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[rfc] using --with-sysroot for native builds

Matthias Klose doko@ubuntu.com
Fri Oct 29 14:42:00 GMT 2010 
On 29.10.2010 04:03, Alan Modra wrote:
> On Thu, Oct 28, 2010 at 05:23:23PM +0200, Matthias Klose wrote:
>> currently the --sysroot option for ld is only available if binutils
>> is configured --with-sysroot=<...>.  My use case for using sysroots
>> for native builds is having multiple chroots for different releases
>> of an OS available for testing, and not having to install a new
>> compiler/linker in the chroot itself. This basically works when
>> configuring --with-sysroot=/, but then libraries are searched in //
>> instead of /.
>>
>> The following patch makes the --sysroot option available to ld
>> independently of the configure option (making ld.bfd and ld.gold
>> consistent), and avoids the extra slash prefix.
>
> I think this should only be made available when native.  That's even
> what you said above and in $subject, but your patch makes a cross
> linker accept --sysroot.  Cross-linkers configured without a sysroot
> will not search the usual directories.

the attached patch makes this change in ldmain.c conditionally on native/cross. 
  An alternative would be to make the change unconditionally and let the 
configure fail for a cross build, if --with-sysroot is missing in the configure 
args, or if the value passed is `' or `/'.

   Matthias
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