[patch] Add --compress-debug-sections option to gas

[Cary Coutant]

>> +@item --compress-debug-sections
>> +Compress DWARF debug sections using zlib.  The debug sections are renamed
>> +to begin with @samp{.zdebug}, and the resulting object file may not be
>> +compatible with older linkers and object file utilities.
>
> I think that you should mention that this feature is only available if the
> zlib library is available on the host machine.

More specifically, if it was available when gas was configured and
built, right? How should I phrase that? Or would the following be
sufficient?

"... If the zlib library is not available on the host machine, this
option has no effect."

-cary