Bug while cross compiling for powerpc

[Clément Foucher]

Hi Ryan,

Thank you for your help.

I just tested using your advices, but there are some problems, and I'm not 
sure what to do about that:

First, my PowerPC is a 440, as you guessed (included in Xilinx ml507 
testboard).

So I've retried from scratch, re-downloading glibc and glibc-ports using git 
(since I'm not familiar with git, I haven't understood the 'checkout" step, 
but no matter)

I've added to my command lines the following, as you said:
--enable-add-ons=ports
--with-cpu=440

But then, I have this message:

"Checking sysdep dirs... configure: error; The 440 subspecies of PowerPc is 
not supported"

...

So I tried without the "--with-cpu=440", and hope that will work. But I then 
got the following message:

"'NPTL' -> if you really mean to not use this add-on, run configure again 
using the extra parameter '--disable-sanity-checks'"

Before, I hadn't this message. Is this because of the version I downloaded? 
Of because I added libc-ports?

Anyway, at this point, I don't know what to do... And I'm afraid that, since 
440 is not supported, I can't use that library... But I need it since the 
applications I use on the board requires it...


Any idea?

Thank you.


--------------------------------------------------
From: "Ryan Arnold" <ryan.arnold@gmail.com>
Sent: Thursday, January 14, 2010 5:53 PM
To: <Clement.FOUCHER@unice.fr>; <libc-help@sourceware.org>
Subject: Re: Bug while cross compiling for powerpc

> On Thu, Jan 14, 2010 at 10:21 AM,  <Clement.FOUCHER@unice.fr> wrote:
>> Hi everybody,
>>
>> I'm trying to compile glibc for a powerpc board using eldk configured for
>> powerpc 4XX.
>>
>> I configure glibc using the following:
>>
>> foucher@gentiane:~/Bureau/sources/glibc-build$ 
>> ../glibc-2.9-20090518/configure
>> --prefix=/opt/glibc --build=x86_64-linux --host=powerpc-linux
>>
>
> Firstly to build the 4xx series you should be using the glibc-ports
> add-on since this is an embedded processor, and soft-fp for that
> matter.  Glibc-ports contains the soft-fp code for the 4xx line.
>
> git clone git://sources.redhat.com/git/glibc.git glibc
> git checkout -b glibc_2.11 origin/release/2.11/master
> cd glibc
> git clone git://sources.redhat.com/git/glibc-ports.git ports
> cd ports
> git checkout -b ports_2.11 origin/release/2.11/master
>
> To use ports you need to enable the ports add-on using:
>
> --enable-add-ons=ports
>
> Do you know your 4xx variant?  For the sake of an example I'll use 440.
>
> I believe by default 440 most 4xx variants are default soft-fp.  The
> corresponding hard-fp variants are 440fp.
>
> I suggest that you build using --with-cpu=440.  This will cause gcc to
> build using -mcpu=440.  I don't think using --without-fp is necessary
> in this case but it can't hurt.
>
> If you want the hard-fp variant you can do either -mcpu=440fp or
> -mcpu=440 --with-fp I believe.
>
> Since you're building on x86_64 you'll also want to cross compile so
> that the build doesn't try to use itself:
>
> echo "cross-compiling=yes" >> configparms
>
> Here's how I've been configuring for a non-cross ppc476:
>
> echo "cross-compiling=yes" >> configparms
>
> AUTOCONF=/usr/local/bin/autoconf AS=/opt/toolchain/bin/as
> CC='/opt/toolchain/bin/gcc -m32' CXX='/opt/toolchain/bin/g++ -m32'
> CFLAGS='-O2 -g -mlong-double-128'
> /home/ryanarn/glibc/stage_476_2/glibc/configure --build=powerpc-linux
> --host=powerpc-linux --target=powerpc-linux --prefix=/ --exec-prefix=/
> --libdir=/lib --libexecdir=/usr/lib --infodir=/usr/share/info
> --mandir=/usr/share/man --datadir=/usr/share
> --with-headers=/opt/at05/include --with-tls --without-fp
> --with-__thread --enable-shared --enable-kernel=2.6.16 --without-cvs
> --with-cpu=476 --enable-add-ons=ports,nptl
>
> I hope this helps.
>
> Ryan S. Arnold
> IBM Linux Technology Center
> (powerpc libc-ports maintainer)