linux-2.3.3 doesn't boot when compiled with egcs-2.93.22

[mark@codesourcery.com]

>>>>> "Martin" == Martin v Loewis <martin@mira.isdn.cs.tu-berlin.de> writes:

    >> The problem is that function drivers/block/ide.c:init_hwif_data
    >> is miscompiled, it gives the value 1 to the noprobe field of
    >> the structure. egcs-1.1.2 gives the correct value 0.

    Martin> This looks like an alias problem to me. 

    Martin> Anyway, I leave this to the aliasing wizards to decide.

Good spotting.  The code is indeed not legal C:

     typedef unsigned short ide_ioreg_t;
     ide_ioreg_t	io_ports[(10) ];	 

So, io_ports is of type `unsigned short ()[10]'.  But,
__constant_memcpy attempts to access it through a pointer to an
unsigned long, as you said.

The only portable way to write memcpy is with `char*'; you can access
anything through a pointer-to-character.  But, to make it fast, you
probably have to write it in assembly code.

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com