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author | Roland Pesch <pesch@cygnus> | 1991-05-23 00:14:26 +0000 |
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committer | Roland Pesch <pesch@cygnus> | 1991-05-23 00:14:26 +0000 |
commit | 9bcc06ef1645086025bd7a5ecbe423f7fc1d6fc8 (patch) | |
tree | e0110d4fdb8b91b4e49dbd9029e42a458ca02dfc /gdb/doc/gdb.bugs-m4 | |
parent | 5ad1d8304204d3e81726319bf7262e571156f9da (diff) | |
download | gdb-9bcc06ef1645086025bd7a5ecbe423f7fc1d6fc8.zip gdb-9bcc06ef1645086025bd7a5ecbe423f7fc1d6fc8.tar.gz gdb-9bcc06ef1645086025bd7a5ecbe423f7fc1d6fc8.tar.bz2 |
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diff --git a/gdb/doc/gdb.bugs-m4 b/gdb/doc/gdb.bugs-m4 new file mode 100755 index 0000000..88ac09f --- /dev/null +++ b/gdb/doc/gdb.bugs-m4 @@ -0,0 +1,221 @@ +_dnl__ Copyright (c) 1990 1991 Free Software Foundation, Inc. +_dnl__ This file is part of the source for the GDB manual. +_dnl__ $Id$ +@node _GDBN__ Bugs, Renamed Commands, Emacs, Top +@chapter Reporting Bugs in _GDBN__ +@cindex Bugs in _GDBN__ +@cindex Reporting Bugs in _GDBN__ + +Your bug reports play an essential role in making _GDBN__ reliable. + +Reporting a bug may help you by bringing a solution to your problem, or it +may not. But in any case the principal function of a bug report is to help +the entire community by making the next version of _GDBN__ work better. Bug +reports are your contribution to the maintenance of _GDBN__. + +In order for a bug report to serve its purpose, you must include the +information that enables us to fix the bug. + +@menu +* Bug Criteria:: Have You Found a Bug? +* Bug Reporting:: How to Report Bugs +@end menu + +@node Bug Criteria, Bug Reporting, _GDBN__ Bugs, _GDBN__ Bugs +@section Have You Found a Bug? +@cindex Bug Criteria + +If you are not sure whether you have found a bug, here are some guidelines: + +@itemize @bullet +@item +@cindex Fatal Signal +@cindex Core Dump +If the debugger gets a fatal signal, for any input whatever, that is a +_GDBN__ bug. Reliable debuggers never crash. + +@item +@cindex error on Valid Input +If _GDBN__ produces an error message for valid input, that is a bug. + +@item +@cindex Invalid Input +If _GDBN__ does not produce an error message for invalid input, +that is a bug. However, you should note that your idea of +``invalid input'' might be our idea of ``an extension'' or ``support +for traditional practice''. + +@item +If you are an experienced user of debugging tools, your suggestions +for improvement of _GDBN__ are welcome in any case. +@end itemize + +@node Bug Reporting, , Bug Criteria, _GDBN__ Bugs +@section How to Report Bugs +@cindex Bug Reports +@cindex Compiler Bugs, Reporting + +A number of companies and individuals offer support for GNU products. +If you obtained _GDBN__ from a support organization, we recommend you +contact that organization first. + +Contact information for many support companies and individuals is +available in the file @file{etc/SERVICE} in the GNU Emacs distribution. + +In any event, we also recommend that you send bug reports for _GDBN__ to one +of these addresses: + +@example +bug-gdb@@prep.ai.mit.edu +@{ucbvax|mit-eddie|uunet@}!prep.ai.mit.edu!bug-gdb +@end example + +@strong{Do not send bug reports to @samp{info-gdb}, or to +@samp{help-gdb}, or to any newsgroups.} Most users of _GDBN__ do not want to +receive bug reports. Those that do, have arranged to receive @samp{bug-gdb}. + +The mailing list @samp{bug-gdb} has a newsgroup which serves as a +repeater. The mailing list and the newsgroup carry exactly the same +messages. Often people think of posting bug reports to the newsgroup +instead of mailing them. This appears to work, but it has one problem +which can be crucial: a newsgroup posting often lacks a mail path +back to the sender. Thus, if we need to ask for more information, we +may be unable to reach you. For this reason, it is better to send bug +reports to the mailing list. + +As a last resort, send bug reports on paper to: + +@example +GNU Debugger Bugs +545 Tech Square +Cambridge, MA 02139 +@end example + +The fundamental principle of reporting bugs usefully is this: +@strong{report all the facts}. If you are not sure whether to state a +fact or leave it out, state it! + +Often people omit facts because they think they know what causes the +problem and assume that some details don't matter. Thus, you might +assume that the name of the variable you use in an example does not matter. +Well, probably it doesn't, but one cannot be sure. Perhaps the bug is a +stray memory reference which happens to fetch from the location where that +name is stored in memory; perhaps, if the name were different, the contents +of that location would fool the debugger into doing the right thing despite +the bug. Play it safe and give a specific, complete example. That is the +easiest thing for you to do, and the most helpful. + +Keep in mind that the purpose of a bug report is to enable us to fix +the bug if it is new to us. It isn't as important what happens if +the bug is already known. Therefore, always write your bug reports on +the assumption that the bug has not been reported previously. + +Sometimes people give a few sketchy facts and ask, ``Does this ring a +bell?'' Those bug reports are useless, and we urge everyone to +@emph{refuse to respond to them} except to chide the sender to report +bugs properly. + +To enable us to fix the bug, you should include all these things: + +@itemize @bullet +@item +The version of _GDBN__. _GDBN__ announces it if you start with no +arguments; you can also print it at any time using @code{show version}. + +Without this, we won't know whether there is any point in looking for +the bug in the current version of _GDBN__. + +@item +A complete input script, and all necessary source files, that will +reproduce the bug. + +@item +What compiler (and its version) was used to compile _GDBN__---e.g. +``_GCC__-1.37.1''. + +@item +The command arguments you gave the compiler to compile your example and +observe the bug. For example, did you use @samp{-O}? To guarantee +you won't omit something important, list them all. + +If we were to try to guess the arguments, we would probably guess wrong +and then we might not encounter the bug. + +@item +The type of machine you are using, and the operating system name and +version number. + +@item +A description of what behavior you observe that you believe is +incorrect. For example, ``It gets a fatal signal.'' + +Of course, if the bug is that _GDBN__ gets a fatal signal, then we will +certainly notice it. But if the bug is incorrect output, we might not +notice unless it is glaringly wrong. We are human, after all. You +might as well not give us a chance to make a mistake. + +Even if the problem you experience is a fatal signal, you should still +say so explicitly. Suppose something strange is going on, such as, +your copy of _GDBN__ is out of synch, or you have encountered a +bug in the C library on your system. (This has happened!) Your copy +might crash and ours would not. If you told us to expect a crash, +then when ours fails to crash, we would know that the bug was not +happening for us. If you had not told us to expect a crash, then we +would not be able to draw any conclusion from our observations. + +@item +If you wish to suggest changes to the _GDBN__ source, send us context +diffs. If you even discuss something in the _GDBN__ source, refer to +it by context, not by line number. + +The line numbers in our development sources won't match those in your +sources. Your line numbers would convey no useful information to us. + +@end itemize + +Here are some things that are not necessary: + +@itemize @bullet +@item +A description of the envelope of the bug. + +Often people who encounter a bug spend a lot of time investigating +which changes to the input file will make the bug go away and which +changes will not affect it. + +This is often time consuming and not very useful, because the way we +will find the bug is by running a single example under the debugger +with breakpoints, not by pure deduction from a series of examples. +We recommend that you save your time for something else. + +Of course, if you can find a simpler example to report @emph{instead} +of the original one, that is a convenience for us. Errors in the +output will be easier to spot, running under the debugger will take +less time, etc. + +However, simplification is not vital; if you don't want to do this, +report the bug anyway and send us the entire test case you used. + +@item +A patch for the bug. + +A patch for the bug does help us if it is a good one. But don't omit +the necessary information, such as the test case, on the assumption that +a patch is all we need. We might see problems with your patch and decide +to fix the problem another way, or we might not understand it at all. + +Sometimes with a program as complicated as _GDBN__ it is very hard to +construct an example that will make the program follow a certain path +through the code. If you don't send us the example, we won't be able +to construct one, so we won't be able to verify that the bug is fixed. + +And if we can't understand what bug you are trying to fix, or why your +patch should be an improvement, we won't install it. A test case will +help us to understand. + +@item +A guess about what the bug is or what it depends on. + +Such guesses are usually wrong. Even we can't guess right about such +things without first using the debugger to find the facts. +@end itemize |