From patchwork Wed Nov 21 10:13:47 2012
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Subject: [www-docs] Add note to gcc-4.8/changes.html that DWARF4 is now the
 default.
From: Mark Wielaard <mjw@redhat.com>
X-Patchwork-Id: 200622
Message-Id: <1353492827.2476.3.camel@springer.wildebeest.org>
To: gcc-patches@gcc.gnu.org
Date: Wed, 21 Nov 2012 11:13:47 +0100

As mentioned in some bug reports it should be documented that DWARF4 is
now the default for 4.8 when -g is used (and that one might need a newer
version of debugger/profiling/tracing tools to use it). So I added the
following:


Index: htdocs/gcc-4.8/changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.8/changes.html,v
retrieving revision 1.61
diff -u -r1.61 changes.html
--- htdocs/gcc-4.8/changes.html	20 Nov 2012 19:49:00 -0000	1.61
+++ htdocs/gcc-4.8/changes.html	21 Nov 2012 10:07:59 -0000
@@ -53,6 +53,15 @@
 <h2>General Optimizer Improvements (and Changes)</h2>
 
   <ul>
+    <li>DWARF4 is now the default when generating DWARF debug information.
+      When -g is used on a platform that uses DWARF debugging information,
+      GCC will now default to -gdwarf-4 -fno-debug-types-section.
+      GDB 7.5, Valgrind 3.8.0 and elfutils 0.154 debug information consumers
+      support DWARF4 by default. Before GCC 4.8 the default version used
+      was DWARF2. To make GCC 4.8 generate an older DWARF version use -g
+      together with -gdwarf-2 or -gdwarf-3. The default for Darwin and
+      VxWorks is still -g-dwarf2 -gstrict-dwarf.
+    </li>
     <li>A new general optimization level, <code>-Og</code>, has been
       introduced.  It addresses the need for fast compilation and a
       superior debugging experience while providing a reasonable level