Use stub bfd for dynobj

[Alan Modra]

On Wed, Aug 19, 2026 at 04:30:42PM +0200, Andreas Schwab wrote:
> I'm getting a failure of ld-bootstrap on aarch64:
> 
> Executing on host: sh -c {gcc -B/opt/test/binutils/test/ld/tmpdir/gccld1/   -L/usr/aarch64-unknown-linux-gnu/lib64 -L/usr/lib64 -L/usr/local/lib64 -L/lib64 -L/usr/aarch64-unknown-linux-gnu/lib -L/usr/local/lib -L/lib -L/usr/lib     -o tmpdir/ld2 -O2 -g   -Wl,--traditional-format ldgram.o ldlex-wrapper.o lexsup.o ldlang.o mri.o ldctor.o ldmain.o plugin.o ldwrite.o ldexp.o  ldemul.o ldver.o ldmisc.o ldfile.o ldcref.o eaarch64linux.o eaarch64linuxb.o eaarch64linux32.o eaarch64linux32b.o earmelfb_linux_eabi.o earmelf_linux_eabi.o eaarch64elf.o eaarch64elf32.o eaarch64elf32b.o eaarch64elfb.o earmelf.o earmelfb.o ldelf.o ldelfgen.o ldbuildid.o ../libctf/.libs/libctf.a -lz ../bfd/.libs/libbfd.a ../libiberty/libiberty.a  ../libsframe/.libs/libsframe.a  -lz -lzstd -ldl 2>&1}  /dev/null ld.tmp (timeout = 300)
> spawn [open ...]
> collect2: fatal error: ld terminated with signal 4 [Illegal instruction], core dumped
> compilation terminated.
> collect2: fatal error: ld terminated with signal 4 [Illegal instruction], core dumped
> compilation terminated.
> 
> FAIL: bootstrap with -Wl,--traditional-format

I don't doubt you but cfarm107 gives me a PASS here.  So it might take
me a little while to track this down.

-- 
Alan Modra