Weird issue with objcopy --add-gnu-debuglink

[Nezmer]

Hi,

I'm having a weird issue with objcopy.

Running:
FreeBSD 8-STABLE
binutils git 1160cb53d1f7605d
gcc 4.5.20101028


I run for example:

${OBJCOPY} --only-keep-debug strip strip.dbg
${OBJCOPY} --add-gnu-debuglink=strip.dbg /usr/home/user/dir/binutils/pkg/binutils/usr/local/bin/strip


And get this error:
/usr/local/lib/gcc45/gcc/x86_64-unknown-freebsd8.1/4.5.2/../../../../../x86_64-unknown-freebsd8.1/bin/objcopy:/usr/home/user/dir/binutils/pkg/binutils/usr/local/bin/stAa5Vkh:
cannot create debug link section `strip.dbg': Invalid operation

This error is occurring quite often. Any idea why?