ref-manual: Updates to ELF binary QA warning

Fixes [YOCTO #7630]

Apparently the text relocation being done here can cause runtime
performance issues.  I documented a potential work-around for the
issue and provided a cross-reference link to an external site for
more general information about text relocation at runtime.

Reported-by: Laszlo Papp <lpapp@kde.org>
(From yocto-docs rev: f7ba2fd03ee40c5dbe6a07a24a63d9147857ed78)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 15 insertions, 1 deletions

diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index a000b2ae28..3889473b6e 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1697,7 +1697,11 @@
             <listitem><para><emphasis><filename>textrel:</filename></emphasis>
                 Checks for ELF binaries that contain relocations in their
                 <filename>.text</filename> sections, which can result in a
-                performance impact at runtime.</para></listitem>
+                performance impact at runtime.
+                See the explanation for the
+                <link linkend='qa-issue-textrel'><filename>ELF binary</filename></link>
+                message for more information regarding runtime performance issues.
+                </para></listitem>
             <listitem><para><emphasis><filename>unsafe-references-in-binaries:</filename></emphasis>
                 Reports when a binary installed in
                 <filename>${base_libdir}</filename>,
diff --git a/documentation/ref-manual/ref-qa-checks.xml b/documentation/ref-manual/ref-qa-checks.xml
index 43cb26db4c..b4657e2ced 100644
--- a/documentation/ref-manual/ref-qa-checks.xml
+++ b/documentation/ref-manual/ref-qa-checks.xml
@@ -464,6 +464,16 @@ can be found then it should be implemented.  I can't find one at the moment.
                     <filename>.text</filename> sections.
                     This situation can result in a performance impact
                     at runtime.
+                    <note><title>Tip</title>
+                       If you do experience runtime performance issues,
+                       you could try assigning "-fPIC/-fpic" to
+                       <filename>gcc</filename>.
+                    </note>
+                </para>
+
+                <para>
+                    For more information on text relocations at runtime, see
+                    <ulink url='http://www.akkadia.org/drepper/textrelocs.html'></ulink>.
                 </para>
 
                 <para>