strange OS dependent behavior of bfd_get_flavour()

[Peng Yu]

Hi,

#define PACKAGE 1
#define PACKAGE_VERSION 1
#include <bfd.h>
#include <stdio.h>

int main(int argc, char *argv[]) {
    bfd_init();
    bfd *bfd_h = bfd_openr(argv[1], 0);
    printf("bfd_get_flavour(bfd_h) = %d\n", bfd_get_flavour(bfd_h));
    bfd_close(bfd_h);
}


For the above C file, it returns the following on macOS.

$ ./main.exe test_file
bfd_get_flavour(bfd_h) = 17

But it returns the following macOS.

$ ./main.exe test_file
bfd_get_flavour(bfd_h) = 5

test_file is always the following
$ file test_file
test_file: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
statically linked, not stripped

The number 5 is bfd_target_elf_flavour.
The number 17 is bfd_target_mach_o_flavour.

This result seems to indicate bfd_get_flavour() returns the OS on
which it runs. I don't find the doc of bfd_get_flavour(). But
shouldn't it return the info about the input file to bfd_openr()?

https://sourceware.org/binutils/docs/bfd/index.html

This result is confusing to me. Could anybody clarify what is going on
here? Thanks.

-- 
Regards,
Peng