit ncurses.

We don't provide the 8-bit ncurses library and we are "faking" it using
ncursesw.  Thus innocent package may be compiled with the 8-bit ABI
(because it does not know what we are doing and so it does not use
the "expected" preprocessor definitions to enable the wide ABI) but
linked against ncursesw, causing a potential ABI mismatch.

chapter01/changelog.xml

@@ -40,6 +40,18 @@
     appropriate for the entry or if needed the entire day's listitem.
     -->
 
+    <listitem>
+      <para>2024-01-18</para>
+      <itemizedlist>
+        <listitem>
+          <para>[xry111] - Edit a ncurses header to always use the
+          wide-character ABI compatible with libncursesw.so because we
+          are faking the 8-bit libncurses.so with it.  Fixes
+          <ulink url="&lfs-ticket-root;5415">#5415</ulink>.</para>
+        </listitem>
+      </itemizedlist>
+    </listitem>
+
     <listitem>
       <para>2024-01-09</para>
       <itemizedlist>

chapter06/ncurses.xml

@@ -156,7 +156,9 @@ popd</userinput></screen>
     <para>Install the package:</para>
 
 <screen><userinput remap="install">make DESTDIR=$LFS TIC_PATH=$(pwd)/build/progs/tic install
-echo "INPUT(-lncursesw)" > $LFS/usr/lib/libncurses.so</userinput></screen>
+echo "INPUT(-lncursesw)" > $LFS/usr/lib/libncurses.so
+sed -e 's/^#if.*XOPEN.*$/#if 1/' \
+    -i $LFS/usr/include/curses.h</userinput></screen>
 <!--
     <para>Remove an unneeded static library not handled by
     <command>configure</command>:</para>
@@ -185,6 +187,23 @@ echo "INPUT(-lncursesw)" > $LFS/usr/lib/libncurses.so</userinput></screen>
         </listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><command>sed -e 's/^#if.*XOPEN.*$/#if 1/' ...</command></term>
+        <listitem>
+          <para>The header file <filename>curses.h</filename> contains
+          the definition of various Ncurses data structures.  With different
+          preprocessor macro definitions two different sets of the data
+          structure definition may be used: the 8-bit definition is
+          compatible with <filename>libncurses.so</filename> and the
+          wide-character definition is compatible with
+          <filename>libncursesw.so</filename>.  Since we are using
+          <filename>libncursesw.so</filename> as a replacement of
+          <filename>libncurses.so</filename>, edit the header file so it
+          will always use the wide-character data structure definition
+          compatible with <filename>libncursesw.so</filename>.</para>
+        </listitem>
+      </varlistentry>
+
     </variablelist>
 
   </sect2>

chapter08/ncurses.xml

@@ -131,11 +131,16 @@
     in-place.  It may crash the shell process which is using code and data
     from the library file.  Install the package with
     <literal>DESTDIR</literal>, and replace the library file correctly using
-    <command>install</command> command:</para>
+    <command>install</command> command (the header
+    <filename>curses.h</filename> is also edited to ensure the
+    wide-character ABI to be used as what we've done in
+    <xref linkend='ch-tools-ncurses'/>):</para>
 
 <screen><userinput remap="install">make DESTDIR=$PWD/dest install
 install -vm755 dest/usr/lib/libncursesw.so.&ncurses-version; /usr/lib
 rm -v  dest/usr/lib/libncursesw.so.&ncurses-version;
+sed -e 's/^#if.*XOPEN.*$/#if 1/' \
+    -i dest/usr/include/curses.h
 cp -av dest/* /</userinput></screen>
 
     <para>Many applications still expect the linker to be able to find