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GNU Info File
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1994-02-06
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49KB
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814 lines
This is Info file gcc.info, produced by Makeinfo-1.49 from the input
file gcc.texi.
This file documents the use and the internals of the GNU compiler.
Copyright (C) 1988, 1989, 1992 Free Software Foundation, Inc.
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of
this manual under the conditions for verbatim copying, provided also
that the sections entitled "GNU General Public License" and "Protect
Your Freedom--Fight `Look And Feel'" are included exactly as in the
original, and provided that the entire resulting derived work is
distributed under the terms of a permission notice identical to this
Permission is granted to copy and distribute translations of this
manual into another language, under the above conditions for modified
versions, except that the sections entitled "GNU General Public
License" and "Protect Your Freedom--Fight `Look And Feel'", and this
permission notice, may be included in translations approved by the Free
Software Foundation instead of in the original English.
File: gcc.info, Node: Sending Patches, Prev: Bug Reporting, Up: Bugs
Sending Patches for GNU CC
==========================
If you would like to write bug fixes or improvements for the GNU C
compiler, that is very helpful. When you send your changes, please
follow these guidelines to avoid causing extra work for us in studying
the patches.
If you don't follow these guidelines, your information might still be
useful, but using it will take extra work. Maintaining GNU C is a lot
of work in the best of circumstances, and we can't keep up unless you do
your best to help.
* Send an explanation with your changes of what problem they fix or
what improvement they bring about. For a bug fix, just include a
copy of the bug report, and explain why the change fixes the bug.
(Referring to a bug report is not as good as including it, because
then we will have to look it up, and we have probably already
deleted it if we've already fixed the bug.)
* Always include a proper bug report for the problem you think you
have fixed. We need to convince ourselves that the change is
right before installing it. Even if it is right, we might have
trouble judging it if we don't have a way to reproduce the problem.
* Include all the comments that are appropriate to help people
reading the source in the future understand why this change was
needed.
* Don't mix together changes made for different reasons. Send them
*individually*.
If you make two changes for separate reasons, then we might not
want to install them both. We might want to install just one. If
you send them all jumbled together in a single set of diffs, we
have to do extra work to disentangle them--to figure out which
parts of the change serve which purpose. If we don't have time
for this, we might have to ignore your changes entirely.
If you send each change as soon as you have written it, with its
own explanation, then the two changes never get tangled up, and we
can consider each one properly without any extra work to
disentangle them.
Ideally, each change you send should be impossible to subdivide
into parts that we might want to consider separately, because each
of its parts gets its motivation from the other parts.
* Send each change as soon as that change is finished. Sometimes
people think they are helping us by accumulating many changes to
send them all together. As explained above, this is absolutely
the worst thing you could do.
Since you should send each change separately, you might as well
send it right away. That gives us the option of installing it
immediately if it is important.
* Use `diff -c' to make your diffs. Diffs without context are hard
for us to install reliably. More than that, they make it hard for
us to study the diffs to decide whether we want to install them.
Unidiff format is better than contextless diffs, but not as easy
to read as `-c' format.
If you have GNU diff, use `diff -cp', which shows the name of the
function that each change occurs in.
* Write the change log entries for your changes. We get lots of
changes, and we don't have time to do all the change log writing
ourselves.
Read the `ChangeLog' file to see what sorts of information to put
in, and to learn the style that we use. The purpose of the change
log is to show people where to find what was changed. So you need
to be specific about what functions you changed; in large
functions, it's often helpful to indicate where within the
function the change was.
On the other hand, once you have shown people where to find the
change, you need not explain its purpose. Thus, if you add a new
function, all you need to say about it is that it is new. If you
feel that the purpose needs explaining, it probably does--but the
explanation will be much more useful if you put it in comments in
the code.
If you would like your name to appear in the header line for who
made the change, send us the header line.
* When you write the fix, keep in mind that we can't install a
change that would break other systems.
People often suggest fixing a problem by changing
machine-independent files such as `toplev.c' to do something
special that a particular system needs. Sometimes it is totally
obvious that such changes would break GNU CC for almost all users.
We can't possibly make a change like that. At best it might tell
us how to write another patch that would solve the problem
acceptably.
Sometimes people send fixes that *might* be an improvement in
general--but it is hard to be sure of this. It's hard to install
such changes because we have to study them very carefully. Of
course, a good explanation of the reasoning by which you concluded
the change was correct can help convince us.
The safest changes are changes to the configuration files for a
particular machine. These are safe because they can't create new
bugs on other machines.
Please help us keep up with the workload by designing the patch in
a form that is good to install.
File: gcc.info, Node: Service, Next: VMS, Prev: Bugs, Up: Top
How To Get Help with GNU CC
***************************
If you need help installing, using or changing GNU CC, there are two
ways to find it:
* Send a message to a suitable network mailing list. First try
`bug-gcc@prep.ai.mit.edu', and if that brings no response, try
`help-gcc@prep.ai.mit.edu'.
* Look in the service directory for someone who might help you for a
fee. The service directory is found in the file named `SERVICE' in
the GNU CC distribution.
File: gcc.info, Node: VMS, Next: Portability, Prev: Service, Up: Top
Using GNU CC on VMS
*******************
* Menu:
* Include Files and VMS:: Where the preprocessor looks for the include files.
* Global Declarations:: How to do globaldef, globalref and globalvalue with
GNU CC.
* VMS Misc:: Misc information.
File: gcc.info, Node: Include Files and VMS, Next: Global Declarations, Up: VMS
Include Files and VMS
=====================
Due to the differences between the filesystems of Unix and VMS, GNU
CC attempts to translate file names in `#include' into names that VMS
will understand. The basic strategy is to prepend a prefix to the
specification of the include file, convert the whole filename to a VMS
filename, and then try to open the file. GNU CC tries various prefixes
one by one until one of them succeeds:
1. The first prefix is the `GNU_CC_INCLUDE:' logical name: this is
where GNU C header files are traditionally stored. If you wish to
store header files in non-standard locations, then you can assign
the logical `GNU_CC_INCLUDE' to be a s