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

From: nickc at redhat dot com
Subject: [Bug ld/21251] Support $SYSROOT in ld -L and INPUT command
Date: Wed, 24 May 2017 13:42:38 +0000


--- Comment #6 from Nick Clifton <nickc at redhat dot com> ---
Hi Rainer,

>> 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. 

If you mean, "where does this information come from ?"  The have a look in

> 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 '='
then library search paths should be able to as well.


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