Testsuite failure ?

[Manfred Hollstein]

On Friday, 25 August 2000, 15:37:09 -0400, ronis@onsager.chem.mcgill.ca wrote:

> 
> Jeffrey A. Law replied:
> 
> 	malign-double CHANGES THE ABI.
> 	
> 	This means that if you use it, you have to make sure everything is 
> compiled
> 	with that flag.  Otherwise bad things will happen.  Depending on the 
> code
> 	you write, it might go unnoticed for weeks, months or even years, but
> 	eventually you'll get nailed.
> 	
> 	And when we say everything, we mean it.  It includes glibc, every 
> library,
> 	and every application.
> 	
> 	-malign-double is evil.  Do not use it.
> 
> I think I understand.  However, I may have added this flag when I built libc
> [I do to everything else].  Also:
> 
> 1) I thought alignment was a big performace win on 686's?

Yeah, but I believe, current versions of the tools (gcc/g++ and binutils)
are much smarter in figuring out what is most appropriate.

> 
> 2) What about the other -malign- ix86 options?  For example, the default ix86 
> makefile used to build the linux kernel has loads of these.

Well, there's still the recommendation to use gcc-2.7.2.3 for building
the v2.0/v2.2 Linux kernels. And, gcc-2.7.2.3 wasn't smart enough to figure
out what I described above.

> 
> David
> 
> 
> 

Cheers.

l8er
manfred