Re: problem with crosstool 0.28-pre28 supplied patch for gcc 3.3.[23] softfloat on ARM

[Lennert Buytenhek <buytenh at wantstofly dot org>]

On Mon, Aug 16, 2004 at 12:43:01AM +0200, Dimitry Andric wrote:

> > (But that then gives me ICEs when I try to build the compiler with
> > itself, aiiieee.)
> 
> Hmm, I've seen your posts, but never encountered this before.  This
> needs some investigation...

(I'll respond to the rest of your post later.)

Some 24 hours later I think I found why bootstrapping a hardfloat
gcc 3.4 on the ARM target is causing ICEs for me.

If I compile a build=i686-pc-linux-gnu host=i686-pc-linux-gnu 
target=armeb-unknown-linux-gnu toolchain using crosstool 0.28rc32,
using the standard hardfloat configuration, I end up with a toolchain
that has broken float behavior.  Either that, or target kernel FPU
emulation is broken.

On host:
% cat x.c
#include <stdio.h>
#include <stdlib.h>

int main()
{
        float x;

        x = 1.0;
        printf("%f\n", x);

        return 0;
}
% armeb-unknown-linux-gnu-gcc -Wall -o /opt/enp2611_root/tmp/x x.c
% 

On target:
[root@enp2611 tmp]# ./x
0.000000
[root@enp2611 tmp]# 

If I try to print 1.1, I get "-0.000000".
If I try to print 1.2, I get "2.000000".
If I try to print 1.3, I get "-2.000000".

And if I try to print 1.4, I get (hang on)
"26815622249480124604215817416420243243587272560002206992098063765762173090970884294781200568594023450472595307446283091495952708613797907653947046282395648.000000"

Maybe you have an idea off the top of your hat what's going wrong here?


cheers,
Lennert

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