[U-Boot] [PATCH 5/7] powerpc: Minimal private libgcc to build on Debian

[Moffett, Kyle D]

On Feb 21, 2011, at 16:23, Wolfgang Denk wrote:
> In message <1298311199-18775-6-git-send-email-Kyle.D.Moffett at boeing.com> you wrote:
>> Standard Debian powerpc and powerpcspe systems only include hard-float
>> libgcc in their native compilers, which causes scary build warnings when
>> building U-Boot.
>> 
>> The easiest way to resolve this is to borrow the routines that U-Boot
>> needs from the Linux kernel (GPLv2-licensed), which has the same issue.
> 
> Actually the code says "either version 2 of the License, or (at your
> option) any later version", as far as I can tell ?

Ah, sorry, I dropped the "+" in there somehow.  Will fix.


>> Specifically, the routines are: _ashldi3(), _ashrdi3(), and _lshrdi3().
> 
> We have been building for years on such systems, and I don;t remember
> that such issues have been reprted before for Power Architecture
> systems (I remember only ARM to have such issues).

Debian/RedHat used to build "nof" libraries, but they were almost completely unused and several major bugs went unnoticed for a while.  Furthermore, they took a lot of time to build and they basically did not get used.

Eventually it was decided to just remove the "nof" (soft-float) libgcc, etc.

It's not actually fatal right now, because the 3 routines that it pulls from hard-float libgcc don't use floating point (you just get a nasty warning).  The problem is that if somebody were to accidentally use one of the hard-float-based routines in U-Boot I would unexpectedly get indeterminate results instead of compile errors.


> Please also follow the rules when copying code from Linux - provide
> exact reference; see bullet # 4 at
> http://www.denx.de/wiki/view/U-Boot/Patches#Attributing_Code_Copyrights_Sign

Will fix, thanks!

Cheers,
Kyle Moffett
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 6686 bytes
Desc: not available
Url : http://lists.denx.de/pipermail/u-boot/attachments/20110221/0fd7b44a/attachment.bin