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Add some notes about DEBUG flag 

llvm-svn: 4624
This commit is contained in:
Chris Lattner 2002-11-08 06:50:02 +00:00
parent 05788d4b82
commit 7522da4fa7
1 changed files with 10 additions and 3 deletions
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13
llvm/docs/ProgrammersManual.html
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@ -349,8 +349,15 @@ Then you can run your pass like this:<p>
Using the <tt>DEBUG()</tt> macro instead of a home brewed solution allows you to
now have to create "yet another" command line option for the debug output for
your pass. Note that <tt>DEBUG()</tt> macros are disabled for optimized
builds, so they do not cause a performance impact at all.<p>
your pass. Note that <tt>DEBUG()</tt> macros are disabled for optimized builds,
so they do not cause a performance impact at all (for the same reason, they
should also not contain side-effects!).<p>
One additional nice thing about the <tt>DEBUG()</tt> macro is that you can
enable or disable it directly in gdb. Just use "<tt>set DebugFlag=0</tt>" or
"<tt>set DebugFlag=1</tt>" from the gdb if the program is running. If the
program hasn't been started yet, you can always just run it with
<tt>-debug</tt>.<p>
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@ -1769,6 +1776,6 @@ pointer to the parent Function.
<a href="mailto:sabre@nondot.org">Chris Lattner</a></address>
<!-- Created: Tue Aug 6 15:00:33 CDT 2002 -->
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Last modified: Sun Oct 20 21:37:06 CDT 2002
Last modified: Fri Nov 8 00:48:37 CST 2002
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