sys-devel/binutilsのmultitargetUSEフラグを有効にする．
sudo euse -E multitarget -p sys-devel/binutils
objcopy --helpのターゲット一覧にはなぜか登場しないが，コマンドは成功する．つまり，--target=efi-app-x86_64を指定できる．
> objcopy --help
使用法: objcopy [option(s)] in-file [out-file]
バイナリファイルをコピーします。場合によっては処理中に形式を変換します。
オプション:
-I --input-target <bfdname> Assume input file is in format <bfdname>
-O --output-target <bfdname> Create an output file in format <bfdname>
-B --binary-architecture <arch> Set output arch, when input is arch-less
-F --target <bfdname> Set both input and output format to <bfdname>
--debugging Convert debugging information, if possible
-p --preserve-dates Copy modified/access timestamps to the output
-D --enable-deterministic-archives
Produce deterministic output when stripping archives
-U --disable-deterministic-archives
Disable -D behavior (default)
-j --only-section <name> Only copy section <name> into the output
--add-gnu-debuglink=<file> Add section .gnu_debuglink linking to <file>
-R --remove-section <name> Remove section <name> from the output
--remove-relocations <name> Remove relocations from section <name>
-S --strip-all Remove all symbol and relocation information
-g --strip-debug Remove all debugging symbols & sections
--strip-dwo Remove all DWO sections
--strip-unneeded Remove all symbols not needed by relocations
-N --strip-symbol <name> Do not copy symbol <name>
--strip-unneeded-symbol <name>
Do not copy symbol <name> unless needed by
relocations
--only-keep-debug Strip everything but the debug information
--extract-dwo Copy only DWO sections
--extract-symbol Remove section contents but keep symbols
--keep-section <name> Do not strip section <name>
-K --keep-symbol <name> Do not strip symbol <name>
--keep-file-symbols Do not strip file symbol(s)
--localize-hidden Turn all ELF hidden symbols into locals
-L --localize-symbol <name> Force symbol <name> to be marked as a local
--globalize-symbol <name> Force symbol <name> to be marked as a global
-G --keep-global-symbol <name> Localize all symbols except <name>
-W --weaken-symbol <name> Force symbol <name> to be marked as a weak
--weaken Force all global symbols to be marked as weak
-w --wildcard Permit wildcard in symbol comparison
-x --discard-all Remove all non-global symbols
-X --discard-locals Remove any compiler-generated symbols
-i --interleave[=<number>] Only copy N out of every <number> bytes
--interleave-width <number> Set N for --interleave
-b --byte <num> Select byte <num> in every interleaved block
--gap-fill <val> Fill gaps between sections with <val>
--pad-to <addr> Pad the last section up to address <addr>
--set-start <addr> Set the start address to <addr>
{--change-start|--adjust-start} <incr>
Add <incr> to the start address
{--change-addresses|--adjust-vma} <incr>
Add <incr> to LMA, VMA and start addresses
{--change-section-address|--adjust-section-vma} <name>{=|+|-}<val>
Change LMA and VMA of section <name> by <val>
--change-section-lma <name>{=|+|-}<val>
Change the LMA of section <name> by <val>
--change-section-vma <name>{=|+|-}<val>
Change the VMA of section <name> by <val>
{--[no-]change-warnings|--[no-]adjust-warnings}
Warn if a named section does not exist
--set-section-flags <name>=<flags>
Set section <name>'s properties to <flags>
--set-section-alignment <name>=<align>
Set section <name>'s alignment to <align> bytes
--add-section <name>=<file> Add section <name> found in <file> to output
--update-section <name>=<file>
Update contents of section <name> with
contents found in <file>
--dump-section <name>=<file> Dump the contents of section <name> into <file>
--rename-section <old>=<new>[,<flags>] Rename section <old> to <new>
--long-section-names {enable|disable|keep}
Handle long section names in Coff objects.
--change-leading-char Force output format's leading character style
--remove-leading-char Remove leading character from global symbols
--reverse-bytes=<num> Reverse <num> bytes at a time, in output sections with content
--redefine-sym <old>=<new> Redefine symbol name <old> to <new>
--redefine-syms <file> --redefine-sym for all symbol pairs
listed in <file>
--srec-len <number> Restrict the length of generated Srecords
--srec-forceS3 Restrict the type of generated Srecords to S3
--strip-symbols <file> -N for all symbols listed in <file>
--strip-unneeded-symbols <file>
--strip-unneeded-symbol for all symbols listed
in <file>
--keep-symbols <file> -K for all symbols listed in <file>
--localize-symbols <file> -L for all symbols listed in <file>
--globalize-symbols <file> --globalize-symbol for all in <file>
--keep-global-symbols <file> -G for all symbols listed in <file>
--weaken-symbols <file> -W for all symbols listed in <file>
--add-symbol <name>=[<section>:]<value>[,<flags>] Add a symbol
--alt-machine-code <index> Use the target's <index>'th alternative machine
--writable-text Mark the output text as writable
--readonly-text Make the output text write protected
--pure Mark the output file as demand paged
--impure Mark the output file as impure
--prefix-symbols <prefix> Add <prefix> to start of every symbol name
--prefix-sections <prefix> Add <prefix> to start of every section name
--prefix-alloc-sections <prefix>
Add <prefix> to start of every allocatable
section name
--file-alignment <num> Set PE file alignment to <num>
--heap <reserve>[,<commit>] Set PE reserve/commit heap to <reserve>/
<commit>
--image-base <address> Set PE image base to <address>
--section-alignment <num> Set PE section alignment to <num>
--stack <reserve>[,<commit>] Set PE reserve/commit stack to <reserve>/
<commit>
--subsystem <name>[:<version>]
Set PE subsystem to <name> [& <version>]
--compress-debug-sections[={none|zlib|zlib-gnu|zlib-gabi}]
Compress DWARF debug sections using zlib
--decompress-debug-sections Decompress DWARF debug sections using zlib
--elf-stt-common=[yes|no] Generate ELF common symbols with STT_COMMON
type
--verilog-data-width <number> Specifies data width, in bytes, for verilog output
-M --merge-notes Remove redundant entries in note sections
--no-merge-notes Do not attempt to remove redundant notes (default)
-v --verbose List all object files modified
@<file> Read options from <file>
-V --version Display this program's version number
-h --help Display this output
--info List object formats & architectures supported
objcopy: サポートされているターゲット: elf64-x86-64 elf32-bigaarch64 elf32-littleaarch64 elf64-bigaarch64 elf64-bigaarch64-cloudabi elf64-littleaarch64 elf64-littleaarch64-cloudabi mach-o-arm64 ecoff-littlealpha elf64-alpha elf64-alpha-freebsd vms-alpha vms-libtxt elf32-am33lin elf32-bigarc elf32-littlearc elf32-bigarm elf32-littlearm elf32-bigarm-fdpic elf32-littlearm-fdpic elf32-bigarm-symbian elf32-littlearm-symbian elf32-bigarm-vxworks elf32-littlearm-vxworks mach-o-arm pe-arm-big pe-arm-little pe-arm-wince-big pe-arm-wince-little pei-arm-big pei-arm-little pei-arm-wince-big pei-arm-wince-little elf32-avr elf32-bfin elf32-bfinfdpic elf32-cr16 a.out-cris elf32-cris elf32-us-cris elf32-crx elf32-csky-big elf32-csky-little elf32-d10v elf32-d30v elf32-dlx elf32-big elf32-little elf64-big elf64-little elf32-epiphany elf32-fr30 elf32-frv elf32-frvfdpic elf32-h8300 elf32-h8300-linux elf32-hppa elf32-hppa-linux elf32-hppa-netbsd elf64-hppa elf64-hppa-linux som a.out-i386 a.out-i386-bsd a.out-i386-lynx coff-i386 coff-go32 coff-go32-exe coff-i386-lynx elf32-i386 elf32-i386-freebsd elf32-i386-sol2 elf32-i386-vxworks mach-o-i386 msdos pe-i386 pe-bigobj-i386 pei-i386 elf32-iamcu elf64-bpfbe elf64-bpfle elf32-ia64-hpux-big elf64-ia64-big elf64-ia64-little elf64-ia64-hpux-big elf64-ia64-vms pei-ia64 elf32-ip2k elf32-iq2000 elf64-k1om elf64-k1om-freebsd elf64-l1om elf64-l1om-freebsd elf32-lm32 elf32-m32c elf32-m32r elf32-m32rle elf32-m32r-linux elf32-m32rle-linux elf32-m68hc11 elf32-m68hc12 elf32-m68k elf32-s12z mach-o-be mach-o-le mach-o-fat elf32-mcore-big elf32-mcore-little pe-mcore-big pe-mcore-little pei-mcore-big pei-mcore-little elf32-mep elf32-metag elf32-microblaze ecoff-bigmips ecoff-littlemips ecoff-biglittlemips elf32-bigmips elf32-littlemips elf32-nbigmips elf32-nlittlemips elf32-ntradbigmips elf32-ntradlittlemips elf32-ntradbigmips-freebsd elf32-ntradlittlemips-freebsd elf32-tradbigmips elf32-tradlittlemips elf32-tradbigmips-freebsd elf32-tradlittlemips-freebsd elf32-bigmips-vxworks elf32-littlemips-vxworks elf64-bigmips elf64-littlemips elf64-tradbigmips elf64-tradlittlemips elf64-tradbigmips-freebsd elf64-tradlittlemips-freebsd elf64-mmix mmo elf32-mn10200 elf32-mn10300 elf32-bigmoxie elf32-littlemoxie elf32-msp430 elf32-msp430 elf32-mt elf32-nds32be elf32-nds32le elf32-nds32be-linux elf32-nds32le-linux elf64-nfp elf32-bignios2 elf32-littlenios2 a.out-pc532-mach a.out-ns32k-netbsd elf32-or1k a.out-pdp11 pef pef-xlib elf32-pj elf32-pjl ppcboot elf32-powerpc elf32-powerpcle elf32-powerpc-freebsd elf32-powerpc-vxworks elf64-powerpc elf64-powerpcle elf64-powerpc-freebsd pe-powerpc pe-powerpcle pei-powerpc pei-powerpcle elf32-pru elf32-littleriscv elf64-littleriscv elf32-rl78 aixcoff64-rs6000 aix5coff64-rs6000 aixcoff-rs6000 elf32-rx-be elf32-rx-be-ns elf32-rx-le elf32-s390 elf64-s390 elf32-bigscore elf32-littlescore coff-sh coff-shl coff-sh-small coff-shl-small elf32-sh elf32-shl elf32-shbig-fdpic elf32-sh-fdpic elf32-sh-linux elf32-shbig-linux elf32-sh-nbsd elf32-shl-nbsd elf32-sh-vxworks elf32-shl-vxworks pe-shl pei-shl elf32-sparc elf32-sparc-sol2 elf32-sparc-vxworks elf64-sparc elf64-sparc-freebsd elf64-sparc-sol2 elf32-spu sym coff-tic30 coff0-beh-c54x coff0-c54x coff1-beh-c54x coff1-c54x coff2-beh-c54x coff2-c54x elf32-tic6x-be elf32-tic6x-le elf32-tilegx-be elf32-tilegx-le elf64-tilegx-be elf64-tilegx-le elf32-tilepro elf32-ft32 elf32-v850-rh850 elf32-v850 a.out-vax1k-netbsd a.out-vax-netbsd elf32-vax elf32-visium wasm elf32-wasm32 coff-x86-64 elf32-x86-64 elf64-x86-64-cloudabi elf64-x86-64-freebsd elf64-x86-64-sol2 mach-o-x86-64 pe-x86-64 pe-bigobj-x86-64 pei-x86-64 elf32-xc16x elf32-xgate elf32-xstormy16 elf32-xtensa-be elf32-xtensa-le coff-z80 elf32-z80 coff-z8k srec symbolsrec verilog tekhex binary ihex plugin
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