binutils: Add --enable-new-dtags

This option makes ld use DT_RUNPATH instead of DT_RPATH.  DT_RPATH is
generally considered bad because it takes precedence over
LD_LIBRARY_PATH.  For example, eog is linked with -rpath /usr/lib/eog,
and with DT_RPATH if an old eog is already installed we are basically
impossible to debug a new eog build w/o overwriting the system
installation first or explicitly using "ld.so --inhibit-rpath" to
invoke it.

This "new" actually means "new in 2000," it's 24 years ago and all other
distros has enabled it.  Thus I guess some unexplainable "test suite
uses installed library instead of the just built one" issues in BLFS are
actually caused by this difference: the package author just assumes
everyone is using DT_RUNPATH thus they just set LD_LIBRARY_PATH and
consider it enough to test with the just built libraries, but DT_RPATH
breaks this expectation.

Let's eliminate the difference as it seems not doing anything good and
doing so just takes one switch.

chapter05/binutils-pass1.xml

@@ -76,6 +76,7 @@ cd       build</userinput></screen>
              --disable-nls       \
              --enable-gprofng=no \
              --disable-werror    \
+             --enable-new-dtags  \
              --enable-default-hash-style=gnu</userinput></screen>
 
     <variablelist>
@@ -133,6 +134,17 @@ cd       build</userinput></screen>
         </listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><parameter>--enable-new-dtags</parameter></term>
+        <listitem>
+          <para>This makes the linker use the <quote>runpath</quote> tag for
+          embedding library search paths into executables and shared libraries,
+          instead of the traditional <quote>rpath</quote> tag.  It makes
+          debugging dynamically linked executables easier and works around
+          potential issues in the test suite of some packages.</para>
+        </listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><parameter>--enable-default-hash-style=gnu</parameter></term>
         <listitem>

chapter06/binutils-pass2.xml

@@ -73,6 +73,7 @@ cd       build</userinput></screen>
     --enable-gprofng=no        \
     --disable-werror           \
     --enable-64-bit-bfd        \
+    --enable-new-dtags         \
     --enable-default-hash-style=gnu</userinput></screen>
 
     <variablelist>

chapter08/binutils.xml

@@ -57,6 +57,7 @@ cd       build</userinput></screen>
              --enable-shared     \
              --disable-werror    \
              --enable-64-bit-bfd \
+             --enable-new-dtags  \
              --with-system-zlib  \
              --enable-default-hash-style=gnu</userinput></screen>