Proposed changes for pdp11 --*magic options

[Paul Koning]

> On Apr 7, 2020, at 6:06 AM, Nick Clifton via Binutils <binutils@sourceware.org> wrote:
> 
> ...
>> FAIL: ld-scripts/pr18963
>> 
>> This one is more complicated.  Starting with data.o consisting on only
>> a header and zero-length text, data and bss the linker script creates
>> sections that are each 0x10000 long with symbols corresponding to the
>> section addresses just to test whether addition is commutative using
>> those symbols.  The output generated by that linker script is much
>> larger than indicated by the a.out header (and several times larger
>> than the 16-bit address space) making the format invalid, so nm gives
>> an error.  Unless the test could be implemented with sections created
>> in the object file and just have the symbols defined in the linker
>> script based on those sections, this test is not supported for
>> pdp11-aout.
> 
> This sounds like a reasonable case for an xfail, with a comment along
> the lines of "this test creates a binary that is too big for 16-bit architectures".

The GCC test machinery has notation that lets you mark a test case as not supported on 16 bit machines, so it is simply skilled there.  Does binutils have that same mechanism, or something like it?

	paul