[Bug ld/21251] Support $SYSROOT in ld -L and INPUT command

[ro at CeBiTec dot Uni-Bielefeld.DE]

https://sourceware.org/bugzilla/show_bug.cgi?id=21251

--- Comment #7 from Rainer Orth <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #6 from Nick Clifton <nickc at redhat dot com> ---
Hi Nick,

>>> Hmm, I was going to say not a lot, but then I remembered that GCC uses it:
>>>
>>>    https://gcc.gnu.org/onlinedocs/gcc/Directory-Options.html
>> 
>> Maybe I'm blind, but where did you see that?
>
> Umm, do you mean "where in that web page do I see an '=' prefix being used
> to indicate that a sysroot should be used ?"  Then, right at the start:
>
>   -idirafter dir
>
>   Add the directory dir to the list of directories to be searched 
>   for header files during preprocessing. If dir begins with  ‘=’, 
>   then the ‘=’ is replaced by the sysroot prefix; see --sysroot and 
> -isysroot. 

ah, silly me, I just thought to look at -L and friends.

>> I'd have been surprised to find pure linker option descriptions repeated
>> in the GCC manual, so I didn't even think to look.
>
> Well to be honest it is talking about the c-preprocessor include path options
> rather than the linker search path, but I think that it establishes a 
> principle
> which users will expect to be followed.  IE if include paths can use a '='
> prefix
> then library search paths should be able to as well.

Indeed, everything else would be just confusing.  This pretty much rules
out deprecating '=' in either gld or gcc, obviously.

I'll look into supporting $SYSROOT in gcc for symmetry, but that's about it.

Thanks for your patience ;-)

        Rainer

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