Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option

[Martin J. Bligh]

>>>> Its probably appropriate to drop gcc 2.x support at that point too since
>>>> it's the major cause of remaining problems
>>> 
>>> 
>>> What problems does it cause? 2.95.4 still seems to work fine for me.
>> 
>> 
>> The latest gcc2 on the ftp.gnu.org site is gcc 2.95.3. There is 
>> officially no such thing as "gcc 2.95.4". Probably you are talking about 
>> a patched version of some gcc2 cvs snapshot - that's what distros 
>> provide. Please specify exactly what gcc version you are talking about.
> 
> 2.95.4, if I remember correctly, contained fixes that went onto the gcc 2.95 branch after 2.95.3 was released. Some of the fixes were for Linux-2.2/2.4 and glibc2.2 compatibility. This compiler was distributed by Debian, I think.
> 
>> 
>> And there _is_ problem with gcc-2.95.3-compiled kernel: latest cvs glibc 
>> testsuite segfaults in nptl tests. There are no failures with the kernel 
>> identically configured, but compiled with gcc 3.3.4 or 3.4.1. So gcc 
>> 2.95.3 as supplied by gnu.org miscompiles the kernel (futexes?). Either 
>> fix the kernel or drop gcc2 support.

If 2.95.3 is broken, then drop that. Before dropping gcc2 support entirely,
you should prove all versions are broken.

And yes, the 2.95.4 I've been using happily for about 4 years is Debian.
Not only does it compile about twice as quickly, it produces better code
than anything else I've tested (though 3.x is finally getting close).

M.

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