This is ld.info, produced by makeinfo version 4.5 from ./ld.texinfo.

START-INFO-DIR-ENTRY
* Ld: (ld).                       The GNU linker.
END-INFO-DIR-ENTRY

   This file documents the GNU linker LD version 2.13.2.1.

   Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002
Free Software Foundation, Inc.


File: ld.info,  Node: Canonical format,  Prev: BFD information loss,  Up: BFD outline

The BFD canonical object-file format
------------------------------------

   The greatest potential for loss of information occurs when there is
the least overlap between the information provided by the source
format, that stored by the canonical format, and that needed by the
destination format. A brief description of the canonical form may help
you understand which kinds of data you can count on preserving across
conversions.

_files_
     Information stored on a per-file basis includes target machine
     architecture, particular implementation format type, a demand
     pageable bit, and a write protected bit.  Information like Unix
     magic numbers is not stored here--only the magic numbers' meaning,
     so a `ZMAGIC' file would have both the demand pageable bit and the
     write protected text bit set.  The byte order of the target is
     stored on a per-file basis, so that big- and little-endian object
     files may be used with one another.

_sections_
     Each section in the input file contains the name of the section,
     the section's original address in the object file, size and
     alignment information, various flags, and pointers into other BFD
     data structures.

_symbols_
     Each symbol contains a pointer to the information for the object
     file which originally defined it, its name, its value, and various
     flag bits.  When a BFD back end reads in a symbol table, it
     relocates all symbols to make them relative to the base of the
     section where they were defined.  Doing this ensures that each
     symbol points to its containing section.  Each symbol also has a
     varying amount of hidden private data for the BFD back end.  Since
     the symbol points to the original file, the private data format
     for that symbol is accessible.  `ld' can operate on a collection
     of symbols of wildly different formats without problems.

     Normal global and simple local symbols are maintained on output,
     so an output file (no matter its format) will retain symbols
     pointing to functions and to global, static, and common variables.
     Some symbol information is not worth retaining; in `a.out', type
     information is stored in the symbol table as long symbol names.
     This information would be useless to most COFF debuggers; the
     linker has command line switches to allow users to throw it away.

     There is one word of type information within the symbol, so if the
     format supports symbol type information within symbols (for
     example, COFF, IEEE, Oasys) and the type is simple enough to fit
     within one word (nearly everything but aggregates), the
     information will be preserved.

_relocation level_
     Each canonical BFD relocation record contains a pointer to the
     symbol to relocate to, the offset of the data to relocate, the
     section the data is in, and a pointer to a relocation type
     descriptor. Relocation is performed by passing messages through
     the relocation type descriptor and the symbol pointer. Therefore,
     relocations can be performed on output data using a relocation
     method that is only available in one of the input formats. For
     instance, Oasys provides a byte relocation format.  A relocation
     record requesting this relocation type would point indirectly to a
     routine to perform this, so the relocation may be performed on a
     byte being written to a 68k COFF file, even though 68k COFF has no
     such relocation type.

_line numbers_
     Object formats can contain, for debugging purposes, some form of
     mapping between symbols, source line numbers, and addresses in the
     output file.  These addresses have to be relocated along with the
     symbol information.  Each symbol with an associated list of line
     number records points to the first record of the list.  The head
     of a line number list consists of a pointer to the symbol, which
     allows finding out the address of the function whose line number
     is being described. The rest of the list is made up of pairs:
     offsets into the section and line numbers. Any format which can
     simply derive this information can pass it successfully between
     formats (COFF, IEEE and Oasys).


File: ld.info,  Node: Reporting Bugs,  Next: MRI,  Prev: BFD,  Up: Top

Reporting Bugs
**************

   Your bug reports play an essential role in making `ld' 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 `ld' work
better.  Bug reports are your contribution to the maintenance of `ld'.

   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


File: ld.info,  Node: Bug Criteria,  Next: Bug Reporting,  Up: Reporting Bugs

Have you found a bug?
=====================

   If you are not sure whether you have found a bug, here are some
guidelines:

   * If the linker gets a fatal signal, for any input whatever, that is
     a `ld' bug.  Reliable linkers never crash.

   * If `ld' produces an error message for valid input, that is a bug.

   * If `ld' does not produce an error message for invalid input, that
     may be a bug.  In the general case, the linker can not verify that
     object files are correct.

   * If you are an experienced user of linkers, your suggestions for
     improvement of `ld' are welcome in any case.


File: ld.info,  Node: Bug Reporting,  Prev: Bug Criteria,  Up: Reporting Bugs

How to report bugs
==================

   A number of companies and individuals offer support for GNU
products.  If you obtained `ld' from a support organization, we
recommend you contact that organization first.

   You can find contact information for many support companies and
individuals in the file `etc/SERVICE' in the GNU Emacs distribution.

   Otherwise, send bug reports for `ld' to `bug-binutils@gnu.org'.

   The fundamental principle of reporting bugs usefully is this:
*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 do not matter.  Thus, you might
assume that the name of a symbol you use in an example does not matter.
Well, probably it does not, 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 linker 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.  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 _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:

   * The version of `ld'.  `ld' announces it if you start it with the
     `--version' argument.

     Without this, we will not know whether there is any point in
     looking for the bug in the current version of `ld'.

   * Any patches you may have applied to the `ld' source, including any
     patches made to the `BFD' library.

   * The type of machine you are using, and the operating system name
     and version number.

   * What compiler (and its version) was used to compile `ld'--e.g.
     "`gcc-2.7'".

   * The command arguments you gave the linker to link your example and
     observe the bug.  To guarantee you will not omit something
     important, list them all.  A copy of the Makefile (or the output
     from make) is sufficient.

     If we were to try to guess the arguments, we would probably guess
     wrong and then we might not encounter the bug.

   * A complete input file, or set of input files, that will reproduce
     the bug.  It is generally most helpful to send the actual object
     files provided that they are reasonably small.  Say no more than
     10K.  For bigger files you can either make them available by FTP
     or HTTP or else state that you are willing to send the object
     file(s) to whomever requests them.  (Note - your email will be
     going to a mailing list, so we do not want to clog it up with
     large attachments).  But small attachments are best.

     If the source files were assembled using `gas' or compiled using
     `gcc', then it may be OK to send the source files rather than the
     object files.  In this case, be sure to say exactly what version of
     `gas' or `gcc' was used to produce the object files.  Also say how
     `gas' or `gcc' were configured.

   * 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 `ld' 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.  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 `ld' 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.

   * If you wish to suggest changes to the `ld' source, send us context
     diffs, as generated by `diff' with the `-u', `-c', or `-p' option.
     Always send diffs from the old file to the new file.  If you even
     discuss something in the `ld' source, refer to it by context, not
     by line number.

     The line numbers in our development sources will not match those
     in your sources.  Your line numbers would convey no useful
     information to us.

   Here are some things that are not necessary:

   * 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 _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, and so on.

     However, simplification is not vital; if you do not want to do
     this, report the bug anyway and send us the entire test case you
     used.

   * A patch for the bug.

     A patch for the bug does help us if it is a good one.  But do not
     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 `ld' it is very hard to
     construct an example that will make the program follow a certain
     path through the code.  If you do not send us the example, we will
     not be able to construct one, so we will not be able to verify
     that the bug is fixed.

     And if we cannot understand what bug you are trying to fix, or why
     your patch should be an improvement, we will not install it.  A
     test case will help us to understand.

   * A guess about what the bug is or what it depends on.

     Such guesses are usually wrong.  Even we cannot guess right about
     such things without first using the debugger to find the facts.


File: ld.info,  Node: MRI,  Next: GNU Free Documentation License,  Prev: Reporting Bugs,  Up: Top

MRI Compatible Script Files
***************************

   To aid users making the transition to GNU `ld' from the MRI linker,
`ld' can use MRI compatible linker scripts as an alternative to the
more general-purpose linker scripting language described in *Note
Scripts::.  MRI compatible linker scripts have a much simpler command
set than the scripting language otherwise used with `ld'.  GNU `ld'
supports the most commonly used MRI linker commands; these commands are
described here.

   In general, MRI scripts aren't of much use with the `a.out' object
file format, since it only has three sections and MRI scripts lack some
features to make use of them.

   You can specify a file containing an MRI-compatible script using the
`-c' command-line option.

   Each command in an MRI-compatible script occupies its own line; each
command line starts with the keyword that identifies the command (though
blank lines are also allowed for punctuation).  If a line of an
MRI-compatible script begins with an unrecognized keyword, `ld' issues
a warning message, but continues processing the script.

   Lines beginning with `*' are comments.

   You can write these commands using all upper-case letters, or all
lower case; for example, `chip' is the same as `CHIP'.  The following
list shows only the upper-case form of each command.

`ABSOLUTE SECNAME'
`ABSOLUTE SECNAME, SECNAME, ... SECNAME'
     Normally, `ld' includes in the output file all sections from all
     the input files.  However, in an MRI-compatible script, you can
     use the `ABSOLUTE' command to restrict the sections that will be
     present in your output program.  If the `ABSOLUTE' command is used
     at all in a script, then only the sections named explicitly in
     `ABSOLUTE' commands will appear in the linker output.  You can
     still use other input sections (whatever you select on the command
     line, or using `LOAD') to resolve addresses in the output file.

`ALIAS OUT-SECNAME, IN-SECNAME'
     Use this command to place the data from input section IN-SECNAME
     in a section called OUT-SECNAME in the linker output file.

     IN-SECNAME may be an integer.

`ALIGN SECNAME = EXPRESSION'
     Align the section called SECNAME to EXPRESSION.  The EXPRESSION
     should be a power of two.

`BASE EXPRESSION'
     Use the value of EXPRESSION as the lowest address (other than
     absolute addresses) in the output file.

`CHIP EXPRESSION'
`CHIP EXPRESSION, EXPRESSION'
     This command does nothing; it is accepted only for compatibility.

`END'
     This command does nothing whatever; it's only accepted for
     compatibility.

`FORMAT OUTPUT-FORMAT'
     Similar to the `OUTPUT_FORMAT' command in the more general linker
     language, but restricted to one of these output formats:

       1. S-records, if OUTPUT-FORMAT is `S'

       2. IEEE, if OUTPUT-FORMAT is `IEEE'

       3. COFF (the `coff-m68k' variant in BFD), if OUTPUT-FORMAT is
          `COFF'

`LIST ANYTHING...'
     Print (to the standard output file) a link map, as produced by the
     `ld' command-line option `-M'.

     The keyword `LIST' may be followed by anything on the same line,
     with no change in its effect.

`LOAD FILENAME'
`LOAD FILENAME, FILENAME, ... FILENAME'
     Include one or more object file FILENAME in the link; this has the
     same effect as specifying FILENAME directly on the `ld' command
     line.

`NAME OUTPUT-NAME'
     OUTPUT-NAME is the name for the program produced by `ld'; the
     MRI-compatible command `NAME' is equivalent to the command-line
     option `-o' or the general script language command `OUTPUT'.

`ORDER SECNAME, SECNAME, ... SECNAME'
`ORDER SECNAME SECNAME SECNAME'
     Normally, `ld' orders the sections in its output file in the order
     in which they first appear in the input files.  In an
     MRI-compatible script, you can override this ordering with the
     `ORDER' command.  The sections you list with `ORDER' will appear
     first in your output file, in the order specified.

`PUBLIC NAME=EXPRESSION'
`PUBLIC NAME,EXPRESSION'
`PUBLIC NAME EXPRESSION'
     Supply a value (EXPRESSION) for external symbol NAME used in the
     linker input files.

`SECT SECNAME, EXPRESSION'
`SECT SECNAME=EXPRESSION'
`SECT SECNAME EXPRESSION'
     You can use any of these three forms of the `SECT' command to
     specify the start address (EXPRESSION) for section SECNAME.  If
     you have more than one `SECT' statement for the same SECNAME, only
     the _first_ sets the start address.


File: ld.info,  Node: GNU Free Documentation License,  Next: Index,  Prev: MRI,  Up: Top

GNU Free Documentation License
******************************

   GNU Free Documentation License

   Version 1.1, March 2000

   Copyright (C) 2000  Free Software Foundation, Inc.    59 Temple
Place, Suite 330, Boston, MA  02111-1307  USA

   Everyone is permitted to copy and distribute verbatim copies  of
this license document, but changing it is not allowed.

   0. PREAMBLE

   The purpose of this License is to make a manual, textbook, or other
written document "free" in the sense of freedom: to assure everyone the
effective freedom to copy and redistribute it, with or without
modifying it, either commercially or noncommercially.  Secondarily,
this License preserves for the author and publisher a way to get credit
for their work, while not being considered responsible for
modifications made by others.

   This License is a kind of "copyleft", which means that derivative
works of the document must themselves be free in the same sense.  It
complements the GNU General Public License, which is a copyleft license
designed for free software.

   We have designed this License in order to use it for manuals for free
software, because free software needs free documentation: a free
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   1. APPLICABILITY AND DEFINITIONS

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   If the Cover Text requirement of section 3 is applicable to these
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of the entire aggregate, the Document's Cover Texts may be placed on
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   Translation is considered a kind of modification, so you may
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   9. TERMINATION

   You may not copy, modify, sublicense, or distribute the Document
except as expressly provided for under this License.  Any other attempt
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automatically terminate your rights under this License.  However,
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   10. FUTURE REVISIONS OF THIS LICENSE

   The Free Software Foundation may publish new, revised versions of
the GNU Free Documentation License from time to time.  Such new
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http://www.gnu.org/copyleft/.

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If the Document specifies that a particular numbered version of this
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   ADDENDUM: How to use this License for your documents

   To use this License in a document you have written, include a copy of
the License in the document and put the following copyright and license
notices just after the title page:

         Copyright (c)  YEAR  YOUR NAME.
         Permission is granted to copy, distribute and/or modify this document
         under the terms of the GNU Free Documentation License, Version 1.1
         or any later version published by the Free Software Foundation;
         with the Invariant Sections being LIST THEIR TITLES, with the
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   If your document contains nontrivial examples of program code, we
recommend releasing these examples in parallel under your choice of
free software license, such as the GNU General Public License, to
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