Linux "objcopy" Command Line Options and Examples
copy and translate object files
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.
Usage:
objcopy [-F bfdname|--target=bfdname]
[-I bfdname|--input-target=bfdname]
[-O bfdname|--output-target=bfdname]
[-B bfdarch|--binary-architecture=bfdarch]
[-S|--strip-all]
[-g|--strip-debug]
[--strip-unneeded]
[-K symbolname|--keep-symbol=symbolname]
[-N symbolname|--strip-symbol=symbolname]
[--strip-unneeded-symbol=symbolname]
[-G symbolname|--keep-global-symbol=symbolname]
[--localize-hidden]
[-L symbolname|--localize-symbol=symbolname]
[--globalize-symbol=symbolname]
[-W symbolname|--weaken-symbol=symbolname]
[-w|--wildcard]
[-x|--discard-all]
[-X|--discard-locals]
[-b byte|--byte=byte]
[-i [breadth]|--interleave[=breadth]]
[--interleave-width=width]
[-j sectionpattern|--only-section=sectionpattern]
[-R sectionpattern|--remove-section=sectionpattern]
[--remove-relocations=sectionpattern]
[-p|--preserve-dates]
[-D|--enable-deterministic-archives]
[-U|--disable-deterministic-archives]
[--debugging]
[--gap-fill=val]
[--pad-to=address]
[--set-start=val]
[--adjust-start=incr]
[--change-addresses=incr]
[--change-section-address sectionpattern{=,+,-}val]
[--change-section-lma sectionpattern{=,+,-}val]
[--change-section-vma sectionpattern{=,+,-}val]
[--change-warnings] [--no-change-warnings]
[--set-section-flags sectionpattern=flags]
[--add-section sectionname=filename]
[--dump-section sectionname=filename]
[--update-section sectionname=filename]
[--rename-section oldname=newname[,flags]]
[--long-section-names {enable,disable,keep}]
[--change-leading-char] [--remove-leading-char]
[--reverse-bytes=num]
[--srec-len=ival] [--srec-forceS3]
[--redefine-sym old=new]
[--redefine-syms=filename]
[--weaken]
[--keep-symbols=filename]
[--strip-symbols=filename]
[--strip-unneeded-symbols=filename]
[--keep-global-symbols=filename]
[--localize-symbols=filename]
[--globalize-symbols=filename]
[--weaken-symbols=filename]
[--add-symbol name=[section:]value[,flags]
[--alt-machine-code=index]
[--prefix-symbols=string]
[--prefix-sections=string]
[--prefix-alloc-sections=string]
[--add-gnu-debuglink=path-to-file]
[--keep-file-symbols]
[--only-keep-debug]
[--strip-dwo]
[--extract-dwo]
[--extract-symbol]
[--writable-text]
[--readonly-text]
[--pure]
[--impure]
[--file-alignment=num]
[--heap=size]
[--image-base=address]
[--section-alignment=num]
[--stack=size]
[--subsystem=which:major.minor]
[--compress-debug-sections]
[--decompress-debug-sections]
[--elf-stt-common=val]
[--merge-notes]
[--no-merge-notes]
[-v|--verbose]
[-V|--version]
[--help] [--info]
infile [outfile]
Command Line Options:
--input-target
Consider the source file's object format to be bfdname, rather than attempting to deduce it.
objcopy --input-target ...
--output-target
Write the output file using the object format bfdname.
objcopy --output-target ...
--target
Use bfdname as the object format for both the input and the output file; i.e., simply transfer data fromsource to destination with no translation.
objcopy --target ...
--binary-architecture
Useful when transforming a architecture-less input file into an object file. In this case the outputarchitecture can be set to bfdarch. This option will be ignored if the input file has a known bfdarch.You can access this binary data inside a program by referencing the special symbols that are created bythe conversion process. These symbols are called _binary_objfile_start, _binary_objfile_end and_binary_objfile_size. e.g. you can transform a picture file into an object file and then access it inyour code using these symbols.
objcopy --binary-architecture ...
--only-section
Copy only the indicated sections from the input file to the output file. This option may be given morethan once. Note that using this option inappropriately may make the output file unusable. Wildcardcharacters are accepted in sectionpattern.If the first character of sectionpattern is the exclamation point (!) then matching sections will not becopied, even if earlier use of --only-section on the same command line would otherwise copy it. Forexample:
objcopy --only-section ...
--remove-section
Remove any section matching sectionpattern from the output file. This option may be given more than once.Note that using this option inappropriately may make the output file unusable. Wildcard characters areaccepted in sectionpattern. Using both the -j and -R options together results in undefined behaviour.If the first character of sectionpattern is the exclamation point (!) then matching sections will not beremoved even if an earlier use of --remove-section on the same command line would otherwise remove it.For example:
objcopy --remove-section ...
--remove-relocations
Remove relocations from the output file for any section matching sectionpattern. This option may be givenmore than once. Note that using this option inappropriately may make the output file unusable. Wildcardcharacters are accepted in sectionpattern. For example:
objcopy --remove-relocations ...
--strip-all
Do not copy relocation and symbol information from the source file.
objcopy --strip-all ...
--strip-debug
Do not copy debugging symbols or sections from the source file.
objcopy --strip-debug ...
--strip-unneeded
Strip all symbols that are not needed for relocation processing.
objcopy --strip-unneeded ...
--keep-symbol
When stripping symbols, keep symbol symbolname even if it would normally be stripped. This option may begiven more than once.
objcopy --keep-symbol ...
--strip-symbol
Do not copy symbol symbolname from the source file. This option may be given more than once.
objcopy --strip-symbol ...
--strip-unneeded-symbol
Do not copy symbol symbolname from the source file unless it is needed by a relocation. This option maybe given more than once.
objcopy --strip-unneeded-symbol ...
--keep-global-symbol
Keep only symbol symbolname global. Make all other symbols local to the file, so that they are notvisible externally. This option may be given more than once.
objcopy --keep-global-symbol ...
--localize-hidden
In an ELF object, mark all symbols that have hidden or internal visibility as local. This option applieson top of symbol-specific localization options such as -L.
objcopy --localize-hidden ...
--localize-symbol
Convert a global or weak symbol called symbolname into a local symbol, so that it is not visibleexternally. This option may be given more than once. Note - unique symbols are not converted.
objcopy --localize-symbol ...
--weaken-symbol
Make symbol symbolname weak. This option may be given more than once.
objcopy --weaken-symbol ...
--globalize-symbol
Give symbol symbolname global scoping so that it is visible outside of the file in which it is defined.This option may be given more than once.
objcopy --globalize-symbol ...
--wildcard
Permit regular expressions in symbolnames used in other command line options. The question mark (?),asterisk (*), backslash (\) and square brackets ([]) operators can be used anywhere in the symbol name.If the first character of the symbol name is the exclamation point (!) then the sense of the switch isreversed for that symbol. For example:
objcopy --wildcard ...
-w
would cause objcopy to weaken all symbols that start with "fo" except for the symbol "foo".
objcopy -w ...
--discard-all
Do not copy non-global symbols from the source file.
objcopy --discard-all ...
--discard-locals
Do not copy compiler-generated local symbols. (These usually start with L or ..)
objcopy --discard-locals ...
--byte
If interleaving has been enabled via the --interleave option then start the range of bytes to keep at thebyteth byte. byte can be in the range from 0 to breadth-1, where breadth is the value given by the
objcopy --byte ...
--interleave[
Only copy a range out of every breadth bytes. (Header data is not affected). Select which byte in therange begins the copy with the --byte option. Select the width of the range with the --interleave-widthoption.This option is useful for creating files to program ROM. It is typically used with an "srec" outputtarget. Note that objcopy will complain if you do not specify the --byte option as well.The default interleave breadth is 4, so with --byte set to 0, objcopy would copy the first byte out ofevery four bytes from the input to the output.
objcopy --interleave[ ...
--interleave-width
When used with the --interleave option, copy width bytes at a time. The start of the range of bytes to becopied is set by the --byte option, and the extent of the range is set with the --interleave option.The default value for this option is 1. The value of width plus the byte value set by the --byte optionmust not exceed the interleave breadth set by the --interleave option.This option can be used to create images for two 16-bit flashes interleaved in a 32-bit bus by passing -b
objcopy --interleave-width ...
--preserve-dates
Set the access and modification dates of the output file to be the same as those of the input file.
objcopy --preserve-dates ...
--enable-deterministic-archives
Operate in deterministic mode. When copying archive members and writing the archive index, use zero forUIDs, GIDs, timestamps, and use consistent file modes for all files.If binutils was configured with --enable-deterministic-archives, then this mode is on by default. It canbe disabled with the -U option, below.
objcopy --enable-deterministic-archives ...
--disable-deterministic-archives
Do not operate in deterministic mode. This is the inverse of the -D option, above: when copying archivemembers and writing the archive index, use their actual UID, GID, timestamp, and file mode values.This is the default unless binutils was configured with --enable-deterministic-archives.
objcopy --disable-deterministic-archives ...
--debugging
Convert debugging information, if possible. This is not the default because only certain debuggingformats are supported, and the conversion process can be time consuming.
objcopy --debugging ...
--gap-fill
Fill gaps between sections with val. This operation applies to the load address (LMA) of the sections.It is done by increasing the size of the section with the lower address, and filling in the extra spacecreated with val.
objcopy --gap-fill ...
--pad-to
Pad the output file up to the load address address. This is done by increasing the size of the lastsection. The extra space is filled in with the value specified by --gap-fill (default zero).
objcopy --pad-to ...
--set-start
Set the start address of the new file to val. Not all object file formats support setting the startaddress.
objcopy --set-start ...
--adjust-start
Change the start address by adding incr. Not all object file formats support setting the start address.
objcopy --adjust-start ...
--adjust-vma
Change the VMA and LMA addresses of all sections, as well as the start address, by adding incr. Someobject file formats do not permit section addresses to be changed arbitrarily. Note that this does notrelocate the sections; if the program expects sections to be loaded at a certain address, and this optionis used to change the sections such that they are loaded at a different address, the program may fail.
objcopy --adjust-vma ...
--change-section-address
sectionpattern{=,+,-}val
objcopy --change-section-address ...
--adjust-section-vma
Set or change both the VMA address and the LMA address of any section matching sectionpattern. If = isused, the section address is set to val. Otherwise, val is added to or subtracted from the sectionaddress. See the comments under --change-addresses, above. If sectionpattern does not match any sectionsin the input file, a warning will be issued, unless --no-change-warnings is used.
objcopy --adjust-section-vma ...
--change-section-lma
Set or change the LMA address of any sections matching sectionpattern. The LMA address is the addresswhere the section will be loaded into memory at program load time. Normally this is the same as the VMAaddress, which is the address of the section at program run time, but on some systems, especially thosewhere a program is held in ROM, the two can be different. If = is used, the section address is set toval. Otherwise, val is added to or subtracted from the section address. See the comments under
objcopy --change-section-lma ...
--change-section-vma
Set or change the VMA address of any section matching sectionpattern. The VMA address is the addresswhere the section will be located once the program has started executing. Normally this is the same asthe LMA address, which is the address where the section will be loaded into memory, but on some systems,especially those where a program is held in ROM, the two can be different. If = is used, the sectionaddress is set to val. Otherwise, val is added to or subtracted from the section address. See thecomments under --change-addresses, above. If sectionpattern does not match any sections in the inputfile, a warning will be issued, unless --no-change-warnings is used.
objcopy --change-section-vma ...
--adjust-warnings
If --change-section-address or --change-section-lma or --change-section-vma is used, and the sectionpattern does not match any sections, issue a warning. This is the default.
objcopy --adjust-warnings ...
--no-adjust-warnings
Do not issue a warning if --change-section-address or --adjust-section-lma or --adjust-section-vma isused, even if the section pattern does not match any sections.
objcopy --no-adjust-warnings ...
--set-section-flags
Set the flags for any sections matching sectionpattern. The flags argument is a comma separated string offlag names. The recognized names are alloc, contents, load, noload, readonly, code, data, rom, share, anddebug. You can set the contents flag for a section which does not have contents, but it is not meaningfulto clear the contents flag of a section which does have contents--just remove the section instead. Notall flags are meaningful for all object file formats.
objcopy --set-section-flags ...
--add-section
Add a new section named sectionname while copying the file. The contents of the new section are takenfrom the file filename. The size of the section will be the size of the file. This option only works onfile formats which can support sections with arbitrary names. Note - it may be necessary to use the
objcopy --add-section ...
--dump-section
Place the contents of section named sectionname into the file filename, overwriting any contents that mayhave been there previously. This option is the inverse of --add-section. This option is similar to the
objcopy --dump-section ...
--update-section
Replace the existing contents of a section named sectionname with the contents of file filename. The sizeof the section will be adjusted to the size of the file. The section flags for sectionname will beunchanged. For ELF format files the section to segment mapping will also remain unchanged, somethingwhich is not possible using --remove-section followed by --add-section. The option can be specified morethan once.Note - it is possible to use --rename-section and --update-section to both update and rename a sectionfrom one command line. In this case, pass the original section name to --update-section, and the originaland new section names to --rename-section.
objcopy --update-section ...
--add-symbol
Add a new symbol named name while copying the file. This option may be specified multiple times. If thesection is given, the symbol will be associated with and relative to that section, otherwise it will be anABS symbol. Specifying an undefined section will result in a fatal error. There is no check for thevalue, it will be taken as specified. Symbol flags can be specified and not all flags will be meaningfulfor all object file formats. By default, the symbol will be global. The special flag 'before=othersym'will insert the new symbol in front of the specified othersym, otherwise the symbol(s) will be added atthe end of the symbol table in the order they appear.
objcopy --add-symbol ...
--rename-section
Rename a section from oldname to newname, optionally changing the section's flags to flags in the process.This has the advantage over using a linker script to perform the rename in that the output stays as anobject file and does not become a linked executable.This option is particularly helpful when the input format is binary, since this will always create asection called .data. If for example, you wanted instead to create a section called .rodata containingbinary data you could use the following command line to achieve it:objcopy -I binary -O <output_format> -B <architecture> \
objcopy --rename-section ...
--long-section-names
Controls the handling of long section names when processing "COFF" and "PE-COFF" object formats. Thedefault behaviour, keep, is to preserve long section names if any are present in the input file. Theenable and disable options forcibly enable or disable the use of long section names in the output object;when disable is in effect, any long section names in the input object will be truncated. The enableoption will only emit long section names if any are present in the inputs; this is mostly the same askeep, but it is left undefined whether the enable option might force the creation of an empty string tablein the output file.
objcopy --long-section-names ...
--change-leading-char
Some object file formats use special characters at the start of symbols. The most common such characteris underscore, which compilers often add before every symbol. This option tells objcopy to change theleading character of every symbol when it converts between object file formats. If the object fileformats use the same leading character, this option has no effect. Otherwise, it will add a character, orremove a character, or change a character, as appropriate.
objcopy --change-leading-char ...
--remove-leading-char
If the first character of a global symbol is a special symbol leading character used by the object fileformat, remove the character. The most common symbol leading character is underscore. This option willremove a leading underscore from all global symbols. This can be useful if you want to link togetherobjects of different file formats with different conventions for symbol names. This is different from
objcopy --remove-leading-char ...
--reverse-bytes
Reverse the bytes in a section with output contents. A section length must be evenly divisible by thevalue given in order for the swap to be able to take place. Reversing takes place before the interleavingis performed.This option is used typically in generating ROM images for problematic target systems. For example, onsome target boards, the 32-bit words fetched from 8-bit ROMs are re-assembled in little-endian byte orderregardless of the CPU byte order. Depending on the programming model, the endianness of the ROM may needto be modified.Consider a simple file with a section containing the following eight bytes: 12345678.Using --reverse-bytes=2 for the above example, the bytes in the output file would be ordered 21436587.Using --reverse-bytes=4 for the above example, the bytes in the output file would be ordered 43218765.By using --reverse-bytes=2 for the above example, followed by --reverse-bytes=4 on the output file, thebytes in the second output file would be ordered 34127856.
objcopy --reverse-bytes ...
--srec-len
Meaningful only for srec output. Set the maximum length of the Srecords being produced to ival. Thislength covers both address, data and crc fields.
objcopy --srec-len ...
--srec-forceS3
Meaningful only for srec output. Avoid generation of S1/S2 records, creating S3-only record format.
objcopy --srec-forceS3 ...
--redefine-sym
Change the name of a symbol old, to new. This can be useful when one is trying link two things togetherfor which you have no source, and there are name collisions.
objcopy --redefine-sym ...
--redefine-syms
Apply --redefine-sym to each symbol pair "old new" listed in the file filename. filename is simply a flatfile, with one symbol pair per line. Line comments may be introduced by the hash character. This optionmay be given more than once.
objcopy --redefine-syms ...
--weaken
Change all global symbols in the file to be weak. This can be useful when building an object which willbe linked against other objects using the -R option to the linker. This option is only effective whenusing an object file format which supports weak symbols.
objcopy --weaken ...
--keep-symbols
Apply --keep-symbol option to each symbol listed in the file filename. filename is simply a flat file,with one symbol name per line. Line comments may be introduced by the hash character. This option may begiven more than once.
objcopy --keep-symbols ...
--strip-symbols
Apply --strip-symbol option to each symbol listed in the file filename. filename is simply a flat file,with one symbol name per line. Line comments may be introduced by the hash character. This option may begiven more than once.
objcopy --strip-symbols ...
--strip-unneeded-symbols
Apply --strip-unneeded-symbol option to each symbol listed in the file filename. filename is simply aflat file, with one symbol name per line. Line comments may be introduced by the hash character. Thisoption may be given more than once.
objcopy --strip-unneeded-symbols ...
--keep-global-symbols
Apply --keep-global-symbol option to each symbol listed in the file filename. filename is simply a flatfile, with one symbol name per line. Line comments may be introduced by the hash character. This optionmay be given more than once.
objcopy --keep-global-symbols ...
--localize-symbols
Apply --localize-symbol option to each symbol listed in the file filename. filename is simply a flatfile, with one symbol name per line. Line comments may be introduced by the hash character. This optionmay be given more than once.
objcopy --localize-symbols ...
--globalize-symbols
Apply --globalize-symbol option to each symbol listed in the file filename. filename is simply a flatfile, with one symbol name per line. Line comments may be introduced by the hash character. This optionmay be given more than once.
objcopy --globalize-symbols ...
--weaken-symbols
Apply --weaken-symbol option to each symbol listed in the file filename. filename is simply a flat file,with one symbol name per line. Line comments may be introduced by the hash character. This option may begiven more than once.
objcopy --weaken-symbols ...
--alt-machine-code
If the output architecture has alternate machine codes, use the indexth code instead of the default one.This is useful in case a machine is assigned an official code and the tool-chain adopts the new code, butother applications still depend on the original code being used. For ELF based architectures if the indexalternative does not exist then the value is treated as an absolute number to be stored in the e_machinefield of the ELF header.
objcopy --alt-machine-code ...
--writable-text
Mark the output text as writable. This option isn't meaningful for all object file formats.
objcopy --writable-text ...
--readonly-text
Make the output text write protected. This option isn't meaningful for all object file formats.
objcopy --readonly-text ...
--pure
Mark the output file as demand paged. This option isn't meaningful for all object file formats.
objcopy --pure ...
--impure
Mark the output file as impure. This option isn't meaningful for all object file formats.
objcopy --impure ...
--prefix-symbols
Prefix all symbols in the output file with string.
objcopy --prefix-symbols ...
--prefix-sections
Prefix all section names in the output file with string.
objcopy --prefix-sections ...
--prefix-alloc-sections
Prefix all the names of all allocated sections in the output file with string.
objcopy --prefix-alloc-sections ...
--add-gnu-debuglink
Creates a .gnu_debuglink section which contains a reference to path-to-file and adds it to the outputfile. Note: the file at path-to-file must exist. Part of the process of adding the .gnu_debuglinksection involves embedding a checksum of the contents of the debug info file into the section.If the debug info file is built in one location but it is going to be installed at a later time into adifferent location then do not use the path to the installed location. The --add-gnu-debuglink optionwill fail because the installed file does not exist yet. Instead put the debug info file in the currentdirectory and use the --add-gnu-debuglink option without any directory components, like this:objcopy --add-gnu-debuglink=foo.debugAt debug time the debugger will attempt to look for the separate debug info file in a set of knownlocations. The exact set of these locations varies depending upon the distribution being used, but ittypically includes:"* The same directory as the executable.""* A sub-directory of the directory containing the executable"called .debug"* A global debug directory such as /usr/lib/debug."As long as the debug info file has been installed into one of these locations before the debugger is runeverything should work correctly.
objcopy --add-gnu-debuglink ...
--keep-file-symbols
When stripping a file, perhaps with --strip-debug or --strip-unneeded, retain any symbols specifyingsource file names, which would otherwise get stripped.
objcopy --keep-file-symbols ...
--only-keep-debug
Strip a file, removing contents of any sections that would not be stripped by --strip-debug and leavingthe debugging sections intact. In ELF files, this preserves all note sections in the output.Note - the section headers of the stripped sections are preserved, including their sizes, but the contentsof the section are discarded. The section headers are preserved so that other tools can match up thedebuginfo file with the real executable, even if that executable has been relocated to a different addressspace.The intention is that this option will be used in conjunction with --add-gnu-debuglink to create a twopart executable. One a stripped binary which will occupy less space in RAM and in a distribution and thesecond a debugging information file which is only needed if debugging abilities are required. Thesuggested procedure to create these files is as follows:1.<Link the executable as normal. Assuming that is is called>"foo" then...1.<Run "objcopy --only-keep-debug foo foo.dbg" to>create a file containing the debugging info.1.<Run "objcopy --strip-debug foo" to create a>stripped executable.1.<Run "objcopy --add-gnu-debuglink=foo.dbg foo">to add a link to the debugging info into the stripped executable.Note---the choice of ".dbg" as an extension for the debug info file is arbitrary. Also the
objcopy --only-keep-debug ...
--only-keep-debug"
1.<Link the executable as normal.>1.<Copy "foo" to "foo.full">1.<Run "objcopy --strip-debug foo">1.<Run "objcopy --add-gnu-debuglink=foo.full foo">i.e., the file pointed to by the --add-gnu-debuglink can be the full executable. It does not have to be afile created by the --only-keep-debug switch.Note---this switch is only intended for use on fully linked files. It does not make sense to use it onobject files where the debugging information may be incomplete. Besides the gnu_debuglink featurecurrently only supports the presence of one filename containing debugging information, not multiplefilenames on a one-per-object-file basis.
objcopy --only-keep-debug" ...
--strip-dwo
Remove the contents of all DWARF .dwo sections, leaving the remaining debugging sections and all symbolsintact. This option is intended for use by the compiler as part of the -gsplit-dwarf option, which splitsdebug information between the .o file and a separate .dwo file. The compiler generates all debuginformation in the same file, then uses the --extract-dwo option to copy the .dwo sections to the .dwofile, then the --strip-dwo option to remove those sections from the original .o file.
objcopy --strip-dwo ...
--extract-dwo
Extract the contents of all DWARF .dwo sections. See the --strip-dwo option for more information.
objcopy --extract-dwo ...
--file-alignment
Specify the file alignment. Sections in the file will always begin at file offsets which are multiples ofthis number. This defaults to 512. [This option is specific to PE targets.]
objcopy --file-alignment ...
--heap
Specify the number of bytes of memory to reserve (and optionally commit) to be used as heap for thisprogram. [This option is specific to PE targets.]
objcopy --heap ...
--image-base
Use value as the base address of your program or dll. This is the lowest memory location that will beused when your program or dll is loaded. To reduce the need to relocate and improve performance of yourdlls, each should have a unique base address and not overlap any other dlls. The default is 0x400000 forexecutables, and 0x10000000 for dlls. [This option is specific to PE targets.]
objcopy --image-base ...
--section-alignment
Sets the section alignment. Sections in memory will always begin at addresses which are a multiple ofthis number. Defaults to 0x1000. [This option is specific to PE targets.]
objcopy --section-alignment ...
--stack
Specify the number of bytes of memory to reserve (and optionally commit) to be used as stack for thisprogram. [This option is specific to PE targets.]
objcopy --stack ...
--subsystem
Specifies the subsystem under which your program will execute. The legal values for which are "native","windows", "console", "posix", "efi-app", "efi-bsd", "efi-rtd", "sal-rtd", and "xbox". You may optionallyset the subsystem version also. Numeric values are also accepted for which. [This option is specific toPE targets.]
objcopy --subsystem ...
--extract-symbol
Keep the file's section flags and symbols but remove all section data. Specifically, the option:*<removes the contents of all sections;>*<sets the size of every section to zero; and>*<sets the file's start address to zero.>This option is used to build a .sym file for a VxWorks kernel. It can also be a useful way of reducingthe size of a --just-symbols linker input file.
objcopy --extract-symbol ...
--compress-debug-sections
Compress DWARF debug sections using zlib with SHF_COMPRESSED from the ELF ABI. Note - if compressionwould actually make a section larger, then it is not compressed.
objcopy --compress-debug-sections ...
--decompress-debug-sections
Decompress DWARF debug sections using zlib. The original section names of the compressed sections arerestored.
objcopy --decompress-debug-sections ...
--elf-stt-common
For ELF files, these options control whether common symbols should be converted to the "STT_COMMON" or"STT_OBJECT" type. --elf-stt-common=yes converts common symbol type to "STT_COMMON". --elf-stt-common=noconverts common symbol type to "STT_OBJECT".
objcopy --elf-stt-common ...
--no-merge-notes
For ELF files, attempt (or do not attempt) to reduce the size of any SHT_NOTE type sections by removingduplicate notes.
objcopy --no-merge-notes ...
--version
Show the version number of objcopy.
objcopy --version ...
--verbose
Verbose output: list all object files modified. In the case of archives, objcopy -V lists all members ofthe archive.
objcopy --verbose ...
--help
Show a summary of the options to objcopy.
objcopy --help ...
--info
Display a list showing all architectures and object formats available.@fileRead command-line options from file. The options read are inserted in place of the original @file option.If file does not exist, or cannot be read, then the option will be treated literally, and not removed.Options in file are separated by whitespace. A whitespace character may be included in an option bysurrounding the entire option in either single or double quotes. Any character (including a backslash)may be included by prefixing the character to be included with a backslash. The file may itself containadditional @file options; any such options will be processed recursively.
objcopy --info ...