cross compiler

cross compiler

[Tudor Hulubei]

Hi,

Is it possible to compile egcs on Linux/x86 as a cross compiler for
the OSF4.0/Alpha?  I remember reading in the gcc docs a while ago that 
it wasn't possible (or very hard to do!?) due to 32bit/64bit issues.

Thanks,
Tudor

Re: cross compiler

[Jeffrey A Law]

  In message < 199802121721.MAA17816@hal2.dyn.ml.org >you write:
  > Is it possible to compile egcs on Linux/x86 as a cross compiler for
  > the OSF4.0/Alpha?  I remember reading in the gcc docs a while ago that 
  > it wasn't possible (or very hard to do!?) due to 32bit/64bit issues.
It ought to work.  For the most part the code should handle the 32/64
bit issues fine.  I regularly build cross compilers for 64bit mips targets
for example.

jeff

Adding New Registers

[Hasdi R Hashim]

Hello guys,

	I am in the middle of adding new special purpose registers to an
existing target architecture. It should be able to accept 8-byte
structure. I added a new register class and a new constraint characters,
'x'. I only accepts BLKmode but at this point it can accept any mode. I
modified the config/arch/arch.[ch] files but when assembling....

	struct { int x,y } blk1,blk2;
	asm("%0,%1" : "=x" (blk1) : "x" (blk1), "x" blk2);

...xgcc spits the following:

	../x.c: In function `xmain':
	../x.c:7: `asm' operand requires impossible reload

I can replace blk1/blk2 with "0" or "0.0" and get the same stuff.
Any ideas what I missed? TQ.

Hasdi

Re: Adding New Registers

[Richard Henderson]

On Fri, Feb 13, 1998 at 11:54:26AM +0000, Hasdi R Hashim wrote:
> 	I am in the middle of adding new special purpose registers to an
> existing target architecture. It should be able to accept 8-byte
> structure. I added a new register class and a new constraint characters,
> 'x'. I only accepts BLKmode but at this point it can accept any mode
[...]
> 	../x.c: In function `xmain':
> 	../x.c:7: `asm' operand requires impossible reload

I didn't think that BLKmode was a reasonable thing to put on a 
register...  You might try accepting DImode or CSImode or whatnot
instead.


r~

Re: Adding New Registers

[Jeffrey A Law]

  In message < 19980213152758.41081@dot.cygnus.com >you write:
  > On Fri, Feb 13, 1998 at 11:54:26AM +0000, Hasdi R Hashim wrote:
  > > 	I am in the middle of adding new special purpose registers to an
  > > existing target architecture. It should be able to accept 8-byte
  > > structure. I added a new register class and a new constraint characters,
  > > 'x'. I only accepts BLKmode but at this point it can accept any mode
  > [...]
  > > 	../x.c: In function `xmain':
  > > 	../x.c:7: `asm' operand requires impossible reload
  > 
  > I didn't think that BLKmode was a reasonable thing to put on a 
  > register...  You might try accepting DImode or CSImode or whatnot
  > instead.
Correct.  BLKmode registers are a no-no.

jeff

Re: cross compiler

[H.J. Lu]

> 
> 
>   In message < 199802121721.MAA17816@hal2.dyn.ml.org >you write:
>   > Is it possible to compile egcs on Linux/x86 as a cross compiler for
>   > the OSF4.0/Alpha?  I remember reading in the gcc docs a while ago that 
>   > it wasn't possible (or very hard to do!?) due to 32bit/64bit issues.
> It ought to work.  For the most part the code should handle the 32/64
> bit issues fine.  I regularly build cross compilers for 64bit mips targets
> for example.
> 

I tried a few months ago. It didn't work since the alpha backend
assumed too much about 64 bit host. I am not sure it has changed.

-- 
H.J. Lu (hjl@gnu.org)

Re: cross compiler

[Jeffrey A Law]

  In message < m0y3NUb-0004eeC@ocean.lucon.org >you write:
  > > bit issues fine.  I regularly build cross compilers for 64bit mips target
  > > for example.
  > > 
  > 
  > I tried a few months ago. It didn't work since the alpha backend
  > assumed too much about 64 bit host. I am not sure it has changed.
Ah, yes, if the backend has such assumptions, then it's not going
to work.

Maybe I should have said the machine independent code is capable of
32x64 cross compiles.

Thanks for clarifying things.

jeff

Re: cross compiler

[Richard Henderson]

On Fri, Feb 13, 1998 at 07:57:33AM -0800, H.J. Lu wrote:
> I tried a few months ago. It didn't work since the alpha backend
> assumed too much about 64 bit host. I am not sure it has changed.

Several of these problems have been fixed, since NT is 32-bit
on Alpha, and I've had an actual user providing feedback. :-)


r~