Failure while building powerpc-unknown-linux-gnu

[Andy Gibbs]

On Wednesday, July 21, 2010 5:31 PM, Peter Wippich wrote:


> The strange thing is that I can build the toolchain for gcc 4.4.x, but 
> this toolchain does not work for me. It compiles the kernel but user space 
> stuff (busybox) is crashing at runtime when I use it.
>
> Anybody has any hints what's going wrong here ??

I'm afraid I don't have any specific hints regarding a 4.3 version of gcc 
since for my 603e platform I am using 4.4.4, which after a couple of false 
starts has compiled and is running fine.

Are you using buildroot for your user space applications?  There are some 
problems with it (at least there are in the 2010.05 version).  In 
particular, in terms of sstrip and ldconfig.

First up, I'd recommend never to use sstrip: use the standard strip instead. 
I've found sstrip to be very broken on the 603e.  I haven't checked the 
source code to sstrip, but I wouldn't be surprised if it is little-endian 
only!

Secondly, if you are using buildroot, then you need to remove the 
/etc/ld.so.cache file that it creates and create it again on your target 
hardware using the ldconfig compiled as part of crosstool.  Also, when using 
buildroot, you might want to check that it does copy all the relevant 
libraries across from the crosstool build folder to the target directories. 
It already copies everything across to the buildroot staging folder, but 
some things get missed in the copy to the target folder structure.

Lastly, in terms of busybox, then there is a problem with strict aliasing, 
so you will need to set the -fno-strict-aliasing flag when compiling busybox 
(if you search the buildroot mailing list, someone posted about this some 
time back; the patch is at https://bugs.busybox.net/show_bug.cgi?id=1339). 
This one is quite deceptive, since it appears that gcc goes ahead with the 
optimisation even though it flags up a warning about it potentially breaking 
things.

Beyond that, you may find some "issues" compiling glibc/eglibc surrounding 
the FORTIFY_SOURCE option.  Have a look at the config file I posted to this 
list some while back, since this may give you some ideas of some settings 
that may work - its available also at 
http://www.cygwin.com/ml/crossgcc/2010-07/msg00006.html.

I hope this gets you started... if you still have problems, let me know and 
I'll try to help further.

Cheers
Andy



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