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diff -up ltrace-0.7.91/options.c\~ ltrace-0.7.91/options.c
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--- ltrace-0.7.91/options.c~ 2013-10-22 11:54:21.000000000 +0200
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+++ ltrace-0.7.91/options.c 2014-01-13 15:38:51.362221740 +0100
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@@ -128,6 +128,8 @@ usage_debug(void) {
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"\n"
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"Debugging options are mixed using bitwise-or.\n"
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"Note that the meanings and values are subject to change.\n"
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+ "Also note that these values are used inconsistently in ltrace, and the\n"
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+ "only debuglevel that you can rely on is -D77 that will show everything.\n"
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);
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}
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diff -up ltrace-0.7.91/ltrace.1\~ ltrace-0.7.91/ltrace.1
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--- ltrace-0.7.91/ltrace.1~ 2013-10-23 17:44:13.000000000 +0200
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+++ ltrace-0.7.91/ltrace.1 2014-01-13 15:51:24.236730677 +0100
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@@ -1,5 +1,5 @@
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.\" -*-nroff-*-
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-.\" Copyright (c) 2012, 2013 Petr Machata, Red Hat Inc.
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+.\" Copyright (c) 2012,2013,2014 Petr Machata, Red Hat Inc.
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.\" Copyright (c) 1997-2005 Juan Cespedes <cespedes@debian.org>
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.\"
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.\" This program is free software; you can redistribute it and/or
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@@ -118,9 +118,9 @@ Besides removing any initial underscore
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this makes C++ function names readable.
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.IP "\-D, \-\-debug \fRmask\fI"
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Show debugging output of \fBltrace\fR itself. \fImask\fR is a number
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-with internal meaning that's not really well defined at all.
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-\fImask\fR of 77 shows all debug messages, which is what you usually
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-need.
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+describing which debug messages should be displayed. Use the option
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+\-Dh to see what can be used, but note that currently the only
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+reliable debugmask is 77, which shows all debug messages.
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.IP "\-e \fIfilter"
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A qualifying expression which modifies which library calls to trace.
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The format of the filter expression is described in the section
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@@ -156,7 +156,8 @@ dependency ordering. If you want to mak
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library are actually called, use \fB-x @\fIlibrary_pattern\fR instead.
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.IP \-L
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When no -e option is given, don't assume the default action of
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-\fB@MAIN\fR.
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+\fB@MAIN\fR. In practice this means that library calls will not be
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+traced.
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.IP "\-n, \-\-indent \fInr"
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Indent trace output by \fInr\fR spaces for each level of call
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nesting. Using this option makes the program flow visualization easy
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