Re: gcc failed to bootstrap on Linux/mipsel

["H . J . Lu" <hjl@lucon.org>]

On Wed, Jan 30, 2002 at 12:36:22AM -0800, Richard Henderson wrote:
> On Wed, Jan 30, 2002 at 12:23:23AM -0800, H . J . Lu wrote:
> > Richarrd, almost every single file in gcc is miscompiled by your change.
> 
> "Different" != "miscompiled".  There were zero functional changes

It is miscompiled.

> in the diff you posted.  The breakage is elsewhere.

Please read

http://gcc.gnu.org/ml/gcc-patches/2002-01/msg02117.html

one more time. The good init_standard_includes has

	.frame  $fp,72,$31 
	...
	move    $fp,$sp
	...
	la      $25,getenv
	jal     $31,$25

But with your change, it becomes

	.frame  $fp,72,$31 
	...
	la      $25,getenv
	jal     $31,$25
	...
	move    $fp,$sp

The o32 assmebler has to turn

	la      $25,getenv
	jal     $31,$25

into
	la      $25,getenv
	jal     $31,$25
	lw      gp,16(frame_register)

That is why it failed at

0x479f34 <init_standard_includes+108>:  lw      gp,16(s8)

since you moved the initialization of s8/fp after "jal". That is a very
bad idea. You have to set the frame register before making any external
calls so that the assembler can restore gp after the function return.
Could you please fix your change?

Thanks.


H.J.