リナックスコマンド

man objcopy

objcopy(1) GNU Development Tools objcopy(1) 名前 objcopy - オブジェクトファイルのコピーや変換を行う 書式 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] [-L symbolname | --localize-symbol=symbolname] [-W symbolname | --weaken-symbol=symbolname] [-x | --discard-all] [-X | --discard-locals] [-b byte | --byte=byte] [-i interleave | --interleave=interleave] [-p | --preserve-dates] [--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] 説明 GNU objcopy ユーティリティはオブジェクトファイルの内容を別ファイルにコ ピーする。 objcopy はオブジェクトファイルの読み書きに GNU BFD ライブラ リを用いる。これによって書き込み先のファイルのオブジェクトフォーマット を読み込みファイルのフォーマットから変更することができる。 objcopy の詳 細な動作はコマンドラインオプションによって決定される。 objcopy は変換を行う際に一時ファイルを作成し、動作後にこれを消去する。 objcopy 変換作業はすべて BFD によって行われる。したがって BFD が種々の フォーマットに関して持っているすべての情報を利用することができ、明示し ないでもほとんどのフォーマットを認識できる。 objcopy はターゲットを srec に指定する (つまり -O srec とする) ことによ って S-record を生成することもできる。 objcopy は出力ターゲットを binary に指定する (つまり -O binary とする) ことによって raw バイナリファイルを生成することもできる。この際には、基 本的には入力オブジェクトファイルの内容のメモリダンプが作られる。メモリ ダンプは出力ファイルにコピーされる最抵位のセクションの仮想アドレスから スタートする。 S-record や raw バイナリファイルを生成する場合に -S を用いれば、デバッ グ情報を持つセクションを削除できる。また、バイナリファイルに不要な情報 を持ったセクションを消去するのに -R が役に立つ場合もある。 infile と outfile はそれぞれ入力・出力ファイルである。 outfile が指定さ れないと objcopy は一時ファイルを作成し、その結果を入力ファイルの名前に リネームする (すなわちもとの入力ファイルは破壊される)。 -I bfdname, --input-target=bfdname 入力ファイルのオブジェクトフォーマットを bfdname として取り扱う 。通常は自動的に認識する。 -O bfdname, --output-target=bfdname 出力ファイルのオブジェクトフォーマットを bfdname にする。 -F bfdname, --target=bfdname 入出力ファイルのオブジェクトフォーマットに bfdname を用いる。す なわち入力ファイルを変換せずに単に出力ファイルにコピーする。 -R sectionname, --remove-section=sectionname 指定したセクションをファイルから削除する。このオプションは複数回 指定することができる。このオプションを誤って用いると、出力ファイ ルが役立たずになる可能性がある。 -S, --strip-all リロケーション情報とシンボル情報を入力ファイルからコピーしない。 -g, --strip-debug デバッグシンボルを入力ファイルからコピーしない。 --strip-unneeded リロケーション処理に不要なシンボルをすべて取り去る。 -K symbolname, --keep-symbol=symbolname 入力ファイルから symbolname という名前のシンボルだけをコピーする 。複数回指定できる。 -N symbolname, --strip-symbol=symbolname 入力ファイルの symbolname という名前のシンボルをコピーしない。複 数回指定できる。 -L symbolname, --localize-symbol=symbolname symbolname をそのファイルにローカルなものにし、外部から見えない ようにする。複数回指定できる。 -W symbolname, --weaken-symbol=symbolname symbolname を weak にする。複数回指定できる。 -x, --discard-all 入力ファイルのグローバルでないシンボルはコピーしない。 -X, --discard-locals コンパイラが生成したローカルなシンボル (通常 "L" または "." では じまるシンボル) はコピーしない。 -b byte, --byte=byte 入力ファイルを interleave づつ区切った各セクションから byte バイ ト目だけをコピーする (ヘッダデータは影響されない)。 byte の範囲 は 0 から interleave-1 までである。 interleave の値は -i(また は--interleave) オプションで指定する。このオプションは ROM プロ グラム用のファイルを作成するときに便利である。出力ターゲット srec と共に用いられることが多い。 -i interleave, --interleave=interleave interleave バイトにつき 1 バイトづつをコピーする。デフォルトは 4 である。何番目のバイトをコピーするかは -b(または--byte ) オプシ ョンで指定する。 -b も --bytes も指定されなかった場合は interleave は無視される。 -p, --preserve-dates 出力ファイルのアクセス時刻と修正時刻を入力ファイルと同じにする。 --debugging 可能ならばデバッグ情報を変換する。このオプションはデフォルトには なっていない。すべてのデバッグフォーマットがサポートされているわ けではないし、この変換には時間がかかるからである。 --gap-fill=val セクション間のギャップを val で埋める。この動作はセクションの load address (LMA) に適用される。これはセクションのサイズを抵位 アドレスの分増やし、その余分を val で埋めることでなされる。 --pad-to=address 出力ファイルをロードアドレス address まで水増しする。これは最後 のセクションのサイズを増やすことでなされる。余分なスペースは --gap-fill で指定された値で埋められる (デフォルトは 0)。 --set-start=val 新しいファイルのスタートアドレスを val に設定する。すべてのオブ ジェクトファイルフォーマットでこの指定が可能ではないことに注意す ること。 --adjust-start=incr スタートアドレスを incr だけ増やす。すべてのオブジェクトファイル フォーマットでこの指定が可能ではないことに注意すること。 --adjust-vma=incr すべてのセクション (スタートアドレスも含まれる) のアドレスを incr だけ増やす。すべてのオブジェクトファイルフォーマットで任意 のアドレス設定が指定が可能なわけではないことに注意すること。また このオプションではそれぞれのセクションがロードされるアドレスを変 えてしまうので、プログラムが動かなくなる可能性がある --adjust-section-vma=section{=,+,-}val 名前が section のセクションのアドレスを設定する。 = が用いられた 場合はセクションのアドレスは val にされる。それ以外の場合はセク ションのアドレスから val が増減される。上記の --adjust-vma に関 するコメントを参照のこと。 section が入力ファイルに存在しない場 合は警告グメッセージが表示される (ただし --no-adjust-warning が 指定されていたら表示しない)。 --adjust-warnings --adjust-section-vma が指定されているとき、対象となるセクション が存在しなければ警告メッセージを表示する。デフォルトの動作である 。 --no-adjust-warnings --adjust-section-vma が指定されているとき、かつ対象となるセクシ ョンが存在していなくても警告メッセージを表示しない。 --set-section-flags=section=flags 指定したセクションのフラグを設定する。引数 flags はコンマ (,) で 区切られたフラグ文字列である。認識される文字列は alloc、 load、 readonly、 code、 data、 rom である。すべてのフラグがあらゆるフ ォーマットで有効なわけではないことに注意すること。 --add-section=sectionname=filename ファイルをコピーするときに sectionname という名前のセクションを 追加する。この新しいセクションの内容はファイル filename から取ら れる。このオプションが機能するのは、任意のセクション名をサポート しているフォーマットだけである。 --change-leading-char オブジェクトファイルのフォーマットによっては、シンボル名の先頭に 特定の文字を使っている場合がある。よくある例はアンダースコア (_) で、これはコンパイラがすべてのシンボル名に前置する。このオプショ ンを指定すると objcopy はフォーマット変換の際にすべてのシンボル における先頭文字を変更しようとする。同じ先頭文字を持つオブジェク ト間では、このオプションは意味を持たない。異なる場合は、場合に応 じて先頭文字が追加されたり削除、変更されたりする。 --remove-leading-char グローバルシンボルの先頭文字がオブジェクトファイルに特有のもので あった場合、これを削除する。通常はアンダースコア (_) がこれにあ たる。このオプションはすべてのグローバルシンボルから先頭にあるア ンダースコアを削除する。これは (シンボル名の命名流儀が異なる) 複 数のフォーマットに属するオブジェクト群を同時にリンクする場合に有 用である。このオプションは --change-leading-char とは異なる。後 者では出力のフォーマットにかかわらず、該当したケースではすべて変 更が行われる。 --weaken ファイルのすべての global なシンボルを weak に変更する。 -v, --verbose 詳細出力モード。修正されたすべてのオブジェクトファイルをリストす る。書庫の場合は"objcopy -V" とすると書庫のすべてのメンバーを表 示する。 -V, --version objcopy のバージョン番号を表示して終了する。 --help objcopy のオプションの要約を表示して終了する。 関連項目 info の ‘ binutils ’ エントリ、 The GNU Binary Utilities, Roland H. Pesch (June 1993)、 著作権 Copyright (c) 1993, 94, 95, 96, 1997 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)

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] [-B bfdarch|--binary-architecture=bfdarch] [-S|--strip-all] [-g|--strip-debug] [-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 interleave|--interleave=interleave] [-j sectionname|--only-section=sectionname] [-R sectionname|--remove-section=sectionname] [-p|--preserve-dates] [--debugging] [--gap-fill=val] [--pad-to=address] [--set-start=val] [--adjust-start=incr] [--change-addresses=incr] [--change-section-address section{=,+,-}val] [--change-section-lma section{=,+,-}val] [--change-section-vma section{=,+,-}val] [--change-warnings] [--no-change-warnings] [--set-section-flags section=flags] [--add-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] [--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] [--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] [-v|--verbose] [-V|--version] [--help] [--info] 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. Note that objcopy should be able to copy a fully linked file between any two formats. However, copying a relocatable object file between any two formats may not work as expected. objcopy creates temporary files to do its translations and deletes them afterward. objcopy uses BFD to do all its translation work; it has access to all the formats described in BFD 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 load 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 that is not needed by the binary file. Note---objcopy is not able to change the endianness of its input files. If the input format has an endianness (some formats do not), objcopy can only copy the inputs into file formats that have the same endianness or which have no endianness (e.g., srec). (However, see the --reverse-bytes option.) OPTIONS infile outfile The input and output files, respectively. If you do not specify outfile, objcopy creates a temporary file and destructively renames the result with the name of infile. -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. -B bfdarch --binary-architecture=bfdarch Useful when transforming a architecture-less input file into an object file. In this case the output architecture 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 by the 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 in your code using these symbols. -j sectionname --only-section=sectionname Copy only the named section from the input file to the output file. This option may be given more than once. Note that using this option inappropriately may make the output file unusable. -R sectionname --remove-section=sectionname Remove any section named sectionname from the output 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 or sections from the source file. --strip-unneeded Strip all symbols that are not needed for relocation processing. -K symbolname --keep-symbol=symbolname When stripping symbols, keep symbol symbolname even if it would normally be stripped. 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. --strip-unneeded-symbol=symbolname Do not copy symbol symbolname from the source file unless it is needed by a relocation. This option may be given more than once. -G symbolname --keep-global-symbol=symbolname Keep only symbol symbolname global. Make all other symbols local to the file, so that they are not visible externally. This option may be given more than once. --localize-hidden In an ELF object, mark all symbols that have hidden or internal visibility as local. This option applies on top of symbol-specific localization options such as -L. -L symbolname --localize-symbol=symbolname Make symbol symbolname local to the file, so that it is not visible externally. This option may be given more than once. -W symbolname --weaken-symbol=symbolname Make symbol symbolname weak. This option may be given more than once. --globalize-symbol=symbolname 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. -w --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 is reversed for that symbol. For example: -w -W !foo -W fo* would cause objcopy to weaken all symbols that start with "fo" except for the symbol "foo". -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 interleave-1, where interleave is given by the -i or --interleave option, or the default of 4. This option is useful for creating files to program ROM. It is typically used with an "srec" output target. -i interleave --interleave=interleave Only copy one out of every interleave bytes. Select which byte to copy with the -b or --byte option. The default is 4. objcopy ignores this option if you do not specify either -b or --byte. -p --preserve-dates Set the access and modification dates of the output file to be the same as those of the input file. --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 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 space created with val. --pad-to address Pad the output file up to the load 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. --change-start incr --adjust-start incr Change the start address by adding incr. Not all object file formats support setting the start address. --change-addresses incr --adjust-vma incr Change the VMA and LMA addresses 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. --change-section-address section{=,+,-}val --adjust-section-vma section{=,+,-}val Set or change both the VMA address and the LMA 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 --change-addresses, above. If section does not exist in the input file, a warning will be issued, unless --no-change-warnings is used. --change-section-lma section{=,+,-}val Set or change the LMA address of the named section. The LMA address is the address where the section will be loaded into memory at program load time. Normally this is the same as the VMA address, which is the address of the section at program run time, but on some systems, especially those where a program is held in ROM, the two can be different. 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 --change-addresses, above. If section does not exist in the input file, a warning will be issued, unless --no-change-warnings is used. --change-section-vma section{=,+,-}val Set or change the VMA address of the named section. The VMA address is the address where the section will be located once the program has started executing. Normally this is the same as the 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 section address is set to val. Otherwise, val is added to or subtracted from the section address. See the comments under --change-addresses, above. If section does not exist in the input file, a warning will be issued, unless --no-change-warnings is used. --change-warnings --adjust-warnings If --change-section-address or --change-section-lma or --change-section-vma is used, and the named section does not exist, issue a warning. This is the default. --no-change-warnings --no-adjust-warnings Do not issue a warning if --change-section-address or --adjust-section-lma or --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, contents, load, noload, readonly, code, data, rom, share, and debug. You can set the contents flag for a section which does not have contents, but it is not meaningful to clear the contents flag of a section which does have contents--just remove the section instead. 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. --rename-section oldname=newname[,flags] Rename a section from oldname to newname, optionally changing the section’s flags to flags in the process. This has the advantage over usng a linker script to perform the rename in that the output stays as an object file and does not become a linked executable. This option is particularly helpful when the input format is binary, since this will always create a section called .data. If for example, you wanted instead to create a section called .rodata containing binary data you could use the following command line to achieve it: objcopy -I binary -O -B \ --rename-section .data=.rodata,alloc,load,readonly,data,contents \ --long-section-names {enable,disable,keep} Controls the handling of long section names when processing "COFF" and "PE-COFF" object formats. The default behaviour, keep, is to preserve long section names if any are present in the input file. The enable 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 enable option will only emit long section names if any are present in the inputs; this is mostly the same as keep, but it is left undefined whether the enable option might force the creation of an empty string table in the output file. --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 --change-leading-char because it always changes the symbol name when appropriate, regardless of the object file format of the output file. --reverse-bytes=num Reverse the bytes in a section with output contents. A section length must be evenly divisible by the value given in order for the swap to be able to take place. Reversing takes place before the interleaving is performed. This option is used typically in generating ROM images for problematic target systems. For example, on some target boards, the 32-bit words fetched from 8-bit ROMs are re-assembled in little-endian byte order regardless of the CPU byte order. Depending on the programming model, the endianness of the ROM may need to 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, the bytes in the second output file would be ordered 34127856. --srec-len=ival Meaningful only for srec output. Set the maximum length of the Srecords being produced to ival. This length covers both address, data and crc fields. --srec-forceS3 Meaningful only for srec output. Avoid generation of S1/S2 records, creating S3-only record format. --redefine-sym old=new Change the name of a symbol old, to new. This can be useful when one is trying link two things together for which you have no source, and there are name collisions. --redefine-syms=filename Apply --redefine-sym to each symbol pair "old new" listed in the file filename. filename is simply a flat file, with one symbol pair per line. Line comments may be introduced by the hash character. This option may be given more than once. --weaken Change all global symbols in the file to be weak. This can be useful when building an object which will be linked against other objects using the -R option to the linker. This option is only effective when using an object file format which supports weak symbols. --keep-symbols=filename 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 be given more than once. --strip-symbols=filename 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 be given more than once. --strip-unneeded-symbols=filename Apply --strip-unneeded-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 be given more than once. --keep-global-symbols=filename Apply --keep-global-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 be given more than once. --localize-symbols=filename Apply --localize-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 be given more than once. --globalize-symbols=filename Apply --globalize-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 be given more than once. --weaken-symbols=filename 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 be given more than once. --alt-machine-code=index 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, but other applications still depend on the original code being used. For ELF based architectures if the index alternative does not exist then the value is treated as an absolute number to be stored in the e_machine field of the ELF header. --writable-text Mark the output text as writable. This option isn’t meaningful for all object file formats. --readonly-text Make the output text write protected. This option isn’t meaningful for all object file formats. --pure Mark the output file as demand paged. This option isn’t meaningful for all object file formats. --impure Mark the output file as impure. This option isn’t meaningful for all object file formats. --prefix-symbols=string Prefix all symbols in the output file with string. --prefix-sections=string Prefix all section names in the output file with string. --prefix-alloc-sections=string Prefix all the names of all allocated sections in the output file with string. --add-gnu-debuglink=path-to-file Creates a .gnu_debuglink section which contains a reference to path-to-file and adds it to the output file. --keep-file-symbols When stripping a file, perhaps with --strip-debug or --strip-unneeded, retain any symbols specifying source file names, which would otherwise get stripped. --only-keep-debug Strip a file, removing contents of any sections that would not be stripped by --strip-debug and leaving the debugging sections intact. In ELF files, this preserves all note sections in the output. The intention is that this option will be used in conjunction with --add-gnu-debuglink to create a two part executable. One a stripped binary which will occupy less space in RAM and in a distribution and the second a debugging information file which is only needed if debugging abilities are required. The suggested procedure to create these files is as follows: 1. "foo" then... 1. create a file containing the debugging info. 1. stripped executable. 1. 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 "--only-keep-debug" step is optional. You could instead do this: 1. 1. 1. 1. i.e., the file pointed to by the --add-gnu-debuglink can be the full executable. It does not have to be a file 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 on object files where the debugging information may be incomplete. Besides the gnu_debuglink feature currently only supports the presence of one filename containing debugging information, not multiple filenames on a one- per-object-file basis. --file-alignment num Specify the file alignment. Sections in the file will always begin at file offsets which are multiples of this number. This defaults to 512. [This option is specific to PE targets.] --heap reserve --heap reserve,commit Specify the number of bytes of memory to reserve (and optionally commit) to be used as heap for this program. [This option is specific to PE targets.] --image-base value Use value as the base address of your program or dll. This is the lowest memory location that will be used when your program or dll is loaded. To reduce the need to relocate and improve performance of your dlls, each should have a unique base address and not overlap any other dlls. The default is 0x400000 for executables, and 0x10000000 for dlls. [This option is specific to PE targets.] --section-alignment num Sets the section alignment. Sections in memory will always begin at addresses which are a multiple of this number. Defaults to 0x1000. [This option is specific to PE targets.] --stack reserve --stack reserve,commit Specify the number of bytes of memory to reserve (and optionally commit) to be used as stack for this program. [This option is specific to PE targets.] --subsystem which --subsystem which:major --subsystem which:major.minor 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 optionally set the subsystem version also. Numeric values are also accepted for which. [This option is specific to PE targets.] --extract-symbol Keep the file’s section flags and symbols but remove all section data. Specifically, the option: * * * This option is used to build a .sym file for a VxWorks kernel. It can also be a useful way of reducing the size of a --just-symbols linker input file. -V --version Show the version number of objcopy. -v --verbose Verbose output: list all object files modified. In the case of archives, objcopy -V lists all members of the archive. --help Show a summary of the options to objcopy. --info Display a list showing all architectures and object formats available. @file Read 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 by surrounding 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 contain additional @file options; any such options will be processed recursively. SEE ALSO ld(1), objdump(1), and the Info entries for binutils. COPYRIGHT Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". binutils-2.20.51.0.2 2019-02-26 OBJCOPY(1)