objcopy

objcopy(1)                   GNU Development Tools                  objcopy(1)



NAME
       objcopy - copy and translate object files


SYNOPSIS
       objcopy
              [-F bfdname | --target=bfdname]
              [-I bfdname | --input-target=bfdname]
              [-O bfdname | --output-target=bfdname]
              [-R sectionname | --remove-section=sectionname]
              [-S | --strip-all] [-g | --strip-debug] [--strip-unneeded]
              [-K symbolname | --keep-symbol=symbolname]
              [-N symbolname | --strip-symbol=symbolname] [-x | --discard-all]
              [-X | --discard-locals] [-b byte | --byte=byte]
              [-i interleave | --interleave=interleave] [--debugging]
              [--gap-fill=val] [--pad-to=address] [--set-start=val]
              [--adjust-start=incr] [--adjust-vma=incr]
              [--adjust-section-vma=section{=,+,-}val] [--adjust-warnings]
              [--no-adjust-warnings] [--set-section-flags=section=flags]
              [--add-section=sectionname=filename] [--change-leading-char]
              [--remove-leading-char] [--weaken] [-v | --verbose]
              [-V | --version] [--help] infile [outfile]

DESCRIPTION
       The GNU objcopy utility copies the contents of an object file to
       another.  objcopy uses the GNU BFD Library to read and write the object
       files.  It can write the destination object file in a format different
       from that of the source object file.  The exact behavior of objcopy is
       controlled by command-line options.

       objcopy creates temporary files to do its translations and deletes them
       afterward.  objcopy uses BFD to do all its translation work; it knows
       about all the formats BFD knows about, and thus is able to recognize
       most formats without being told explicitly.

       objcopy can be used to generate S-records by using an output target of
       srec (e.g., use -O srec).

       objcopy can be used to generate a raw binary file by using an output
       target of binary (e.g., use -O binary).  When objcopy generates a raw
       binary file, it will essentially produce a memory dump of the contents
       of the input object file.  All symbols and relocation information will
       be discarded.  The memory dump will start at the virtual address of the
       lowest section copied into the output file.

       When generating an S-record or a raw binary file, it may be helpful to
       use -S to remove sections containing debugging information.  In some
       cases -R will be useful to remove sections which contain information
       which is not needed by the binary file.

       infile and outfile are the source and output files respectively.  If
       you do not specify outfile, objcopy creates a temporary file and
       destructively renames the result with the name of the input file.


OPTIONS
       -I bfdname, --input-target=bfdname
              Consider the source file's object format to be bfdname, rather
              than attempting to deduce it.

       -O bfdname, --output-target=bfdname
              Write the output file using the object format bfdname.

       -F bfdname, --target=bfdname
              Use bfdname as the object format for both the input and the
              output file; i.e.  simply transfer data from source to
              destination with no translation.

       -R sectionname, --remove-section=sectionname
              Remove the named section from the file.  This option may be
              given more than once.  Note that using this option
              inappropriately may make the output file unusable.

       -S, --strip-all
              Do not copy relocation and symbol information from the source
              file.

       -g, --strip-debug
              Do not copy debugging symbols from the source file.

       --strip-unneeded
              Strip all symbols that are not needed for relocation processing.

       -K symbolname, --keep-symbol=symbolname
              Copy only symbol symbolname from the source file. This option
              may be given more than once.

       -N symbolname, --strip-symbol=symbolname
              Do not copy symbol symbolname from the source file. This option
              may be given more than once, and may be combined with strip
              options other than -K.

       -x,  --discard-all
              Do not copy non-global symbols from the source file.

       -X, --discard-locals
              Do not copy compiler-generated local symbols. (These usually
              start with "L" or ".").

       -b byte, --byte=byte
              Keep only every byteth byte of the input file (header data is
              not affected).  byte can be in the range from 0 to the
              interleave-1.  This option is useful for creating files to
              program ROMs.  It is typically used with an srec output target.

       -i interleave, --interleave=interleave
              Only copy one out of every interleave bytes.  Which one to copy
              is selected by the -b or --byte option.  The default is 4.  The
              interleave is ignored if neither -b nor --byte is given.

       --debugging
              Convert debugging information, if possible.  This is not the
              default because only certain debugging formats are supported,
              and the conversion process can be time consuming.

       --gap-fill=val
              Fill gaps between sections with val.  This is done by increasing
              the size of the section with the lower address, and filling in
              the extra space created with val.

       --pad-to=address
              Pad the output file up to the virtual address address.  This is
              done by increasing the size of the last section.  The extra
              space is filled in with the value specified by --gap-fill
              (default zero).

       --set-start=val
              Set the start address of the new file to val.  Not all object
              file formats support setting the start address.

       --adjust-start=incr
              Adjust the start address by adding incr.  Not all object file
              formats support setting the start address.

       --adjust-vma=incr
              Adjust the address of all sections, as well as the start
              address, by adding incr.  Some object file formats do not permit
              section addresses to be changed arbitrarily.  Note that this
              does not relocate the sections; if the program expects sections
              to be loaded at a certain address, and this option is used to
              change the sections such that they are loaded at a different
              address, the program may fail.

       --adjust-section-vma=section{=,+,-}val
              Set or adjust the address of the named section.  If = is used,
              the section address is set to val.  Otherwise, val is added to
              or subtracted from the section address.  See the comments under
              --adjust-vma, above.  If section does not exist in the input
              file, a warning will be issued, unless --no-adjust-warnings is
              used.

       --adjust-warnings
              If --adjust-section-vma is used, and the named section does not
              exist, issue a warning.  This is the default.

       --no-adjust-warnings
              Do not issue a warning if --adjust-section-vma is used, even if
              the named section does not exist.

       --set-section-flags=section=flags
              Set the flags for the named section.  The flags argument is a
              comma separated string of flag names.  The recognized names are
              alloc, load, readonly, code, data, and rom.  Not all flags are
              meaningful for all object file formats.

       --add-section=sectionname=filename
              Add a new section named sectionname while copying the file.  The
              contents of the new section are taken from the file filename.
              The size of the section will be the size of the file.  This
              option only works on file formats which can support sections
              with arbitrary names.

       --change-leading-char
              Some object file formats use special characters at the start of
              symbols.  The most common such character is underscore, which
              compilers often add before every symbol.  This option tells
              objcopy to change the leading character of every symbol when it
              converts between object file formats.  If the object file
              formats use the same leading character, this option has no
              effect.  Otherwise, it will add a character, or remove a
              character, or change a character, as appropriate.

       --remove-leading-char
              If the first character of a global symbol is a special symbol
              leading character used by the object file format, remove the
              character.  The most common symbol leading character is
              underscore.  This option will remove a leading underscore from
              all global symbols.  This can be useful if you want to link
              together objects of different file formats with different
              conventions for symbol names.  This is different from
              @code{--change-leading-char} because it always changes the
              symbol name when appropriate, regardless of the object file
              format of the output

       -weaken
              Change all global symbols in the file to be weak.

       -v, --verbose
              Verbose output: list all object files modified.  In the case of
              archives, "objcopy -V" lists all members of the archive.

       -V, --version
              Show the version number of objcopy and exit.

       --help Show a summary of the options to objcopy and exit.

SEE ALSO
       `binutils' entry in info; The GNU Binary Utilities, Roland H. Pesch
       (June 1993).


COPYING
       Copyright (c) 1993, 94, 95, 1996 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 that the
       entire resulting derived work is distributed under the terms of a
       permission notice identical to this one.

       Permission is granted to copy and distribute translations of this
       manual into another language, under the above conditions for modified
       versions, except that this permission notice may be included in
       translations approved by the Free Software Foundation instead of in the
       original English.



cygnus support                   October 1994                       objcopy(1)