https://sourceware.org/bugzilla/show_bug.cgi?id=24968
Bug ID: 24968
Summary: objcopy: -B is not useful
Product: binutils
Version: 2.33 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: maskray at google dot com
Target Milestone: ---
objcopy -I binary -O elf64-x86-64 a.txt b # e_machine is
EM_NONE
objcopy -I binary -B i386:x86-64 -O elf64-x86-64 a.txt c # e_machine is
EM_X86_64
cmp -l b c # one byte
difference: 19 0 76
objcopy -I ihex -O elf64-x86-64 a.hex b.o # e_machine is
EM_NONE
objcopy -I ihex -B i386:x86-64 -O elf64-x86-64 a.hex b.o # e_machine is
EM_X86_64
cmp -l b c # one byte
difference: 19 0 76
aarch64/binutils/objcopy -I binary -O elf64-littleaarch64 a.txt b; file b
a.o: ELF 64-bit LSB relocatable, no machine, version 1 (SYSV), not stripped
This means when -I binary is used, both -O and -B have to be specified.
The e_machine information "i386:x86-64" can be inferred from elf64-x86-64.
So is it possible to ignore -B and let `objcopy -I binary -O elf*` create an
object file with e_machine set? This will not break existing use cases.
There is a precedent that ignores -B, elftoolchain elfcopy
case 'B':
/* ignored */
break;
...
case 'I':
case 's':
set_input_target(ecp, optarg);
break;
...
case 'O':
set_output_target(ecp, optarg);
break;
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