Re: [arm-gnu] Static linking problem with Cortex-A8 on 2008q1-126

[Carlos O'Donell <carlos@xxxxxxxxxxxxxxxx>]

Laurent Desnogues wrote:
> #include <stdio.h>
>
> int main(void)
> {
>   printf("%s\n", "0");
>
>   return 0;
> }
>
> Using these two command-lines:
>
> arm-none-linux-gnueabi-gcc -static -O0 -mcpu=cortex-a8 string.c -o string-O0
> arm-none-linux-gnueabi-gcc -static -O1 -mcpu=cortex-a8 string.c -o string-O1
> In string-O1:
>
> 00008210 <main>:
>     8210:       e92d4010        push    {r4, lr}
>     8214:       e3040080        movw    r0, #16512      ; 0x4080
>     8218:       e3400000        movt    r0, #0  ; 0x0
>     821c:       eb0003cf        bl      9160 <_IO_puts>
>     8220:       e3a00000        mov     r0, #0  ; 0x0
>     8224:       e8bd8010        pop     {r4, pc}
>   [ 6] .rodata           PROGBITS        000622b0 05a2b0 013988 00   A  0   0  8
>
> It looks like the "0" string is not correctly relocated with -O1.
>
> Am I doing something utterly stupid or is there a bug somewhere?

I can reproduce this issue on 2008q1-126.

This is most likely a bug in the MOVT/MOVT relocation. There was at 
least one fix relating to MOVW/MOVT relocation processing in and around 
the time of the 2008q1-126 release.

The issue does not appear in Sourcery G++ for ARM GNU/Linux 4.2-173.

There is no easy workaround for this issue. Mark might have an idea though.

Cheers,
Carlos.
--
Carlos O'Donell
CodeSourcery
carlos@xxxxxxxxxxxxxxxx
(650) 331-3385 x716