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RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.8/changes.html,v
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<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